SMD code 5R1 — 5.1 Ω
A surface-mount resistor has no bands. This one is a three-digit marking: the R is the decimal point — 5.1 Ω. Parts marked this way are usually ±5% or ±2%.
5R1
reads as
5.1 Ω
The same part, in bands
The through-hole version of 5.1 Ω carries 4 colour bands instead.
Everything about 5.1 Ω — power ratings, what ten cost, what is in stock.
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 4.9 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 28.2 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
121
at this value
Ten pieces
$0.23
not the reel price
Common packages
1206 · 0805 · 0603 · 0402
Codes you will mistake it for
One character apart from 5R1. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.