SMD code U1G
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.
12 parts are printed U1G
Not sure which one you have?
Answer up to 4 quick questions and these 12 parts are ranked, with a meter test that settles it. It works on a dead part too.
DHE1GSOD-123FRectifier, 2 pins, YFWRectifierSOD-123F2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SOD-123F
- Pins
- 2
- Details
- High-efficiency rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MURS140-MSOD-123Rectifier, 2 pins, Formosa MicrosemiRectifierSOD-1232 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SOD-123
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
US1GWSOD-123FRectifier, 2 pins, YFWRectifierSOD-123F2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SOD-123F
- Pins
- 2
- Details
- High-efficiency rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
3SK253GSOT-1434 pins, RenesasNot recordedSOT-1434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-143
- Pins
- 4
- Details
- dg RF mosfet
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
3SK255GSOT-3434 pins, RenesasNot recordedSOT-3434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-343
- Pins
- 4
- Details
- dg RF mosfet
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
MURS140SMA2 pins, onsemiNot recordedSMA2 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SMA
- Pins
- 2
- Details
- Si-diode: U-Fast Rectifier, 283V, 1A, Vf<1,25V(1A), 50ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
SMAU1GSMA2 pins, KECNot recordedSMA2 pinsKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- SMA
- Pins
- 2
- Details
- Si-diode: U-Fast Recovery, 400V, 1A, Vf<1,3V(1A), <50ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
5 more parts have no package on record
MURS140-BSRectifier, 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.
MURS140-BS-Q1Rectifier, 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.
MURS140-SF-Q1Rectifier, 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.
TCDU1GWRectifier, Taitron ComponentsRectifierNot recordedNot recordedTaitron Components
- What it is
- Rectifier
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Sintered Glass Passivated Ultra Fast Rectifiers
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
U10GHERectifier, Galaxy MicroelectronicsRectifierNot recordedNot recordedGalaxy Microelectronics
- What it is
- Rectifier
- Maker
- Galaxy Microelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 1A, 400V, 50ns, Surface Mount Fast Recovery Rectifiers
- 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.
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 U1G
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 U1G
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 8 more parts.
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