Contextual Info: SANYO SEMICONDUCTOR 2SA1581, 2SC4112 CORP 25E D TTTTQTh 0QQ73S0 T r -3 7 - / 3 4 k T-3S-I P N P / N P N Epitaxial P lanar S ilic o n Tran sistors 2o isa Switching Applications with Bias R e s i s t a n c e R 1 = 2 . 2 k ß ) @2525 Applications . Switching circuit, inverter circuit, interface circuit, driver circuit