SMD code ADp
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, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and AD was searched.
198 parts are printed ADp
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.
2SC3838KSOT-23NPN transistor, 3 pins, ROHMNPN transistorSOT-233 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC3838K-PSOT-23RF transistor, 3 pins, ROHMRF transistorSOT-233 pinsROHM
- What it is
- RF transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: VHF/UHF, 20V, 50mA, 200mW, B=82..180, 3.2GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC4083SOT-323NPN transistor, 3 pins, ROHMNPN transistorSOT-3233 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4726SOT-4163 pins, ROHMNot recordedSOT-4163 pinsROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- npn 11V 3.2GHz TV tuners
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4726-PSOT-416RF transistor, 3 pins, ROHMRF transistorSOT-4163 pinsROHM
- What it is
- RF transistor
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- Si-npn: VHF/UHF, 20V, 50mA, 150mW, B=82..180, 3.2GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC5662SOT-7233 pins, ROHMNot recordedSOT-7233 pinsROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- SOT-723
- Pins
- 3
- Details
- npn 11V 3.2GHz TV tuners
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5662-PSOT-723RF transistor, 3 pins, ROHMRF transistorSOT-7233 pinsROHM
- What it is
- RF transistor
- Maker
- ROHM
- Package
- SOT-723
- Pins
- 3
- Details
- Si-npn: VHF/UHF, 20V, 50mA, 150mW, B=82..180, 3.2GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SD1366A-ADSOT-893 pins, RenesasNot recordedSOT-893 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: AF, 30V, 1A, 1W, B=120..240, 240MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SD1366A-DSOT-89NPN transistor, 3 pins, RenesasNPN transistorSOT-893 pinsRenesas
- What it is
- NPN transistor
- Maker
- Renesas
- Package
- SOT-89
- Pins
- 3
- Details
- NPN transistor: AF, 30V, 1A, 1W, B=120..240, 240MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SD1366ADSOT-893 pins, RenesasNot recordedSOT-893 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
7SB384DFTSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
7SB384DTTSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
7WBD3126USUS88 pins, onsemiNot recordedUS88 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- US8
- Pins
- 8
- Details
- CMOS logic IC: 2-Bit translating bus switch
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
12A02CHSOT-233 pins, Sanyo ElectricNot recordedSOT-233 pinsSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- SOT-23
- Pins
- 3
- Details
- PNP transistor
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
1 more part has no package on record
2SC4043SROHMNot recordedNot recordedNot recordedROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- npn 11V 3.2GHz TV tuners
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
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.
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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