SMD marking
25C
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.
25C on a chip resistor
17.8 kΩ
17.8 kΩ resistor, 1%
EIA-96 precision code: 25 selects 1.78 from the E96 series and C multiplies by 10000. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 17.8 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 17.8 kΩ on the board is a fault. Open, or well above 17.8 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 17.8 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (WSON), 25C is a part code instead. Those parts are listed below.
The only part printed 25C in our tables
BC817DPN-25
- What it is
- Transistor
- Maker
- Panjit
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Bipolar transistor
- Source
- From the manufacturer's datasheet
Is it dead?
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- On the board:
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
1 more part has a code that begins with 25C
Codes that begin with 25C
For a marking with its end worn or burnt off. Each one shows its full printed code.
INA2180A3IDSGprinted 25GYWSONCurrent sense amplifier, 8 pins, Texas InstrumentsCurrent sense amplifierWSON8 pinsTexas Instruments
Printed 25GY. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
- What it is
- Current sense amplifier
- Maker
- Texas Instruments
- Package
- WSON
- Pins
- 8
- Details
- INAx180 Low- and High-Side Voltage Output, Current-Sense Amplifiers
- Source
- From the manufacturer's datasheet
Is it dead?
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.
Open this in the search to correct a character or try another package.