SMD code T4 in SOD-123F
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.
8 parts in SOD-123F are printed T4
Not sure which one you have?
Answer up to 4 quick questions and these 34 parts are ranked, with a meter test that settles it. It works on a dead part too.
1N4148WSOD-123FSwitching diode, 2 pins, Formosa MicrosemiSwitching diode2 pinsFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Pinout
- 1 cathode
- 2 anode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1N4148W-FLSOD-123FSwitching diode, 2 pins, Formosa MicrosemiSwitching diode2 pinsFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1N4148W-Q1SOD-123FSwitching diode, 2 pins, Formosa MicrosemiSwitching diode2 pinsFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ACDBMS240-HFSOD-123FSchottky diode, 2 pins, ComchipSchottky diode2 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOD-123F
- Pins
- 2
- Details
- 40 V, 2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAV16WSOD-123FSwitching diode, 2 pins, Formosa MicrosemiSwitching diode2 pinsFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Pinout
- 1 cathode
- 2 anode
- Details
- Surface-mount fast switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
CDBMS240-HFSOD-123FSchottky diode, 2 pins, ComchipSchottky diode2 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOD-123F
- Pins
- 2
- Details
- 40 V, 2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
L1N4148FT1GSOD-123FSwitching diode, 2 pins, LRCSwitching diode2 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOD-123F
- Pins
- 2
- Details
- Switching diode, VR 75 V, IF 150 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SM240FLSOD-123FSchottky diode, 2 pins, SeCoSSchottky diode2 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
7 more parts have no package on record. Nothing rules them out, so they stay.
1N4148WPSwitching diode, DiotecSwitching diodeNot recordedDiotec
- What it is
- Switching diode
- Maker
- Diotec
- Package
- Not recorded
- Pins
- Not recorded
- Details
- SMD Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1N4148WT-Q1Switching diode, Formosa MicrosemiSwitching diodeNot recordedFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1N4148WTHSwitching diode, Taiwan SemiconductorSwitching diodeNot recordedTaiwan Semiconductor
- What it is
- Switching diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
CD4148WSNSwitching diode, LeiditechSwitching diodeNot recordedLeiditech
- What it is
- Switching diode
- Maker
- Leiditech
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Switching diode, 100 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
NC7WB3125L8Analog switch, onsemiAnalog switchNot recordedonsemi
- What it is
- Analog switch
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 2-Bit Low Power Bus Switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NTB0104GU12Logic level translator, 12 pins, NXPLogic level translator12 pinsNXP
- What it is
- Logic level translator
- Maker
- NXP
- Package
- Not recorded
- Pins
- 12
- Details
- 1 General description
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
SCS4148DF-CSwitching diode, SeCoSSwitching diodeNot recordedSeCoS
- What it is
- Switching diode
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
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.
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.
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 T4
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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