SMD code EX in SOT-23
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.
6 parts in SOT-23 are printed EX
Not sure which one you have?
Answer up to 4 quick questions and these 36 parts are ranked, with a meter test that settles it. It works on a dead part too.
BCW65FRSOT-233 pins, Ferranti SemiconductorsNot recorded3 pinsFerranti Semiconductors
- What it is
- Not recorded
- Maker
- Ferranti Semiconductors
- Package
- SOT-23
- Pins
- 3
- Details
- npn 45V 800mA hfe 100 min
- Source
- Published code list
Is it dead? The meter test is below: This part.
BCW66RFSOT-23NPN transistor, 3 pins, Ferranti SemiconductorsNPN transistor3 pinsFerranti Semiconductors
- What it is
- NPN transistor
- Maker
- Ferranti Semiconductors
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor: AF, 75V, 800mA, 330mW, B=100..250, >100MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
MAX6326UR24SOT-233 pins, Analog DevicesNot recorded3 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,4V, -Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SiP810CSEUADTSOT-23Voltage supervisor, 3 pins, VishayVoltage supervisor3 pinsVishay
- What it is
- Voltage supervisor
- Maker
- Vishay
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,93V, Reset Push-pull output 1,5ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
UN221NSOT-233 pins, PanNot recorded3 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 200mW, 150MHz, R1/R2=4k7/47k
- Source
- Published code list
Is it dead? The meter test is below: This part.
UNR221NSOT-233 pins, PanNot recorded3 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 200mW, 150MHz, R1/R2=4k7/47k
- Source
- Published code list
Is it dead? The meter test is below: This part.
9 more parts have no package on record. Nothing rules them out, so they stay.
ET52833YBLDO regulator, ETEKLDO regulatorNot recordedETEK
- What it is
- LDO regulator
- Maker
- ETEK
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
ET53733YBLDO regulator, ETEKLDO regulatorNot recordedETEK
- What it is
- LDO regulator
- Maker
- ETEK
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
FSA2275AUMAnalog switch, onsemiAnalog switchNot recordedonsemi
- What it is
- Analog switch
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- DPDT (0.5 ) HiFi Audio Switch w/ Negative Swing
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
LFCN-1282+RF filter, Mini-CircuitsRF filterNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, DC-12800 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
NCP161BMX500LDO regulator, onsemiLDO regulatorNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator for RF and Analog Circuits - Ultra-Low Noise and High PSRR
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
VS58VLNVWMTVS diode, ROHMTVS diodeNot recordedROHM
- What it is
- TVS diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient Voltage Suppressor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
VS58VLNVWMTFTVS diode, ROHMTVS diodeNot recordedROHM
- What it is
- TVS diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient Voltage Suppressor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AP7340-30FS4-7LDO regulator, Diodes IncorporatedLDO regulatorNot recordedDiodes Incorporated
- What it is
- LDO regulator
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.0V±1%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BU46K334GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.3V±1%, -Reset PPO, Rdt=400ms
- 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.
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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
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.
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.
Codes that begin with EX
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 71 more parts.
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