General > General Technical Chat

Is there a meaning to colors on a transitor?

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Benta:
MPSA06... I remember those.
You have two different things here:
1: the thin horizontal stripes are production codes for lot/year/week whatever. Done by Motorola.
2: the "colour blobs" can be anything, but certainly not OEM.

Kleinstein:
Japanese JFETs (e.g. 2SK...) often come with IDSS grading via a color code, even with the same system used on different parts. With modern part the color may have changed to a letter code representing the color (e.g. R, O  Y GR BL ) not just for ordering.

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