SMD code RQ in SMA
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.
7 parts in SMA are printed RQ
Not sure which one you have?
Answer up to 4 quick questions and these 15 parts are ranked, with a meter test that settles it. It works on a dead part too.
SMAJ75SMATVS diode, 2 pins, DOWOTVS diode2 pinsDOWO
- What it is
- TVS diode
- Maker
- DOWO
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
EC76SMAJ75SMATVS diode, 2 pins, E-CMOSTVS diode2 pinsE-CMOS
- What it is
- TVS diode
- Maker
- E-CMOS
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=83.3..102V, Vrwm=75V, Ipp=3.0A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ75SMATVS diode, 2 pins, PanjitTVS diode2 pinsPanjit
- What it is
- TVS diode
- Maker
- Panjit
- Package
- SMA
- Pins
- 2
- Details
- TVS: 75V, 3A, 400W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ75GSMATVS diode, 2 pins, First SemiconductorTVS diode2 pinsFirst Semiconductor
- What it is
- TVS diode
- Maker
- First Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=75V, Vbr=83.0..105.7V, Ipp=3.0A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TSMA180SMATVS diode, 2 pins, VishayTVS diode2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=162..198V, Vrwm=148V, Ipp=1.6A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A750KSMA2 pins, ComchipNot recorded2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- TVS: 75V, 10%, 3A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A750K-GSMATVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=75.0V, Vbr=83.30..102.0V, Ipp=2.99A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
8 more parts have no package on record. Nothing rules them out, so they stay.
74AXP1T34GMNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AXP1T34GNNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AXP1T34GSNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AXP1T34GWNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AXP1T34GXNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual supply translating buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5354FVEVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 5,4V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5354GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 5,4V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SM4T30SGS-Thomson MicroelectronicsNot recordedNot recordedSGS-Thomson Microelectronics
- What it is
- Not recorded
- Maker
- SGS-Thomson Microelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TVS: 30V, 9,6A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection 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.
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.
Printed with a code easy to misread as RQ
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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