SMD code search: identify a part by its marking

11N on a chip capacitor

11 nF

11 nF capacitor

The n is both the decimal point and the unit: 11 nF.

Check it with a meter

Lift one end and measure it on a capacitance range. A good one reads close to 11 nF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. A failed one usually reads near 0 Ω, or a steady low resistance, on the ohms range, often from a crack. On the board a shorted capacitor shorts its whole rail. A failed reading does not change what to fit: the marking still says 11 nF.

On a transistor or diode body (WSON, SOT-23-5, SOT-223), 11N is a part code instead. Those parts are listed below.

Not sure which one you have?

Answer up to 4 quick questions and these 19 parts are ranked, with a meter test that settles it. It works on a dead part too.

The only part printed 11N in our tables

XC6102A221MR

What it is: Voltage supervisor
Maker: Torex
Package: SOT-23-5
Pins: 5
Details: CMOS-IC: VDet 2.1V, 5%, Hst, -MR, -Reset ODO, Wt=50ms, Rt=3.13ms
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.

Was it this one?

Printed with a code easy to misread

These parts are printed with a character that is easy to misread as what you typed. The odd one out is marked on each.

2SC4103-Nprinted 1LNSOT-323NPN transistor, 3 pins, ROHMNPN transistorSOT-3233 pinsROHM
Printed 1LN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
NPN transistor
Maker
ROHM
Package
SOT-323
Pins
3
Details
Si-npn: GP, 30V, 30mA, 200mW, B=56..120, >110MHz
Source
Published code list
Is it dead?
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
Only one junction reads, or none: a junction has failed open. It then looks like a diode.
A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LD6918GDAW-1Nprinted I1NWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed I1N on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.85V/2.1V±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.
LD6918GDAW-INprinted IINWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed IIN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.6V/2.1V±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.
LD6918GDAW-LNprinted ILNWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed ILN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.9V/2.1V±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.
LD6918GDDW-1Nprinted I1NWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed I1N on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.85V/2.1V±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.
LD6918GDDW-INprinted IINWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed IIN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.6V/2.1V±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.
LD6918GDDW-LNprinted ILNWSONLDO regulator, LeadtrendLDO regulatorWSONNot recordedLeadtrend
Printed ILN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Leadtrend
Package
WSON
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.9V/2.1V±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.
LD6991AGU-1621printed LINSOT-3636 pins, LeadtrendNot recordedSOT-3636 pinsLeadtrend
Printed LIN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Leadtrend
Package
SOT-363
Pins
6
Details
Linear voltage regulator with volatge detector: LDO, 1.6V±2%, 90mA, Vdet=2.1V±2%, +Reset ODO
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.
LD6991AGU-1921printed LLNSOT-3636 pins, LeadtrendNot recordedSOT-3636 pinsLeadtrend
Printed LLN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Leadtrend
Package
SOT-363
Pins
6
Details
Linear voltage regulator with volatge detector: LDO, 1.9V±2%, 90mA, Vdet=2.1V±2%, +Reset ODO
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.
S-1313A20-M5T1U3printed 1LNSOT-23-55 pins, ABLICNot recordedSOT-23-55 pinsABLIC
Printed 1LN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
ABLIC
Package
SOT-23-5
Pins
5
Details
equivalent [2.0V LDO]
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.
S-1313A20-N4T1U3printed 1LNSOT-3434 pins, ABLICNot recordedSOT-3434 pinsABLIC
Printed 1LN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
ABLIC
Package
SOT-343
Pins
4
Details
equivalent [2.0V LDO]
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.
XC6102D521MRprinted 1LNSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
Printed 1LN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
Torex
Package
SOT-23-5
Pins
5
Details
CMOS-IC: VDet 2.1V, 5%, Hst, -MR, -Reset ODO, Wt=400ms, Rt=100ms
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.
6 more parts have no package on record
- INA186A5IYFDprinted 1INCurrent sense amplifier, 6 pins, Texas InstrumentsCurrent sense amplifierNot recorded6 pinsTexas Instruments
  Printed 1IN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
  What it is
  Current sense amplifier
  Maker
  Texas Instruments
  Package
  Not recorded
  Pins
  6
  Details
  Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Current-Sense Amplifier With Enable
  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 INA186A5IYFD, opens in a new tab
- SGM2084-ADJQTGC6Gprinted 1INLDO regulator, 6 pins, SG MicroLDO regulatorNot recorded6 pinsSG Micro
  Printed 1IN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  SG Micro
  Package
  Not recorded
  Pins
  6
  Details
  Automotive 1A, Fast Transient Response, Noise and High Accuracy LDO with Power-Good
  Source
  Manufacturer datasheet
  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.
  Datasheetfor SGM2084-ADJQTGC6G, opens in a new tab
- ADP162AUJZ-1.8-R7printed LLN5 pins, Analog DevicesNot recordedNot recorded5 pinsAnalog Devices
  Printed LLN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
  What it is
  Not recorded
  Maker
  Analog Devices
  Package
  Not recorded
  Pins
  5
  Details
  equivalent [1.8V LDO]
  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.
- S-1313A20-A4T1U3printed 1LN4 pins, ABLICNot recordedNot recorded4 pinsABLIC
  Printed 1LN on the part. Easy to misread as 11N. Check that character with a loupe before you order anything.
  What it is
  Not recorded
  Maker
  ABLIC
  Package
  Not recorded
  Pins
  4
  Details
  equivalent [2.0V LDO]
  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.
- XC6129N35B7R-Gprinted L1NVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
  Printed L1N on the part. Easy to misread as 11N. 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: 3.5V±0.8%, -Reset ODO, Rel. Delay, Undef. Prot.
  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.
- XC6129N36G7R-Gprinted LLNVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
  Printed LLN on the part. Easy to misread as 11N. 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: 3.6V±0.8%, +Reset ODO, Rel. 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.

7 more parts have codes that begin with 11N

Codes that begin with 11N

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

STF11NM50Nprinted 11NM50NTO-220FN-channel MOSFET, STMicroelectronicsN-channel MOSFETTO-220FNot recordedSTMicroelectronics
Printed 11NM50N. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
N-channel MOSFET
Maker
STMicroelectronics
Package
TO-220F
Pins
Not recorded
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor STF11NM50N, opens in a new tab
SPB11N60S5printed 11N60S5D2PAK3 pins, InfineonNot recordedD2PAK3 pinsInfineon
Printed 11N60S5. 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
Infineon
Package
D2PAK
Pins
3
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.
GSFL1N60printed L1N60SOT-223N-channel MOSFET, 4 pins, Good-ArkN-channel MOSFETSOT-2234 pinsGood-Ark
Printed L1N60. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
N-channel MOSFET
Maker
Good-Ark
Package
SOT-223
Pins
4
Details
N-channel MOSFET, 600 V
Source
Manufacturer datasheet
Is it dead?
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor GSFL1N60, opens in a new tab
TPS7A0518PDBVprinted 1INFSOT-23-5LDO regulator, 5 pins, Texas InstrumentsLDO regulatorSOT-23-55 pinsTexas Instruments
Printed 1INF. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
LDO regulator
Maker
Texas Instruments
Package
SOT-23-5
Pins
5
Details
1-µA Ultralow IQ, 200-mA, Low-Dropout Regulator in a Small-Size Package
Source
Manufacturer datasheet
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.
Datasheetfor TPS7A0518PDBV, opens in a new tab
SM74501MP-5.0printed LLNBSOT-223LDO regulator, National SemiconductorLDO regulatorSOT-223Not recordedNational Semiconductor
Printed LLNB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
LDO regulator
Maker
National Semiconductor
Package
SOT-223
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, 5.0V±2%, 250mA
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.
2 more parts have no package on record
- STL11N3LLH6printed 11N3LN-channel MOSFET, STMicroelectronicsN-channel MOSFETNot recordedNot recordedSTMicroelectronics
  Printed 11N3L. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  N-channel MOSFET
  Maker
  STMicroelectronics
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, part lifted. Test drain to source first, then short gate to source and test again.
  Working, it reads
  Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
  Dead, it reads
  Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
  The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
  No body diode at all: failed open.
  On the board
  the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
  Compare:
  If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
  Watch for:
  The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
  Datasheetfor STL11N3LLH6, opens in a new tab
- STL11N65M5printed 11N65M5N-channel MOSFET, STMicroelectronicsN-channel MOSFETNot recordedNot recordedSTMicroelectronics
  Printed 11N65M5. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  N-channel MOSFET
  Maker
  STMicroelectronics
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, part lifted. Test drain to source first, then short gate to source and test again.
  Working, it reads
  Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
  Dead, it reads
  Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
  The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
  No body diode at all: failed open.
  On the board
  the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
  Compare:
  If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
  Watch for:
  The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
  Datasheetfor STL11N65M5, opens in a new tab

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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

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11 nF

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XC6102A221MR

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Printed with a code easy to misread

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Codes that begin with 11N

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One code, several parts

When more than one is left

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