SMD code 3R30 — 3.3 Ω
A surface-mount resistor has no bands. This one is a four-digit marking: the R is the decimal point — 3.30 Ω. Parts marked this way are usually ±1% or tighter.
3R30
reads as
3.3 Ω
The same part, in bands
The through-hole version of 3.3 Ω carries 4 colour bands instead.
Everything about 3.3 Ω — power ratings, what ten cost, what is in stock.
Same value, other markings
3.3 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 | 7.58 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 43.6 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
128
at this value
Ten pieces
$0.29
not the reel price
Common packages
1206 · 0805 · 0402 · 0603
Codes you will mistake it for
One character apart from 3R30. On a 0402 part these are a fraction of a millimetre of printing — worth a second look before you solder.