SMD code -AS
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.
106 parts are printed -AS
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.
TMBRX2A0SOD-123FSchottky diode, 2 pins, Galaxy MicroelectronicsSchottky diodeSOD-123F2 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123F
- Pins
- 2
- Details
- 2A, 100V, Surface Mount Schottky Barrier Rectifiers
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
2PB709SSOT-23PNP transistor, 3 pins, PhilipsPNP transistorSOT-233 pinsPhilips
- What it is
- PNP transistor
- Maker
- Philips
- Package
- SOT-23
- Pins
- 3
- Details
- PNP transistor: GP, 25V, 100mA, 250mW, B=290..460, >80MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2PD1820ASSOT-3233 pins, PhilipsNot recordedSOT-3233 pinsPhilips
- What it is
- Not recorded
- Maker
- Philips
- Package
- SOT-323
- Pins
- 3
- Details
- gp sw amp 50V npn hfe 170-340
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1655SOT-233 pins, Sanyo ElectricNot recordedSOT-233 pinsSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 50V, 100mA, 200mW, 200MHz, R1/R2=4.7k/4.7k
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA2012SOT-893 pins, Sanyo ElectricNot recordedSOT-893 pinsSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- SOT-89
- Pins
- 3
- Details
- pnp DC cov comp 2SC5565
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB709-SSOT-233 pins, PanNot recordedSOT-233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, AF, 50V, 600mA, B=290..460, 150MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB709SSOT-233 pins, Panasonic (Matsushita Electric Industrial Co.Not recordedSOT-233 pinsPanasonic (Matsushita Electric Industrial Co.
- What it is
- Not recorded
- Maker
- Panasonic (Matsushita Electric Industrial Co.
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB766SOT-89PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-893 pinsGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SB0766-SSOT-89PNP transistor, 3 pins, PanasonicPNP transistorSOT-893 pinsPanasonic
- What it is
- PNP transistor
- Maker
- Panasonic
- Package
- SOT-89
- Pins
- 3
- Details
- PNP transistor: AF, 50V, 1A, 1W, B=170..340, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SB766-SSOT-893 pins, PanNot recordedSOT-893 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: AF, 50V, 1A, 1W, B=120..240, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB1218-SSOT-3233 pins, PanNot recordedSOT-3233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-323
- Pins
- 3
- Details
- Si-pnp: AF, 25V, 100mA, 150mW, B=290..460, >80MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB1462-SSOT-233 pins, PanNot recordedSOT-233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, 60V, 100mA, 80MHz, B=270..560
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC3380SOT-89NPN transistor, 3 pins, RenesasNPN transistorSOT-893 pinsRenesas
- What it is
- NPN transistor
- Maker
- Renesas
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: Vid, 300V, 100mA, 1W, B=30..200, 80MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2 more parts have no package on record
ULC0342PESD protection diode, LeiditechESD protection diodeNot recordedNot recordedLeiditech
- What it is
- ESD protection diode
- Maker
- Leiditech
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection diode, VRWM 3.3 V, Cj 0.6 pF
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
VESD05A6-HAFESD protection diode, VishayESD protection diodeNot recordedNot recordedVishay
- What it is
- ESD protection diode
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 6-Line ESD Protection Diode Array in LLP75
- Source
- Manufacturer datasheet
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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.
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.
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