SMD code search: identify a part by its marking

No part printed L22 is recorded in SOIC-8

Not sure which one you have?

Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.

5 parts have no package on record. Nothing rules them out, so they stay.

Schottky diode. What differs:

SK220LHTSeCoSSeCoS
What it is
Schottky diode
Maker
SeCoS
Package
Not recorded
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SK220LHT, opens in a new tab
SL22-MHFormosa MicrosemiFormosa Microsemi
What it is
Schottky diode
Maker
Formosa Microsemi
Package
Not recorded
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SL22-MH, opens in a new tab
SL22-MHTFormosa MicrosemiFormosa Microsemi
What it is
Schottky diode
Maker
Formosa Microsemi
Package
Not recorded
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SL22-MHT, opens in a new tab
SL22-MSFormosa MicrosemiFormosa Microsemi
What it is
Schottky diode
Maker
Formosa Microsemi
Package
Not recorded
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SL22-MS, opens in a new tab
SL22-MSTFormosa MicrosemiFormosa Microsemi
What it is
Schottky diode
Maker
Formosa Microsemi
Package
Not recorded
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SL22-MST, opens in a new tab

19 more parts are printed with a code easy to misread as L22: none in SOIC-8, 19 with no package on record

Printed with a code easy to misread

One character differs, and it is one that is easy to confuse under a lamp. The odd one out is marked on each.

19 parts have no package on record. Nothing rules them out, so they stay.

KIC7122T5printed 122Voltage supervisor, KECVoltage supervisorKEC
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
KEC
Package
Not recorded
Pins
Not recorded
Details
CMOS voltage detector, 2.2 V detection
Source
Manufacturer datasheet
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor KIC7122T5, opens in a new tab
1PMT4122printed 122Zener diode, Microsemi Integrated Products DivisionZener diodeMicrosemi Integrated Products Division
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Microsemi Integrated Products Division
Package
Not recorded
Pins
Not recorded
Details
Zener diode: 36V±5%, Izt=24.0mA, 1W
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
015A12Zprinted 12ZZener diode, ToshibaZener diodeToshiba
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Toshiba
Package
Not recorded
Pins
Not recorded
Details
Zener diode: 12.06..12.60V, Iz=5mA, Zz=15, 200mW
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
015AZ12Zprinted 12ZZener diode, ToshibaZener diodeToshiba
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Toshiba
Package
Not recorded
Pins
Not recorded
Details
Zener diode: 12.06..12.60V, Iz=5mA, Zz=15, 200mW
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
BZD2C120Pprinted 12ZZener diode, Fagor ElectronicaZener diodeFagor Electronica
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Fagor Electronica
Package
Not recorded
Pins
Not recorded
Details
Zener diode: 120V±5%, Izt=4mA, 1W
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
EC311122C4Rprinted 122LDO regulator, E-CMOSLDO regulatorE-CMOS
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
E-CMOS
Package
Not recorded
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, 2.2V±2%, 300mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
HZM12NB2printed 122Zener diode, RenesasZener diodeRenesas
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Renesas
Package
Not recorded
Pins
Not recorded
Details
Z-diode: 11.74..12.24V, 200mW
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
HZU12A2Lprinted 122Zener diode, RenesasZener diodeRenesas
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Zener diode
Maker
Renesas
Package
Not recorded
Pins
Not recorded
Details
Zener diode: 11.9..12.4V, Izt=0.5mA, Zzt=80, 150mW
Source
Published code list
Is it dead?
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
HZU12LA2printed 122RenesasNot recordedRenesas
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Renesas
Package
Not recorded
Pins
Not recorded
Details
Z-diode: 11.9..12.4V, 150mW
Source
Published code list
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways: failed open.
A reading the wrong way round as well: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
IXD1415AA227R-Gprinted 122LDO regulator, IXYSLDO regulatorIXYS
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.80/3.00V±1%, 200mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
MAZM120Hprinted 12ZPanNot recordedPan
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Pan
Package
Not recorded
Pins
Not recorded
Details
SA-Diode: Quad, 12V, 5mA, 150mW
Source
Published code list
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways: failed open.
A reading the wrong way round as well: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
MAZT120Hprinted 12ZPanNot recordedPan
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Pan
Package
Not recorded
Pins
Not recorded
Details
SA-Diode: 2x 12V, 5mA, 150mW
Source
Published code list
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways: failed open.
A reading the wrong way round as well: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
MAZZ120Hprinted 12ZPanNot recordedPan
Printed 12Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Pan
Package
Not recorded
Pins
Not recorded
Details
SA-Diode: Quad, 12V, 5mA, 200mW
Source
Published code list
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
Dead, it reads
The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways: failed open.
A reading the wrong way round as well: leaky.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XC6129N53C7R-Gprinted L2ZVoltage supervisor, TorexVoltage supervisorTorex
Printed L2Z on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
Torex
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 5.3V±0.8%, -Reset ODO, Det. Delay
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XC6219D301MRprinted LZZLDO regulator, TorexLDO regulatorTorex
Printed LZZ on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Torex
Package
Not recorded
Pins
Not recorded
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XC6219D301PRprinted LZZLDO regulator, TorexLDO regulatorTorex
Printed LZZ on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Torex
Package
Not recorded
Pins
Not recorded
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XC6415AA227R-Gprinted 122LDO regulator, TorexLDO regulatorTorex
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Torex
Package
Not recorded
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.80/3.00V±1%, 200mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XC6423AB221R-Gprinted 122LDO regulator, TorexLDO regulatorTorex
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Torex
Package
Not recorded
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=2.50/2.85V±1%, 300mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
XCL101A221BR-Gprinted 122DC-DC converter, TorexDC-DC converterTorex
Printed 122 on the part. Easy to misread as L22. Check that character with a loupe before you order anything.
What it is
DC-DC converter
Maker
Torex
Package
Not recorded
Pins
Not recorded
Details
DC/DC voltage converter IC: PFM st-up, 1.2MHz, 2.2V±2%, 100mA, +CE
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

126 more parts have codes that begin with L22: 11 in SOIC-8, 115 with no package on record

Codes that begin with L22

For a marking with its end worn or burnt off. Each one shows its full printed code.

LT1220CS8printed 1220SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1220. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1220CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1221CS8printed 1221SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1221. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1221CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1222CS8printed 1222SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1222. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1222CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1222IS8printed 1222ISOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1222I. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1223CS8printed 1223SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1223. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1223CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1224CS8printed 1224SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1224. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1224CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1225CS8printed 1225SOIC-8LinearNot recordedLinear
Printed 1225. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Linear
Package
SOIC-8
Pins
8
Details
equivalent LT1225CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1226CS8printed 1226SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1226. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1226CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1227CS8printed 1227SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1227. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1227CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1228CS8printed 1228SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1228. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1228CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LT1229CS8printed 1229SOIC-8Analog DevicesNot recordedAnalog Devices
Printed 1229. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Not recorded
Maker
Analog Devices
Package
SOIC-8
Pins
8
Details
equivalent LT1229CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
15 more parts have no package on record. Nothing rules them out, so they stay.
- XCL223A0L3D2-Gprinted L223ALDC-DC converter, TorexDC-DC converterTorex
  Printed L223AL. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 0.85V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A0M3D2-Gprinted L223AMDC-DC converter, TorexDC-DC converterTorex
  Printed L223AM. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 0.95V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1A3D2-Gprinted L223BADC-DC converter, TorexDC-DC converterTorex
  Printed L223BA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.05V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1B3D2-Gprinted L223BBDC-DC converter, TorexDC-DC converterTorex
  Printed L223BB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.15V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1C3D2-Gprinted L223BCDC-DC converter, TorexDC-DC converterTorex
  Printed L223BC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.25V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1D3D2-Gprinted L223BDDC-DC converter, TorexDC-DC converterTorex
  Printed L223BD. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.35V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1E3D2-Gprinted L223BEDC-DC converter, TorexDC-DC converterTorex
  Printed L223BE. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.45V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1F3D2-Gprinted L223BFDC-DC converter, TorexDC-DC converterTorex
  Printed L223BF. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.55V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1H3D2-Gprinted L223BHDC-DC converter, TorexDC-DC converterTorex
  Printed L223BH. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.65V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1K3D2-Gprinted L223BKDC-DC converter, TorexDC-DC converterTorex
  Printed L223BK. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.75V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1L3D2-Gprinted L223BLDC-DC converter, TorexDC-DC converterTorex
  Printed L223BL. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.85V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A1M3D2-Gprinted L223BMDC-DC converter, TorexDC-DC converterTorex
  Printed L223BM. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 1.95V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A2A3D2-Gprinted L223CADC-DC converter, TorexDC-DC converterTorex
  Printed L223CA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 2.05V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A2B3D2-Gprinted L223CBDC-DC converter, TorexDC-DC converterTorex
  Printed L223CB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 2.15V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XCL223A2C3D2-Gprinted L223CCDC-DC converter, TorexDC-DC converterTorex
  Printed L223CC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM st-dwn, 2.25V±2%, 700mA, 3MHz, +CE
  Source
  Published code list
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

100 more parts are not listed here. Type more of the code to narrow the list.

Did you find your part?

Try Tech free for 30 days. You need a card to start. Unless you cancel during the trial, Tech then costs €12.00 a month plus VAT. See the plans

One code, several parts

Marking codes are not unique. In the standard code book, 6H on a SOT-23 is an NPN transistor, a varicap, an N-channel JFET, two digital transistors, a 3.6 V voltage detector: six parts from five makers. So a search on WhatSMD (What SMD) shows the parts we hold under that code and under codes easily misread as it, with only the columns that tell them apart.

6Hon a SOT-23, in the code book

NPN transistor
Varicap
N-channel JFET
Digital transistor ×2
3.6 V voltage detector

When more than one is left

Tap Help me choose. Up to 4 quick answers: whether the part has failed, then what separates the parts left. Those get ranked with the reasoning and a test that settles it. That uses one identification: 2 a month are free without an account, and 3 with a free account.

When you cannot read it

Tap the camera in the field. We read the characters, keep the ones we are unsure of, and search every reading. A photo too soft to read is turned back on your phone first; if it is the only one you can get, you can still send it.

Get the app

The same search on your phone, and a camera with a light, zoom and tap to focus for a marking you cannot read. Sign in with your email address to use the same account.

Coming soon to the App Store

SMD code search: identify a part by its marking

What’s printed on it?

No part printed L22 is recorded in SOIC-8

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Printed with a code easy to misread

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Codes that begin with L22

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Is it dead?

Did you find your part?

One code, several parts

When more than one is left

When you cannot read it

Get the app