SMD code 321 — 320 Ω
A surface-mount resistor has no bands. This one is a three-digit marking: 32 × 10¹. Parts marked this way are usually ±5% or ±2%.
321
reads as
320 Ω
Same value, other markings
320 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 | 78.1 mW | 1/4 W |
| 12 V | 450 mW | 1 W |
What you can actually get
Parts made
2
at this value
Common packages
1206
Codes you will mistake it for
One character apart from 321. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.