SMD code TI- 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.

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.

Nothing is printed exactly TI-

These parts are printed with a character that is easy to misread as what you typed. The odd one out is marked on each.

all SOT-23, 3 pins. What differs:

BCX17TAprinted T1SOT-23Diodes IncorporatedNot recordedDiodes Incorporated
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Diodes Incorporated
Package
SOT-23
Pins
3
Details
PNP medium power transistor
Source
Published code list
Is it dead? The meter test is below: Bipolar transistor.
BSS63printed T1SOT-23MOSFET, onsemiMOSFETonsemi
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
MOSFET
Maker
onsemi
Package
SOT-23
Pins
3
Source
Published code list
Is it dead? The meter test is below: MOSFET.
Datasheetfor BSS63, opens in a new tab
BSS63T1printed T1SOT-23onsemiNot recordedonsemi
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
onsemi
Package
SOT-23
Pins
3
Source
Published code list
Is it dead? The meter test is below: This part.
EC95810N41B1Nprinted 71SOT-23Voltage supervisor, E-CMOSVoltage supervisorE-CMOS
Printed 71 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
E-CMOS
Package
SOT-23
Pins
3
Details
Voltage detector IC: 4.1V±2%, -Reset ODO, Rdt=200ms
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7521CBBprinted 71SOT-23Voltage supervisor, ELM TechnologyVoltage supervisorELM Technology
Printed 71 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
ELM Technology
Package
SOT-23
Pins
3
Details
Voltage detector IC: 2.1V±2%, +Reset PPO
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7521NBBprinted 71SOT-23Voltage supervisor, ELM TechnologyVoltage supervisorELM Technology
Printed 71 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
ELM Technology
Package
SOT-23
Pins
3
Details
Voltage detector IC: 2.1V±2%, +Reset ODO
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7641HCBprinted T1SOT-23Voltage supervisor, ELM TechnologyVoltage supervisorELM Technology
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
ELM Technology
Package
SOT-23
Pins
3
Details
Voltage detector IC: 4.1V±2%, +Reset PPO, Rdt=150ms
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM9751CBBprinted T1SOT-23Voltage supervisor, ELM TechnologyVoltage supervisorELM Technology
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
ELM Technology
Package
SOT-23
Pins
3
Details
Voltage detector IC: 5.1V±2.5%, +Reset PPO
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
FT532Igprinted 7IgSOT-23LDO regulator, Fremont Micro DevicesLDO regulatorFremont Micro Devices
Printed 7Ig on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Fremont Micro Devices
Package
SOT-23
Pins
3
Details
Linear voltage regulator IC: LDO, 3.0V±2%, 700mA
Source
Published code list
Is it dead? The meter test is below: Voltage regulator.
FT532Ihprinted 7ISOT-23LDO regulator, Fremont Micro DevicesLDO regulatorFremont Micro Devices
Printed 7I on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
Fremont Micro Devices
Package
SOT-23
Pins
3
Details
Linear voltage regulator IC: LDO, 3.0V±2%, 700mA
Source
Published code list
Is it dead? The meter test is below: Voltage regulator.
HSMS-2862printed T1SOT-23Agilent TechnologiesNot recordedAgilent Technologies
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Agilent Technologies
Package
SOT-23
Pins
3
Details
Si-diode: Dual, Schottky, 5V, Vf(If=30mA)<0.6V, Ct<0.3pF, Rd=10Ω
Source
Published code list
Is it dead? The meter test is below: Schottky diode.
HSMX-3131printed T1SOT-23BroadcomNot recordedBroadcom
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Broadcom
Package
SOT-23
Pins
3
Source
Published code list
Is it dead? The meter test is below: This part.
MCP103T-315I/TTprinted TLSOT-23MicrochipNot recordedMicrochip
Printed TL on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Microchip
Package
SOT-23
Pins
3
Source
Published code list
Is it dead? The meter test is below: This part.
PBRN113ZTprinted -7LSOT-23Digital transistor (NPN, resistors built in), NXPDigital transistor (NPN, resistors built in)NXP
Printed -7L on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Digital transistor (NPN, resistors built in)
Maker
NXP
Package
SOT-23
Pins
3
Details
NPN transistor: Sw, 40V, 600mA, 250mW, R1/R2=1k/10k
Source
Published code list
Is it dead? The meter test is below: Digital transistor.
R3130N44HAprinted T1SOT-23Nisshinbo Micro DevicesNot recordedNisshinbo Micro Devices
Printed T1 on the part. Easy to misread as TI-. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Nisshinbo Micro Devices
Package
SOT-23
Pins
3
Details
CMOS-IC: Voltage Detector 4,4V, -Reset Push-pull output, 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.

Bipolar transistor

Diode range, part lifted or its base leg off the pad.

Working, it reads

From the base, one probe colour 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.

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.

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.

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.

Schottky diode

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.

Dead, it reads

The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
A reading the wrong way round as well: leaky.
Open both ways: failed open.

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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Digital transistor

Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.

Working, it reads

Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.

Dead, it reads

Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
Base to emitter near 0 Ω: failed short.

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:: The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
Watch for:: On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.

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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