Re: Motorola transistor colour code?
It would probably be customer driven. A board full of TO-92 devices differing in polarity, gain, ft, etc. would be impossible to check quickly on final assembly inspection. The stripes make this easier. Of the devices for which I was responsible, in-house coding and the strict defining of other seldom specified parameters such as solderability was the norm.
It's the only way to make a decent product of lasting usefulness.
Leon.
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