SMD code T4s
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and T4 was searched.
165 parts are printed T4s
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.
A1N4148W-HFSOD-123Switching diode, 2 pins, ComchipSwitching diodeSOD-1232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 75 V, 150 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
A1N4148WS-HFSOD-323Switching diode, 2 pins, ComchipSwitching diodeSOD-3232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-323
- Pins
- 2
- Details
- 75 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
A1N4148WT-HFSOD-523Switching diode, 2 pins, ComchipSwitching diodeSOD-5232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-523
- Pins
- 2
- Details
- 75 V, 125 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ABAS16WS-HFSOD-323Switching diode, 2 pins, ComchipSwitching diodeSOD-3232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-323
- Pins
- 2
- Details
- 100 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ACDBMS240-HFSOD-123FSchottky diode, 2 pins, ComchipSchottky diodeSOD-123F2 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.
ACDSW4148-HFSOD-123Switching diode, 2 pins, ComchipSwitching diodeSOD-1232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 100 V, 150 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ACDSW4448-HFSOD-123Switching diode, 2 pins, ComchipSwitching diodeSOD-1232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 75 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16HSOD-323Switching diode, 2 pins, SeCoSSwitching diodeSOD-3232 pinsSeCoS
- What it is
- Switching diode
- Maker
- SeCoS
- Package
- SOD-323
- Pins
- 2
- Details
- 0.2A, 75V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16WSOT-323Switching diode, 3 pins, Yangjie Electronic TechSwitching diodeSOT-3233 pinsYangjie Electronic Tech
- What it is
- Switching diode
- Maker
- Yangjie Electronic Tech
- Package
- SOT-323
- Pins
- 3
- Details
- SMD Small Signal Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16WQSOD-123Switching diode, 2 pins, Yangjie Electronic TechSwitching diodeSOD-1232 pinsYangjie Electronic Tech
- What it is
- Switching diode
- Maker
- Yangjie Electronic Tech
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16WSSOD-323Switching diode, 2 pins, Yangjie Electronic TechSwitching diodeSOD-3232 pinsYangjie Electronic Tech
- What it is
- Switching diode
- Maker
- Yangjie Electronic Tech
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16WS-HFSOD-323Switching diode, 2 pins, ComchipSwitching diodeSOD-3232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-323
- Pins
- 2
- Details
- 85 V, 250 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS16WSQSOD-323Switching diode, 2 pins, Yangjie Electronic TechSwitching diodeSOD-3232 pinsYangjie Electronic Tech
- What it is
- Switching diode
- Maker
- Yangjie Electronic Tech
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAS516SOD-523Switching diode, 2 pins, LeiditechSwitching diodeSOD-5232 pinsLeiditech
- What it is
- Switching diode
- Maker
- Leiditech
- Package
- SOD-523
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV16WSOD-123Switching diode, 2 pins, Diodes IncorporatedSwitching diodeSOD-1232 pinsDiodes Incorporated
- What it is
- Switching diode
- Maker
- Diodes Incorporated
- Package
- SOD-123
- 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.
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.
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