SMD code 31R2 — 31.2 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R is the decimal point — 31.2 Ω. Parts marked this way are usually ±1% or tighter.
31R2
reads as
31.2 Ω
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 801 mW | 2 W |
| 12 V | 4.62 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
2
at this value
Common packages
1206
Codes you will mistake it for
One character apart from 31R2. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.