SMD code R100 — 0.1 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R leads, so the value is below 1 Ω — 0.100 Ω. Parts marked this way are usually ±1% or tighter.
R100
reads as
0.1 Ω
The same part, in bands
The through-hole version of 0.1 Ω carries 4 colour bands instead.
Everything about 0.1 Ω — power ratings, what ten cost, what is in stock.
Same value, other markings
0.1 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 | 250 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 1440 W | no standard part — needs a power resistor or a heatsink |
Codes you will mistake it for
One character apart from R100. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.