SMD code A20 in SMB
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.
4 parts in SMB are printed A20
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
10BJ20ASMBTVS diode, 2 pins, JieJieTVS diode2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10BJ20A-AUSMBTVS diode, 2 pins, JieJieTVS diode2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10SMBJ20ASMBTVS diode, 2 pins, UN SemiconductorTVS diode2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=20.0V, Vbr=22.20..24.50V, Ipp=30.9A, 1000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBYW02-200SMB2 pins, STMicroelectronicsNot recorded2 pinsSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- SMB
- Pins
- 2
- Details
- Si-diode: Rectifier, Fast Recovery, 200V, 2A, Vf<0,91V(1A), <35ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
11 more parts have no package on record. Nothing rules them out, so they stay.
AP2N030ENN-channel MOSFET, Advanced Power ElectronicsN-channel MOSFETNot recordedAdvanced Power Electronics
- What it is
- N-channel MOSFET
- Maker
- Advanced Power Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 20 V, 5.3 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
APA2010Audio amplifier, AnpecAudio amplifierNot recordedAnpec
- What it is
- Audio amplifier
- Maker
- Anpec
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 3W Mono Class-D Audio Power Amplifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
APA2010BAudio amplifier, AnpecAudio amplifierNot recordedAnpec
- What it is
- Audio amplifier
- Maker
- Anpec
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 3W Mono Class-D Audio Power Amplifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
SM2420NSANN-channel MOSFET, Sinopower SemiconductorN-channel MOSFETNot recordedSinopower Semiconductor
- What it is
- N-channel MOSFET
- Maker
- Sinopower Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 20 V, 6.5 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
2SK436JFET, SanyoJFETNot recordedSanyo
- What it is
- JFET
- Maker
- Sanyo
- Package
- Not recorded
- Pins
- Not recorded
- Details
- N-channel JFET
- Source
- Published code list
Is it dead? The meter test is below: JFET.
2SK436-20Sanyo ElectricNot recordedNot recordedSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- FET n-type: RF-AM, LN, 15V, 20mA, 150mW, Idss=3.5..6mA
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
2SK1066-20Sanyo ElectricNot recordedNot recordedSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- n-FET: GP, 15V, 20mA, 100mW, Idss=3,5..6mA, Up<1,5V
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
APA2010HAAnpec ElectronicsNot recordedNot recordedAnpec Electronics
- What it is
- Not recorded
- Maker
- Anpec Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear IC: APA, BTL, class-D, 2.7..5.5V, 3W(5V/4), shutdown
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
DAM1MA20ESD protection diode, HitachiESD protection diodeNot recordedHitachi
- What it is
- ESD protection diode
- Maker
- Hitachi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ElectroStatic Discharge Protection diode: Vdc=14V, Vzt=18.8..21.2V, Izt=15mA, 600W(100µs)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
DAM3MA20ESD protection diode, HitachiESD protection diodeNot recordedHitachi
- What it is
- ESD protection diode
- Maker
- Hitachi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ElectroStatic Discharge Protection diode: Vdc=14V, Vzt=18.8..21.2V, Izt=45mA, 1800W(100µs)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
KIC77A20MVoltage supervisor, KECVoltage supervisorNot recordedKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.0V±1%, -Reset ODO, Rdt=240ms
- 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.
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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- Open both ways: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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.
JFET
Ohms range for drain to source, diode range for the gate, part lifted.
Working, it reads
Drain to source conducts both ways at a few hundred ohms, depending on the part, and some meters beep on it. The gate reads one junction to drain and to source, about 0.6 to 0.7 V, and open the other way.
Dead, it reads
- The gate the same both ways to drain or source, near 0 V with a continuous beep: gate shorted.
- Drain to source open: the channel has 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:
- Drain to source resistance varies from part to part. An identical part elsewhere on the board shows what is normal.
- Watch for:
- A good channel can beep like a short between drain and source. That is normal; the gate junction says whether it has failed.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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 A20
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with A20
For a marking with its end worn or burnt off. Each code has a page of its own.
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