SMD code N29 in SOT-23
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.
5 parts in SOT-23 are printed N29
Not sure which one you have?
Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.
82N29-AE3-5SOT-23Voltage supervisor, UnisonicVoltage supervisorUnisonic
- What it is
- Voltage supervisor
- Maker
- Unisonic
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.9V±2% -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BFR540SOT-23RF transistor, PhiRF transistorPhi
- What it is
- RF transistor
- Maker
- Phi
- Package
- SOT-23
- Pins
- 3
- Details
- NPN 9 GHz wideband transistor
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
DDTC115GCASOT-23Digital transistor (NPN, resistors built in), Diodes IncorporatedDigital transistor (NPN, resistors built in)Diodes Incorporated
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- dtr npn 50V 0.1A R2 100k 0.2W
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
DDTC115GKASOT-23Digital transistor (NPN, resistors built in), Diodes IncorporatedDigital transistor (NPN, resistors built in)Diodes Incorporated
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- dtr npn 50V 0.1A R2 100k 0.2W
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
LDTC115GLT1GSOT-23Digital transistor (NPN, resistors built in), LRCDigital transistor (NPN, resistors built in)LRC
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor: Sw., 50V, 100mA, B>68, R2=100k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
3 more parts have no package on record. Nothing rules them out, so they stay.
LDTC115GET1GDigital transistor (NPN, resistors built in), LRCDigital transistor (NPN, resistors built in)LRC
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: Sw., 50V, 100mA, B>68, R2=100k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
S72N29SFAUK SemiconductorNot recordedAUK Semiconductor
- What it is
- Not recorded
- Maker
- AUK Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Lin/Digi-IC: Voltage Detector 2,9V, Reset Open collector output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
S72N29UFAUK SemiconductorNot recordedAUK Semiconductor
- What it is
- Not recorded
- Maker
- AUK Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Lin/Digi-IC: Voltage Detector 2,9V, Reset Open collector output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour 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.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Codes that begin with N29
For a marking with its end worn or burnt off. Each code has a page of its own.
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