This is a kind of semiconductor, BY407A Datasheet PDF learn more.
Part number : BY407A
Functions : 600V, 0.8A, Rectifier (Diode)
Package information : F126, CB-210 Lead Type
Manufacturer : Thomson-CSF
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The texts in the PDF file :
Fast Recovery rectifier diode
1. Io = 0.8 A
2. Vrrm = 660 V
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Other data sheets within the file : BA157, BA158, BA159, PY206, PY207, BY406A