SMD code 51R1 — 51.1 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R is the decimal point — 51.1 Ω. Parts marked this way are usually ±1% or tighter.
51R1
reads as
51.1 Ω
The same part, in bands
The through-hole version of 51.1 Ω carries 5 colour bands instead.
Everything about 51.1 Ω — power ratings, what ten cost, what is in stock.
Same value, other markings
51.1 Ω is printed several ways depending on the part's precision and size. A board can carry all of them at once.
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 489 mW | 1 W |
| 12 V | 2.82 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
76
at this value
Ten pieces
$0.14
not the reel price
Common packages
0603 · 0402 · 1206 · 0805
Codes you will mistake it for
One character apart from 51R1. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.