Your circuit needs more headroom than a standard SCR gives you, and that mounting tab can't be tied to a pin. The BT137X delivers 600V and 8A in a bidirectional package. It's isotab — the metal mounting tab is electrically isolated from all pins, so you can bolt it to a heatsink without creating an unwanted connection. Three terminals, both AC half-cycles handled
| brand | JAYCAR |
| type | BT137X |
| voltage_rating | 600V |
| current_rating | 8A |
| device_type | TRIAC (bidirectional, isotab) |
| terminals | 3 |
| mounting_tab | Isotab (not connected to pins) |
| category | ELECTRONICS & COMPONENTS |
| subcategory | ELECTRONIC COMPONENTS |
