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SMD marking

E42in SOT-723

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.

2 parts are printed E42

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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.

Digital transistor (NPN, resistors built in), all JSCJ.

  • DTC123JMSOT-723
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    JSCJ
    Package
    SOT-723
    Pins
    3
    Details
    Digital transistor (bias resistors built in), NPN
    Source
    From the manufacturer's datasheet

    Is it dead?

    Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.

    Working, it reads

    Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.

    Dead, it reads

    • Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
    • From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
    • Base to emitter near 0 Ω: failed short.
    On the board:
    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:
    The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
    Watch for:
    On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor DTC123JM, opens in a new tab
  • 1 more part has no package on record. Nothing rules them out, so they stay.
    • DTC123JE
      What it is
      Digital transistor (NPN, resistors built in)
      Maker
      JSCJ
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Digital transistor (bias resistors built in), NPN
      Source
      From the manufacturer's datasheet

      Is it dead?

      Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.

      Working, it reads

      Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.

      Dead, it reads

      • Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
      • From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
      • Base to emitter near 0 Ω: failed short.
      On the board:
      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:
      The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
      Watch for:
      On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.

      A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

      Datasheetfor DTC123JE, opens in a new tab

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