SMD code 401 — 400 Ω
A surface-mount resistor has no bands. This one is a three-digit marking: 40 × 10¹. Parts marked this way are usually ±5% or ±2%.
401
reads as
400 Ω
Same value, other markings
400 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 | 62.5 mW | 1/8 W |
| 12 V | 360 mW | 1 W |
What you can actually get
Parts made
1
at this value
Common packages
0402
Codes you will mistake it for
One character apart from 401. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.