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SMD code 8Q in DFN

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.

1 part in DFN is printed 8Q

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.

  • RP103K311DDFNLDO regulator, RicohLDO regulatorNot recordedRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear voltage regulator IC: LDO, 3.1V±1%, 150mA, +CE, CL
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • 4 more parts have no package on record. Nothing rules them out, so they stay.
    • ADP151ACBZ-2.6-R74 pins, Analog DevicesNot recorded4 pinsAnalog Devices
      What it is
      Not recorded
      Maker
      Analog Devices
      Package
      Not recorded
      Pins
      4
      Details
      equivalent [2.6V LDO]
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • UN921LJPanNot recordedNot recordedPan
      What it is
      Not recorded
      Maker
      Pan
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Si-npn-Digi: Sw, 50V, 100mA, 125mW, 150MHz, R1/R2=4k4/4k7
      Source
      Published code list

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

    • UNR321LDigital transistor (PNP, resistors built in), PanasonicDigital transistor (PNP, resistors built in)Not recordedPanasonic
      What it is
      Digital transistor (PNP, resistors built in)
      Maker
      Panasonic
      Package
      Not recorded
      Pins
      Not recorded
      Details
      PNP transistor: Sw, 50V, 100mA, 100mW, 150MHz, R1/R2=4.7k/4.7k
      Source
      Published code list

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

    • UNR921LJPanNot recordedNot recordedPan
      What it is
      Not recorded
      Maker
      Pan
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Si-npn-Digi: Sw, 50V, 100mA, 125mW, 150MHz, R1/R2=4k4/4k7
      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.

Voltage regulator

Voltage, board powered, black probe on ground. Then ohms with the power off.

Working, it reads

Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.

Dead, it reads

  • Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  • Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  • Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.

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.

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 8Q

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes not listed here are printed on 2 more parts.

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