SMD code RDs
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 RD was searched.
77 parts are printed RDs
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.
SMAJ54GSMATVS diode, 2 pins, First SemiconductorTVS diodeSMA2 pinsFirst Semiconductor
- What it is
- TVS diode
- Maker
- First Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=54V, Vbr=60.0..76.0V, Ipp=4.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SRC1211ESOT-5233 pins, AukNot recordedSOT-5233 pinsAuk
- What it is
- Not recorded
- Maker
- Auk
- Package
- SOT-523
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 150mW, 200MHz, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
SRC1211USOT-3233 pins, AukNot recordedSOT-3233 pinsAuk
- What it is
- Not recorded
- Maker
- Auk
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 200mW, 200MHz, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
TSMA120SMATVS diode, 2 pins, VishayTVS diodeSMA2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=108..132V, Vrwm=97.2V, Ipp=2.4A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A540KSMA2 pins, ComchipNot recordedSMA2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- TVS: 54V, 10%, 4.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A540K-GSMATVS diode, 2 pins, ComchipTVS diodeSMA2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=54.0V, Vbr=60.0..73.30V, Ipp=4.15A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
9 more parts have no package on record
Si1551DLVishayNot recordedNot recordedNot recordedVishay
- What it is
- Not recorded
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Dual Channel Mosfet
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
SM4T18SGS-Thomson MicroelectronicsNot recordedNot recordedNot recordedSGS-Thomson Microelectronics
- What it is
- Not recorded
- Maker
- SGS-Thomson Microelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TVS: 18V, 16A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SRC1211EFAukNot recordedNot recordedNot recordedAuk
- What it is
- Not recorded
- Maker
- Auk
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 150mW, 200MHz, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
SRC1211UFAukNot recordedNot recordedNot recordedAuk
- What it is
- Not recorded
- Maker
- Auk
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 200mW, 200MHz, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
XC6127C22FNRVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset PPO, -MR, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129C22L9R-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset PPO, Releas. Delay, Det. Delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129C22LNR-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset PPO, Releas. Delay, Det. Delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129N22L9R-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset ODO, Releas. Delay, Det. Delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129N22LNR-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset ODO, Releas. Delay, Det. Delay
- 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.
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.
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.
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.
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