What value resistor is this?

Question

I'd like to change this resistor from a main board but I'm not sure about its value.

It's marked as 0.2R in the datasheet (so 0.2 Ω) but following the color code it should be 22.88 Ω.

Am I right or I'm missing something? Also, how can I know the right power rating?

Does this answer your question? Identifying a resistor with a weird band combination.
Based on that, 0.22R 5% 20ppm/k — Tom Carpenter, Jul 04 '22 at 22:03
@Elementronics According to wikipedia: resistances less than 10 Ω have 'R' to indicate the position of the decimal point (radix point). For example: 0R22 = 0.22 Ω. So why it's marked as 0.2R in the datasheet? — anemiCCinema, Jul 05 '22 at 11:57
@anemiCCinema They usually do, but they didn't in this case for whatever reason. I don't think anyone but the datasheet writer could tell you why. — Hearth, Jul 05 '22 at 14:20

score 4 · Answer 1 · answered Jul 04 '22 at 22:05

4

The colour bands red-red-silver indicate it's a 0.22 ohm resistor.

Gold band means 5% tolerance.

The green means it's somehow special.

It may indicate a certain temperature coefficient.

It may indicate it's a fusible resistor which is designed to fail open under overload conditions.

It may indicate it's a non-inductive resistor if it is important to the application.

It may indicate a certain level of failure rate requirement.

If the resistor is OK, there is no need to change it.

answered Jul 04 '22 at 22:05

Justme

So if i understand well the gold band is the clue to know that it's not a 5 band resistor but a 4 band resistor with an unknown band color, maybe a temperature coefficient? Also it seems to me that the surface of the resistor is slightly damaged. for now it works but I would like to change it to prevent it from burning and damaging other components of the board. I have another board like this where many SMD components got damaged afterwards that it blown. – anemiCCinema Jul 05 '22 at 11:54
Are you sure it's not the other way around, that other components being damaged caused the resistor to pass too much current so it overheated and got damaged? – Justme Jul 05 '22 at 12:12

1 Answers1