SMD code 9L in SOT-323

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.

1 part in SOT-323 is printed 9L

Not sure which one you have?

Answer up to 4 quick questions and these 13 parts are ranked, with a meter test that settles it. It works on a dead part too.

BZB784-C15SOT-3233 pins, NXPNot recorded3 pinsNXP
What it is
Not recorded
Maker
NXP
Package
SOT-323
Pins
3
Details
Z-diode: Dual, 15V±5%, Zzt=10Ω, 350mW
Source
Published code list
Is it dead? The meter test is below: Silicon diode.
12 more parts have no package on record. Nothing rules them out, so they stay.
- DW52C15VZener diode, SeCoSZener diodeNot recordedSeCoS
  What it is
  Zener diode
  Maker
  SeCoS
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: Zener diode.
  Datasheetfor DW52C15V, opens in a new tab
- BZB984-C15Zener diode, PhilipsZener diodeNot recordedPhilips
  What it is
  Zener diode
  Maker
  Philips
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Zener diode: Dual, 15V±5%, If=200mA, 265mW
  Source
  Published code list
  Is it dead? The meter test is below: Zener diode.
- BZT52C15LPZener diode, Diodes IncorporatedZener diodeNot recordedDiodes Incorporated
  What it is
  Zener diode
  Maker
  Diodes Incorporated
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Zener diode: 13.8..15.6V, Izt=5mA, Zzt=30, 250mW
  Source
  Published code list
  Is it dead? The meter test is below: Zener diode.
- IXD5127C31ENRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.1V±0.8%, -Reset PPO, -MR, 800ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127N31KNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.1V±0.8%, +Reset ODO, -MR, 800ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- R1161D291DNisshinbo Micro DevicesNot recordedNot recordedNisshinbo Micro Devices
  What it is
  Not recorded
  Maker
  Nisshinbo Micro Devices
  Package
  Not recorded
  Pins
  Not recorded
  Details
  VR-IC: LDO, CE, auto discharge, 2.9V±2%, 350mA
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- XC6127C31ENRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.1V±0.8%, -Reset PPO, -MR, Rdt=800ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6127N31KNRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.1V±0.8%, +Reset ODO, -MR, Rdt=800ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6221A191NRLDO regulator, TorexLDO regulatorNot recordedTorex
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 1.9V±20mV, 200mA, +CE
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- XC6221A1917RLDO regulator, TorexLDO regulatorNot recordedTorex
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 1.9V±20mV, 200mA, +CE
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- XC6223B28B9R-GLDO regulator, TorexLDO regulatorNot recordedTorex
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 2.85V±1%, 300mA, +CE, CL
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- XC6223B28BNR-GLDO regulator, TorexLDO regulatorNot recordedTorex
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 2.85V±1%, 300mA, +CE, CL
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.

Is it dead? One meter test per kind

Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.

Silicon diode

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.

Zener diode

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.

Integrated circuit

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.

Voltage regulator

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.

Printed with a code easy to misread as 9L

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes that begin with 9L

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 87 more parts.

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