SMD code TT 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.
7 parts in SOT-23 are printed TT
Not sure which one you have?
Answer up to 4 quick questions and these 22 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SA1036KGPSOT-23PNP transistor, 3 pins, ChenmkoPNP transistor3 pinsChenmko
- What it is
- PNP transistor
- Maker
- Chenmko
- Package
- SOT-23
- Pins
- 3
- Details
- Medium Power PNP Transistor, 32 V, 0.5 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
2SA1036KGP-QSOT-23PNP transistor, 3 pins, Chenmko EnterprisePNP transistor3 pinsChenmko Enterprise
- What it is
- PNP transistor
- Maker
- Chenmko Enterprise
- Package
- SOT-23
- Pins
- 3
- Details
- PNP transistor: AF, Sw, 40V, 500mA, 300mW, B=120..270, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1036KPTSOT-23PNP transistor, 3 pinsPNP transistor3 pinsNot recorded
- What it is
- PNP transistor
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1530A-TSOT-233 pins, PanNot recorded3 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: AF, 60V, 150mA, 200mW, B=360..700, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC2406SOT-23NPN transistor, 3 pins, PanasonicNPN transistor3 pinsPanasonic
- What it is
- NPN transistor
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2406-TSOT-233 pins, PanNot recorded3 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: AF, LN, 55V, 10mA, 200mW, B=360..700, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5437FBSOT-233 pins, RenesasNot recorded3 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Details
- npn RF fT 9.5GHz 9V 50mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
8 more parts have no package on record. Nothing rules them out, so they stay.
NC7S32L6Logic gate, onsemiLogic gateNot recordedonsemi
- What it is
- Logic gate
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TinyLogic HS 2-Input OR Gate
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
2SC5437NPN transistor, RenesasNPN transistorNot recordedRenesas
- What it is
- NPN transistor
- Maker
- Renesas
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
74LVC1T45FX4Diodes IncorporatedNot recordedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating transceiver with 3-state output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD45471GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,7V, -Reset Open drain output, 100ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127C44HNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.4V±0.8%, +Reset PPO, -MR, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LT4ME8.5CATVS diode, Lite-On SemiconductorTVS diodeNot recordedLite-On Semiconductor
- What it is
- TVS diode
- Maker
- Lite-On Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=8.5V, Vbr=9.44..10.43V, Ipp=27.7A, 400W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
NC7S32LonsemiNot recordedNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input OR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SM4T200ASGS-Thomson MicroelectronicsNot recordedNot recordedSGS-Thomson Microelectronics
- What it is
- Not recorded
- Maker
- SGS-Thomson Microelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TVS: 200V, 1,5A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
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.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black 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.
This part
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.
NPN transistor
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.
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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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 TT
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 2 more parts.
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