SMD code ST in DFN
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.
2 parts in DFN are printed ST
Not sure which one you have?
Answer up to 4 quick questions and these 17 parts are ranked, with a meter test that settles it. It works on a dead part too.
R3116L481CDFNVoltage supervisor, RicohVoltage supervisorRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.8V±0.8%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RP152L018BDFNLDO regulator, RicohLDO regulatorRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/1.8V±1%, 150mA, +CE, CL
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
13 more parts have no package on record. Nothing rules them out, so they stay.
SMAFJ180ATVS diode, Blue RocketTVS diodeBlue Rocket
- What it is
- TVS diode
- Maker
- Blue Rocket
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAFJ180A-MSTVS diode, MSKSEMITVS diodeMSKSEMI
- What it is
- TVS diode
- Maker
- MSKSEMI
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAHFL180ATVS diode, Formosa MicrosemiTVS diodeFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
1SMA43ATVS diode, onsemiTVS diodeonsemi
- What it is
- TVS diode
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TVS: 43V±5%, 5.8A, 400W (1ms),
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
1SMA43CAonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- TVS: 43V±5%, 5.8A, 400W (1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
74AUP2G34FW4Diodes IncorporatedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual noniverting buffers
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127C44GNRVoltage supervisor, IXYSVoltage supervisorIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.4V±0.8%, +Reset PPO, -MR, 100ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LT4ME200ATVS diode, Lite-On SemiconductorTVS diodeLite-On Semiconductor
- What it is
- TVS diode
- Maker
- Lite-On Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=200V, Vbr=224..248V, Ipp=1.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAS180ATVS diode, Formosa MicrosemiTVS diodeFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=180V, Vbr=201..222V, Ipp=1.4A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF4L200AQTVS diode, Diodes IncorporatedTVS diodeDiodes Incorporated
- What it is
- TVS diode
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=200V, Vbr=224..248V, Ipp=1.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
XC6127C44GNRVoltage supervisor, TorexVoltage supervisorTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.4V±0.8%, +Reset PPO, -MR, Rdt=100ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6223C34BNR-GLDO regulator, TorexLDO regulatorTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.45V±1%, 300mA, +CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC6237B291NR-GLDO regulator, TorexLDO regulatorTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 2.9V±1%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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.
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.
Printed with a code easy to misread as ST
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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