View st280s datasheet:

Bulletin I25161 rev. B 01/94 ST280S SERIES PHASE CONTROL THYRISTORS Stud Version Features 280A Center amplifying gate Hermetic metal case with glass-metal seal insulator International standard case TO-209AB (TO-93) Threaded studs UNF 3/4 - 16UNF2A or ISO M16x1.5 Compression Bonded Encapsulation for heavy duty operations such as severe thermal cycling Typical Applications DC motor contr

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BJT: SBT42 | 2SA200-Y | 2SA200-O | 2SD882-Q | 2SD882-P | 2SD882-E | 2SC945-L | 2SC945-H | 2SC4226-R23 | 2SC3357-F | 2SC3357-E | 2SC3356-R26 | 2SC3356-R24 | 2SC3356-R23 | 2SB772-Q | 2SB772-P | 2SB772-E | 2SA1015-L | 2SA1015-H | HSS8550 | HSS8050