SMD code 397
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.
397 on a chip capacitor
390 µF
390 µF capacitor
39 followed by the multiplier 7, in picofarads: 390 µF. Printed this way on film and larger ceramic capacitors; small chip ceramics are usually not printed at all.
Check it with a meter
Lift one end and measure it on a capacitance range. A good one reads close to 390 µF. 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 390 µF.
On a transistor or diode body (SOT-23-5, SOT-23, SOT-143), 397 is a part code instead. Those parts are listed below.
2 parts are printed 397
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
Voltage supervisor. What differs:
LN3526N3952MSOT-1434 pins, Shanghai Natlinear ElectronicsSOT-1434 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-143
- Pins
- 4
- Details
- Voltage detector IC: 3.9V±2%, -Reset ODO, -MR, 50ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6104B538MRSOT-23-55 pins, TorexSOT-23-55 pinsTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS-IC: VDet 3.8V, 5%, Hst, ±Reset PPO, Wt=400ms, Rt=25ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
Integrated circuit
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
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 397
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 397
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.