QVxx25xHx Series 25 A High Temperature Alternistor.
Littelfuse
QV6025LH4 - 25A High Temperature Alternistor TRIAC
QVxx25xHx Series 25 A High Temperature Alternistor TRIACs Pinout Diagram TO-220 (L-Package) Tab (Isolated) TO-220 (R-Package) Tab (Non-isolated) MT2.