SMD code BGs
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and BG was searched.
170 parts are printed BGs
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.
SMBG13CASMBG2 pins, VishayNot recordedSMBG2 pinsVishay
- What it is
- Not recorded
- Maker
- Vishay
- Package
- SMBG
- Pins
- 2
- Details
- TVS: 13V, 27.9A, 600W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJ13CA-TSMBTVS diode, 2 pins, INPAQ TechnologyTVS diodeSMB2 pinsINPAQ Technology
- What it is
- TVS diode
- Maker
- INPAQ Technology
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=14.4..15.9V, Vrwm=13V, Ipp=27.9A, 600W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMCG78CSMCGTVS diode, 2 pins, VishayTVS diodeSMCG2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMCG
- Pins
- 2
- Details
- TVS: 78V, 10.8A, 1500W (1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SODJ13CA-SHSOD-123FTVS diode, 2 pins, LRCTVS diodeSOD-123F2 pinsLRC
- What it is
- TVS diode
- Maker
- LRC
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=13V, Vbr=14.4..15.9V, Ipp=20A(8.3ms), 200W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TC1272ALVNBTRSOT-233 pins, MicrochipNot recordedSOT-233 pinsMicrochip
- What it is
- Not recorded
- Maker
- Microchip
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
TC1302BGSVMFDFNLDO regulator, MicrochipLDO regulatorDFNNot recordedMicrochip
- What it is
- LDO regulator
- Maker
- Microchip
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vo1/Vo2=2.7V(300mA)/1.5V(150mA)±2.5%, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
TFMCJ78CSMC2 pins, RectronNot recordedSMC2 pinsRectron
- What it is
- Not recorded
- Maker
- Rectron
- Package
- SMC
- Pins
- 2
- Details
- TVS: 78V, 10.8A, 1500W (1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TSMA20ASMATVS diode, 2 pins, VishayTVS diodeSMA2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=19.0..21.0V, Vrwm=17.1V, Ipp=15A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A130JSMA2 pins, ComchipNot recordedSMA2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- TVS: 13V, 5%, 18.6A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A130J-GSMATVS diode, 2 pins, ComchipTVS diodeSMA2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=13.0V, Vbr=14.40..15.90V, Ipp=18.60A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
5 more parts have no package on record
SMBS13CATVS diode, Formosa MicrosemiTVS diodeNot recordedNot recordedFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=13V, Vbr=14.4..15.9V, Ipp=27.9A, 600W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMD15KPA28CATVS diode, MDE SemiconductorTVS diodeNot recordedNot recordedMDE Semiconductor
- What it is
- TVS diode
- Maker
- MDE Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=28.0V, Vbr=31.28V, Vcl=47.5V, Ipp=317.9A, 15000W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMD30KPA28CATVS diode, MDE SemiconductorTVS diodeNot recordedNot recordedMDE Semiconductor
- What it is
- TVS diode
- Maker
- MDE Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=28.0V, Vbr=31.3V, Vcl=50.0V, Ipp=606.0A, 30000W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TFZ9.1BZener diode, ROHMZener diodeNot recordedNot recordedROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 8.57..9.01V, Izt=20mA, Zzt=8, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
TFZV9.1BZener diode, ROHMZener diodeNot recordedNot recordedROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 8.57..9.01V, Izt=20mA, Zzt=8, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener 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.
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.
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.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
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, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
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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