5 band resistor color code does not work

i have a resistor with 5 bands wide brown, standard black, gold, gold then blue. i can not find a break out for this coding. thank you

@ blackrock13


That might be a four-band, wire-wound resistor at 1 Ohm, 5% tolerance, with a fifth band for a specific purpose. Try the Resistor Color Code Calculator, again, with brown, black, gold, and gold in the 4-Band mode.

Next, look at some of these 1 Ohm, 5% resistors. Note that part number PNP300JR-73-1R has a violet band as defined on page 01 of its PNP datasheet (a style code). Part number FKN50SJR-52-1R has a white band for a different style code–again on page 01 of its FKN datasheet.

There can be other definitions for the fifth band. A ppm temperature coefficient value is an example.

thank you for the information i should have stated the resistor is a standard carbon resistor.
these resistors were used in the 70’s and 80’s
i tried to load a picture but it will not load.

@ blackrock13

I settled on wire-wound because sometimes the wide band indicates that composition. The same color band code may apply, though, because I came across references to older resistors having a fifth band that indicated something other than the preceding resistance, multiplier, and tolerance.

Here is one example:

Most guides indicate that the blue band would be +/- 10ppm, but I didn’t find any type at 1 Ohm, 5%, and 10ppm or better, including these 1 Ohm, 5% Carbon products. Other sources suggest that the fifth band could be a failure rate. That was common for resistors used for military applications.

In any case, I haven’t found another explanation other than a 4-Band code with a unique fifth band.

thank you very much

I wanted to mention, too, that photos usually load into a forum post by dragging/dropping a file from your device. I don’t recall the size limit, but if you have the file saved anywhere, it should transfer to the text area. Copy/pasting may also work.

This also explains it for future reference!

1 Like