SMD code 1R8 — 1.8 Ω
A surface-mount resistor has no bands. This one is a three-digit marking: the R is the decimal point — 1.8 Ω. Parts marked this way are usually ±5% or ±2%.
1R8
reads as
1.8 Ω
The same part, in bands
The through-hole version of 1.8 Ω carries 4 colour bands instead.
Everything about 1.8 Ω — power ratings, what ten cost, what is in stock.
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 13.9 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 80 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
117
at this value
Ten pieces
$0.26
not the reel price
Common packages
0805 · 0603 · 1206 · 1210
Codes you will mistake it for
One character apart from 1R8. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.