SMD code ATs
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and AT was searched.
199 parts are printed ATs
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SC4066SOT-23NPN transistor, 3 pins, Sanyo ElectricNPN transistorSOT-233 pinsSanyo Electric
- What it is
- NPN transistor
- Maker
- Sanyo Electric
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor: AF, GP, 50V, 100mA, 200mW, B>80, 250MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4326K-SSOT-23NPN transistor, 3 pins, ROHMNPN transistorSOT-233 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: HF, 12V, 50mA, 150mW, B=270..560, >800MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SD1470SOT-89Darlington transistor, 3 pins, RenesasDarlington transistorSOT-893 pinsRenesas
- What it is
- Darlington transistor
- Maker
- Renesas
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn-Darl: GP, 60V, 1A, B=2k..100k
- Source
- Published code list
Is it dead? The meter test is below: Darlington transistor.
6.0SMAJ8.5CASMATVS diode, 2 pins, UN SemiconductorTVS diodeSMA2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=8.5V, Vbr=9.44..10.40V, Ipp=41.7A, 600W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
74AUP1G175GWSOT-3636 pins, NXPNot recordedSOT-3636 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-363
- Pins
- 6
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop with reset
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ADM810TARTSOT-23Voltage supervisor, 3 pins, Analog DevicesVoltage supervisorSOT-233 pinsAnalog Devices
- What it is
- Voltage supervisor
- Maker
- Analog Devices
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.08V±1.5%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AME8500AEETAE46SOT-23Voltage supervisor, 3 pins, AMEVoltage supervisorSOT-233 pinsAME
- What it is
- Voltage supervisor
- Maker
- AME
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 4.63V, -Reset Push-pull output, 150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AME8500AEETAE46ZSOT-23Voltage supervisor, 3 pins, AMEVoltage supervisorSOT-233 pinsAME
- What it is
- Voltage supervisor
- Maker
- AME
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 4.63V, -Reset Push-pull output, 150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
7 more parts have no package on record
74AUP1G175GFNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop with reset
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP1G175GMNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop with reset
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP1G175GNNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop with reset
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP1G175GSNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop with reset
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP2G00RA3Diodes IncorporatedNot recordedNot recordedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual 2-input NAND gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AME8500AEETAE46LAMENot recordedNot recordedNot recordedAME
- What it is
- Not recorded
- Maker
- AME
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4.63V, -Reset Push-pull output, 150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AME8500AEETAE46YAMENot recordedNot recordedNot recordedAME
- What it is
- Not recorded
- Maker
- AME
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4.63V, -Reset Push-pull output, 150ms
- 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.
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.
Darlington 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 collector and about 1.1 to 1.4 V to the emitter, two junctions in series, and open the other way round. Collector to emitter reads open. Built-in resistors can change these readings.
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.
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.
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.
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