SMD code S134
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.
S134 on a chip capacitor
130 nF, 75 V
130 nF, 75 V tantalum capacitor
A moulded tantalum capacitor: 134 is the capacitance in picofarads (130 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 130 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 130 nF, 75 V. Fit the same capacitance at the same or a higher voltage.
On a transistor or diode body (SMA, SMAF, SMBF), S134 is a part code instead. Those parts are listed below.
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The only part printed S134 in our tables
R1191H134B
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 13.4V±1.5%, 300mA, +CE, ECO
- Source
- Published code list
Is it dead?
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.
Was it this one?
Printed with a code easy to misread as S134
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 S134
For a marking with its end worn or burnt off. Each code has a page of its own.
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