SMD code 2553
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.
2553 on a chip resistor
255 kΩ
255 kΩ resistor, 1%
255 followed by 3 zeros. Four digits is normally the 1% series.
Check it with a meter
Lift one end and measure across it. A good one reads 255 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 255 kΩ on the board is a fault. Open, or well above 255 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 255 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 (SOT-23-6), 2553 is a part code instead. Those parts are listed below.
The only part printed 2553 in our tables
TPS2553DBV
- What it is
- Load switch
- Maker
- Texas Instruments
- Package
- SOT-23-6
- Pins
- 6
- Details
- Precision Adjustable Current-Limited Power-Distribution Switches
- Source
- From the manufacturer's datasheet
Is it dead?
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
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.