SMD code 39R0 — 39 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R is the decimal point — 39.0 Ω. Parts marked this way are usually ±1% or tighter.
39R0
reads as
39 Ω
The same part, in bands
The through-hole version of 39 Ω carries 4 colour bands instead.
Everything about 39 Ω — power ratings, what ten cost, what is in stock.
Same value, other markings
39 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 | 641 mW | 2 W |
| 12 V | 3.69 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
188
at this value
Ten pieces
$0.18
not the reel price
Common packages
0805 · 1206 · 0603 · 0402
Codes you will mistake it for
One character apart from 39R0. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.