SMD code 339C
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.
339C is a capacitor marking
3.3 pF
3.3 pF capacitor
33 followed by the multiplier 9, in picofarads: 3.3 pF. Printed this way on film and larger ceramic capacitors; small chip ceramics are usually not printed at all. C is the tolerance, ±0.25 pF.
Check it with a meter
Lift one end and measure it on a capacitance range. A good one reads close to 3.3 pF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. A failed one usually reads near 0 Ω, or a steady low resistance, on the ohms range, often from a crack. On the board a shorted capacitor shorts its whole rail. A failed reading does not change what to fit: the marking still says 3.3 pF.
On a transistor or diode body (SOT-23), 339C is a part code instead. Those parts are listed below.
3 parts are printed 339C
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.
LDO regulator, all SOT-23, 3 pins. What differs:
AP8853-39CSOT-23Anwell SemiconductorAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.9V±2%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FS8853-39CCSOT-23Fortune SemiconductorFortune Semiconductor
- What it is
- LDO regulator
- Maker
- Fortune Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.9V+35mV, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FS8853-39PCSOT-23Fortune SemiconductorFortune Semiconductor
- What it is
- LDO regulator
- Maker
- Fortune Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.9V+35mV, 300mA, Pb-free
- 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.
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 339C
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.