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SMD code 1025

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.

1025 on a chip resistor

10.2 MΩ

10.2 MΩ resistor, 1%

102 followed by 5 zeros. Four digits is normally the 1% series.

Check it with a meter

Lift one end and measure across it. A good one reads 10.2 MΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 10.2 MΩ on the board is a fault. Open, or well above 10.2 MΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 10.2 MΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23-5, QFN, SOIC-8), 1025 is a part code instead. Those parts are listed below.

2 parts are printed 1025

Not sure which one you have?

Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • BL1025SOT-563Dual P-channel MOSFET, 6 pins, Galaxy MicroelectronicsDual P-channel MOSFETSOT-5636 pinsGalaxy Microelectronics
    What it is
    Dual P-channel MOSFET
    Maker
    Galaxy Microelectronics
    Package
    SOT-563
    Pins
    6
    Details
    -0.2A, -60V, 0.3W, P Channel, Dual MOSFETs
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: P-channel MOSFET pair.

    Datasheetfor BL1025, opens in a new tab
  • LT1025CS8SOIC-88 pins, Analog DevicesNot recordedSOIC-88 pinsAnalog Devices
    What it is
    Not recorded
    Maker
    Analog Devices
    Package
    SOIC-8
    Pins
    8
    Details
    equivalent LT1025CN8
    Source
    Published code list

    Is it dead? The meter test is below: This part.

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.

P-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 drain, black on the source: 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. 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.

Printed with a code easy to misread as 1025

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 1025

For a marking with its end worn or burnt off. Each code has a page of its own.

Did you find your part?

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