SMD code TF 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.
3 parts in SOT-23 are printed TF
Not sure which one you have?
Answer up to 4 quick questions and these 24 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SC5433FBSOT-233 pins, RenesasNot recorded3 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Details
- npn RF fT 7GHz 10V 65mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
BAL99SOT-23Switching diode, 3 pins, Transys ElectronicsSwitching diode3 pinsTransys Electronics
- What it is
- Switching diode
- Maker
- Transys Electronics
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
KIC7SZ14FUSOT-233 pins, KECNot recorded3 pinsKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-Logic: Inverting Schmitt-trigger
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
12 more parts have no package on record. Nothing rules them out, so they stay.
LNTA4001NT1GN-channel MOSFET, LRCN-channel MOSFETNot recordedLRC
- What it is
- N-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, N-Channel(with ESD), VDSS 20 V, VGS 10 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
NCP105AMX280LDO regulator, onsemiLDO regulatorNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator - High PSRR
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCV8177AMTW330LDO regulator, onsemiLDO regulatorNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear Voltage Regulator, Fast Transient Response, 500 mA with Enable
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
S-LNTA4001NT1GN-channel MOSFET, LRCN-channel MOSFETNot recordedLRC
- What it is
- N-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, N-Channel(with ESD), VDSS 20 V, VGS 10 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
MTA2K5N03KFEN-channel MOSFET, CYStekN-channel MOSFETNot recordedCYStek
- What it is
- N-channel MOSFET
- Maker
- CYStek
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 30 V, 0.39 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
74HCT1G14GWNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Inverter with Schmitt-trigger input
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP7341-11FS4-7LDO 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, 1.1V±1%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BD45335GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 3,3V, -Reset Open drain output, 500ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127C26HNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±0.8%, +Reset PPO, -MR, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KDZ36FVZener diode, KECZener diodeNot recordedKEC
- What it is
- Zener diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 34.0..38.0V, Izt=2mA, Zzt=300, 100mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
TC75S59FComparator, ToshibaComparatorNot recordedToshiba
- What it is
- Comparator
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage comparator IC: CMOS, Vcc=±3.5..±7V, Icc0=200µA, Iout=±35mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
TC75S59FEComparator, ToshibaComparatorNot recordedToshiba
- What it is
- Comparator
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage comparator IC: CMOS, Vcc=±3.5..±7V, Icc0=200µA, Iout=±35mA
- 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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
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.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
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. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. 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.
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.
Printed with a code easy to misread as TF
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with TF
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 18 more parts.
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