SMD code 4R00 — 4 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R is the decimal point — 4.00 Ω. Parts marked this way are usually ±1% or tighter.
4R00
reads as
4 Ω
Same value, other markings
4 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 | 6.25 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 36 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
6
at this value
Common packages
TO-220-2 · 2515 · 2817
Codes you will mistake it for
One character apart from 4R00. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.