SMD code S3G
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.
16 parts are printed S3G
Not sure which one you have?
Answer up to 4 quick questions and these 16 parts are ranked, with a meter test that settles it. It works on a dead part too.
FM304-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.
FM304-CFSMCFRectifier, 2 pins, Formosa MicrosemiRectifierSMCF2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMCF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-S3GBSMBRectifier, 2 pins, LRCRectifierSMB2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMB
- Pins
- 2
- Details
- Rectifier, VPK 400 V, IO @ TL 3 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GBSMBRectifier, 2 pins, LRCRectifierSMB2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMB
- Pins
- 2
- Details
- Rectifier, VPK 400 V, IO @ TL 3 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GB-HFSMBRectifier, 2 pins, ComchipRectifierSMB2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 400 V, 3 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GBFSMBFRectifier, 2 pins, LRCRectifierSMBF2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMBF
- Pins
- 2
- Details
- Rectifier, VPK 400 V, IO @ TL 3 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GCSMCRectifier, 2 pins, YFWRectifierSMC2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SMC
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GC-HFSMCRectifier, 2 pins, ComchipRectifierSMC2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMC
- Pins
- 2
- Details
- 400 V, 3 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S3GFSMAFRectifier, 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.
TS3GSMCRectifier, 2 pins, Galaxy MicroelectronicsRectifierSMC2 pinsGalaxy Microelectronics
- What it is
- Rectifier
- Maker
- Galaxy Microelectronics
- Package
- SMC
- Pins
- 2
- Details
- 3A, 400V, Surface Mount Standard Recovery Rectifiers
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1SS355GSOD-3232 pins, UnisonicNot recordedSOD-3232 pinsUnisonic
- What it is
- Not recorded
- Maker
- Unisonic
- Package
- SOD-323
- Pins
- 2
- Details
- Diode: Sw, Fast, 80V, 100mA, <3pF, <4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
1SS355G-CB2SOD-3232 pins, UnisonicNot recordedSOD-3232 pinsUnisonic
- What it is
- Not recorded
- Maker
- Unisonic
- Package
- SOD-323
- Pins
- 2
- Details
- Diode: Sw, Fast, 80V, 100mA, Vf<1.2V(100mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
S-1721B2828-M6T1SOT-23-66 pins, ABLICNot recordedSOT-23-66 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-23-6
- Pins
- 6
- Details
- equivalent [2.8/2.8V Dual LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
2 more parts have no package on record
QG304AMRectifier, 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-CS3GBRectifier, LRCRectifierNot recordedNot recordedLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier, VPK 400 V, IO @ TL 3 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
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.
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 S3G
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 18 more parts.
Did you find your part?
Open this in the search to correct a character or try another package.