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SMD code S64 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.

1 part in SOT-323 is printed S64

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.

  • FJX4014RSOT-323Digital transistor (PNP, resistors built in), 3 pins, Fairchild SemiconductorDigital transistor (PNP, resistors built in)3 pinsFairchild Semiconductor
    What it is
    Digital transistor (PNP, resistors built in)
    Maker
    Fairchild Semiconductor
    Package
    SOT-323
    Pins
    3
    Details
    PNP transistor: Sw, 50V, 100mA, 200mW, R1/R2=4.7k/4.7k
    Source
    Published code list

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

  • 4 more parts have no package on record. Nothing rules them out, so they stay.
    • ECL112135BFRLDO regulator, E-CMOSLDO regulatorNot recordedE-CMOS
      What it is
      LDO regulator
      Maker
      E-CMOS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 3.5V±2%, 250mA
      Source
      Published code list

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

    • LN1130P352VRLDO regulator, Shanghai Natlinear ElectronicsLDO regulatorNot recordedShanghai Natlinear Electronics
      What it is
      LDO regulator
      Maker
      Shanghai Natlinear Electronics
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 3.5V±2%, 300mA
      Source
      Published code list

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

    • S-1721A1829-I6T16 pins, ABLICNot recorded6 pinsABLIC
      What it is
      Not recorded
      Maker
      ABLIC
      Package
      Not recorded
      Pins
      6
      Details
      equivalent [1.8/2.9V Dual LDO]
      Source
      Published code list

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

    • S-1721A1829-I6T1xLDO regulator, Seiko InstrumentsLDO regulatorNot recordedSeiko Instruments
      What it is
      LDO regulator
      Maker
      Seiko Instruments
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/2.9V±1.0%, 150mA, +CE, PDR
      Source
      Published code list

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

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.

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.

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.

Printed with a code easy to misread as S64

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 S64

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

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