ST631K - LOW VOLTAGE PNP POWER TRANSISTOR
The ST631K is manufactured by low voltage Epitaxial Base technology and it is housed in SOT-32 plastic package.
The complementary PNP type is ST600K.
SOT-32 (TO-216) Internal Schematic Diagram Order Codes Part Number ST600K Marking 631K Package SOT-32 Packing TUBE August 2005 This is preliminary