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SMD code S514

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.

S514 on a chip capacitor

510 nF, 75 V

510 nF, 75 V tantalum capacitor

A moulded tantalum capacitor: 514 is the capacitance in picofarads (510 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 510 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 510 nF, 75 V. Fit the same capacitance at the same or a higher voltage.

On a transistor or diode body (SMA, SMAF, SMB), S514 is a part code instead. Those parts are listed below.

4 parts are printed S514

Not sure which one you have?

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

TVS diode, all SMA, 2 pins, all EIC Semiconductor.

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.

TVS or ESD protection diode

Diode range, from the protected line to ground, part lifted if you can.

Working, it reads

A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

Dead, it reads

  • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  • A reading both ways on a one-way part: leaky.
  • A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

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 S514

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 S514

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.