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SMD code S104

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.

S104 on a chip capacitor

100 nF, 75 V

100 nF, 75 V tantalum capacitor

A moulded tantalum capacitor: 104 is the capacitance in picofarads (100 nF) and S is the rated-voltage code (75 V). S for 75 V is Vishay's code; other makers' ranges stop at 50 V.

Check it with a meter

Lift one end and measure it on a capacitance range. A good one reads close to 100 nF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. It is polarised: the band on the body marks the positive end, and a tantalum fitted backwards fails short, sometimes with a flame. A failed tantalum usually reads near 0 Ω both ways, often with a burnt or cracked body. A failed reading does not change what to fit: the marking still says 100 nF, 75 V. Fit the same capacitance at the same or a higher voltage.

On a transistor or diode body (SOIC-8, SMC, SOT-89-5), S104 is a part code instead. Those parts are listed below.

3 parts are printed S104

Not sure which one you have?

Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • SM1040CSMCSchottky diode, 2 pins, LRCSchottky diodeSMC2 pinsLRC
    What it is
    Schottky diode
    Maker
    LRC
    Package
    SMC
    Pins
    2
    Details
    Schottky diode, VR 40 V, IF 10 A, VF Max 0.55 V
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: Schottky diode.

    Datasheetfor SM1040C, opens in a new tab
  • R1191H104BSOT-89-5LDO regulator, 5 pins, RicohLDO regulatorSOT-89-55 pinsRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    SOT-89-5
    Pins
    5
    Details
    Linear voltage regulator IC: LDO, 10.4V±1.5%, 300mA, +CE, ECO
    Source
    Published code list

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

  • 1 more part has no package on record
    • SS10P4Schottky diode, VishaySchottky diodeNot recordedNot recordedVishay
      What it is
      Schottky diode
      Maker
      Vishay
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Diode: SBR, 40V, 10A, Vf<0.56V(10A)
      Source
      Published code list

      Is it dead? The meter test is below: Schottky diode.

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.

Schottky diode

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
  • A reading the wrong way round as well: leaky.
  • 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.

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.

Codes that begin with S104

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

Did you find your part?

Open this in the search to correct a character or try another package.