I have some old TO-92 transistors. Some have color bands/bars behind its face/marking.
For example I have 2N4401 manufactured around 1988 and I am writing their markings and different color bands here (All have N's logo, it means all these were manufactured by National semiconductor):
- Marking: "428 2N4401" & color bands: "blue-red-yellow" (bottom to top) I don't know where to start see bands- top to button or button to top.
- Marking: "428 2N4401" & color bands: "violet-red-yellow" (bottom to top)
- Marking: "416 2N4401" & color bands: "yellow-brown-yellow" (bottom to top)
These bands are mysterious to me. Can any one decode it? (I see no such bands in new parts)
For example I have 2N4401 manufactured around 1988 and I am writing their markings and different color bands here (All have N's logo, it means all these were manufactured by National semiconductor):
- Marking: "428 2N4401" & color bands: "blue-red-yellow" (bottom to top) I don't know where to start see bands- top to button or button to top.
- Marking: "428 2N4401" & color bands: "violet-red-yellow" (bottom to top)
- Marking: "416 2N4401" & color bands: "yellow-brown-yellow" (bottom to top)
These bands are mysterious to me. Can any one decode it? (I see no such bands in new parts)
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