SMD code MM5
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.
26 parts are printed MM5
Not sure which one you have?
Answer up to 4 quick questions and these 26 parts are ranked, with a meter test that settles it. It works on a dead part too.
ABSS138ES-HFSOT-23N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
ABSS138ESL-HFSOT-883N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-8833 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-883
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
ABSS138ESM-HFSOT-723N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-7233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-723
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
ABSS138EST-HFSOT-523N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-5233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-523
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
ABSS138ESW-HFSOT-323N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-3233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138EDWSOT-363Dual N-channel MOSFET, 6 pins, Galaxy MicroelectronicsDual N-channel MOSFETSOT-3636 pinsGalaxy Microelectronics
- What it is
- Dual N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-363
- Pins
- 6
- Details
- 0.36A, 50V, 0.31W, N Channel, Dual MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
BSS138EDW-HFSOT-363Dual N-channel MOSFET, 6 pins, ComchipDual N-channel MOSFETSOT-3636 pinsComchip
- What it is
- Dual N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-363
- Pins
- 6
- Details
- 50 V, 0.36 A dual N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
BSS138ESSOT-23N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 0.36A, 50V, 0.35W, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ES-HFSOT-23N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ESLSOT-883N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-8833 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-883
- Pins
- 3
- Details
- 0.36A, 50V, 0.15W, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ESL-HFSOT-883N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-8833 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-883
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ESMSOT-723N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-7233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-723
- Pins
- 3
- Details
- 50V, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ESM-HFSOT-723N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-7233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-723
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138ESTSOT-523N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-5233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-523
- Pins
- 3
- Details
- 0.36A, 50V, 0.15W, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138EST-HFSOT-523N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-5233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-523
- Pins
- 3
- Details
- 50 V, 0.36 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
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.
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.
N-channel MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
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 MM5
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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