SMD code S2B
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.
20 parts are printed S2B
Not sure which one you have?
Answer up to 4 quick questions and these 20 parts are ranked, with a meter test that settles it. It works on a dead part too.
FM202-AFSMAFRectifier, 2 pins, Formosa MicrosemiRectifierSMAF2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMAF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FM202-BFSMBFRectifier, 2 pins, Formosa MicrosemiRectifierSMBF2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMBF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
GESD5V0S2B3SOD-323ESD protection diode, 2 pins, Galaxy MicroelectronicsESD protection diodeSOD-3232 pinsGalaxy Microelectronics
- What it is
- ESD protection diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-323
- Pins
- 2
- Details
- 5V, 108W, Surface Mount TVS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
S2B-HFSMARectifier, 2 pins, ComchipRectifierSMA2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 100 V, 2 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S2BASMARectifier, 2 pins, LRCRectifierSMA2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMA
- Pins
- 2
- Details
- Rectifier, VPK 100 V, IO @ TL 2 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S2BBSMBRectifier, 2 pins, LRCRectifierSMB2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMB
- Pins
- 2
- Details
- Rectifier, VPK 100 V, IO @ TL 2 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S2BB-HFSMBRectifier, 2 pins, ComchipRectifierSMB2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 100 V, 2 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S2BBFSMBFRectifier, 2 pins, LRCRectifierSMBF2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMBF
- Pins
- 2
- Details
- Rectifier, VPK 100 V, IO @ TL 2 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S2BFSMAFRectifier, 2 pins, YFWRectifierSMAF2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SMAF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TGESD5V0S2B3SOD-323ESD protection diode, 2 pins, Galaxy MicroelectronicsESD protection diodeSOD-3232 pinsGalaxy Microelectronics
- What it is
- ESD protection diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-323
- Pins
- 2
- Details
- 5V, 108W, Surface Mount TVS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
S-1721A1212-M6T1SOT-23-66 pins, ABLICNot recordedSOT-23-66 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-23-6
- Pins
- 6
- Details
- equivalent [1.2/1.2V Dual LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
4 more parts have no package on record
FM202-MFLRectifier, Formosa MicrosemiRectifierNot recordedNot recordedFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
QG202AMRectifier, SeCoSRectifierNot recordedNot recordedSeCoS
- What it is
- Rectifier
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-1721A1212-I6T16 pins, ABLICNot recordedNot recorded6 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- Not recorded
- Pins
- 6
- Details
- equivalent [1.2/1.2V Dual LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1721A1212-I6T1xLDO regulator, Seiko InstrumentsLDO regulatorNot recordedNot recordedSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.2V/1.2V±1.0%, 150mA, +CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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 S2B
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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