SMD code 2R5 — 2.5 Ω
A surface-mount resistor has no bands. This one is a three-digit marking: the R is the decimal point — 2.5 Ω. Parts marked this way are usually ±5% or ±2%.
2R5
reads as
2.5 Ω
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 10 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 57.6 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
5
at this value
Common packages
0805 · TO-220-2 · 0402
Codes you will mistake it for
One character apart from 2R5. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.