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SMD code 6I in SOT-323

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-323 are printed 6I

Not sure which one you have?

Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • BC818WT1SOT-323onsemiNot recordedonsemi
    What it is
    Not recorded
    Maker
    onsemi
    Package
    SOT-323
    Pins
    3
    Source
    Published code list

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

  • UNR5118SOT-323PanasonicNot recordedPanasonic
    What it is
    Not recorded
    Maker
    Panasonic
    Package
    SOT-323
    Pins
    3
    Details
    Si-pnp-Digi: Sw, 50V, 100mA, 150mW, 80MHz, R1/R2=510R/5k1
    Source
    Published code list

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

  • 3 more parts have no package on record. Nothing rules them out, so they stay.
    • UN9118Digital transistor (PNP, resistors built in), PanasonicDigital transistor (PNP, resistors built in)Panasonic
      What it is
      Digital transistor (PNP, resistors built in)
      Maker
      Panasonic
      Package
      Not recorded
      Pins
      Not recorded
      Details
      PNP transistor: Sw, 50V, 100mA, 125mW, 80MHz, R1/R2=510R/5k1
      Source
      Published code list

      Is it dead? The meter test is below: Digital transistor.

    • UN9118JPanNot recordedPan
      What it is
      Not recorded
      Maker
      Pan
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Si-pnp-Digi: Sw, 50V, 100mA, 125mW, 80MHz, R1/R2=510R/5k1
      Source
      Published code list

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

    • UNR9118JPanNot recordedPan
      What it is
      Not recorded
      Maker
      Pan
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Si-pnp-Digi: Sw, 50V, 100mA, 125mW, 80MHz, R1/R2=510R/5k1
      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.

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.

Digital transistor

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
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.

Printed with a code easy to misread as 6I

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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