SMD code E40 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.
4 parts in SOT-23 are printed E40
Not sure which one you have?
Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.
GS809CJEUESOT-23Voltage supervisor, VishayVoltage supervisorVishay
- What it is
- Voltage supervisor
- Maker
- Vishay
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 4V, -Reset Push-pull output, 150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KIC77E40TSOT-23Voltage supervisor, KECVoltage supervisorKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 4.0V±1%, -Reset ODO, Rdt=400ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6382A401MSOT-23DC-DC converter, TorexDC-DC converterTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 4.0V±2.5%, 400mA, 100kHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6385A401MSOT-23DC-DC converter, TorexDC-DC converterTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 4.0V±2.5%, 400mA, 100kHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
3 more parts have no package on record. Nothing rules them out, so they stay.
LN2440LT1GN-channel MOSFET, LRCN-channel MOSFETLRC
- What it is
- N-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, N-Channel, VDSS 40 V, VGS 20 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
S-LN2440LT1GN-channel MOSFET, LRCN-channel MOSFETLRC
- What it is
- N-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, N-Channel, VDSS 40 V, VGS 20 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
KIC77E40MVoltage supervisor, KECVoltage supervisorKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.0V±1%, -Reset ODO, 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.
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.
Printed with a code easy to misread as E40
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 E40
For a marking with its end worn or burnt off. Each code has a page of its own.
Did you find your part?
Open this in the search to correct a character or try another package.