SMD code 4210 — 421 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: 421 × 10⁰. Parts marked this way are usually ±1% or tighter.
4210
reads as
421 Ω
How much it can take
| Across it | Dissipated | Smallest package that copes |
|---|---|---|
| 5 V | 59.4 mW | 1/8 W |
| 12 V | 342 mW | 1 W |
What you can actually get
Parts made
1
at this value
Common packages
Codes you will mistake it for
One character apart from 4210. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.