The 6PT series of silicon controlled rectifiers are high performance glass passivated technology, and are designed for power supply up to 400Hz on resistive or inductive load. A K A G TO-251 (I-PAK) (6PTxxF) A A KA G TO-252 (D-PAK) (6PTxxG) K AG KAG TO-220AB (Non-lnsulated) (6PTxxA) TO-220AB (.