SMD code M2H 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.
2 parts in SOT-23 are printed M2H
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.
PIN diode, all SOT-23, 3 pins, all Panasonic.
MA3X555SOT-23
- What it is
- PIN diode
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Details
- PIN diode: Dual, UHF/SHF-AGC, 40V, 100mA, Vf=1V(100mA), 0.3pF
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
MA555SOT-23
- What it is
- PIN diode
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Details
- PIN diode: Dual, UHF/SHF-AGC, 40V, 100mA, Vf=1V(100mA), 0.3pF
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, 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.
- 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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
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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