Cross Reference BUT21B
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| Part Number | Replace Part | Summary | Case | Pinout |
|---|---|---|---|---|
| BUT21B NPN Silicon |
BUT12(A), BUT56(A) BUT12A |
750/400V, 5A, 100W |  |
 |
| BUT21BF NPN Silicon |
BUT11(A)F, BUT12(A)F, BUT18(A)F BUT12AF |
=BUT 21B, , 20W | |
 |