First line: 9000, 9001 9002, Powerlithic series silicon darlington transistors designed high voltage, high speed, high power switching applications. These high voltage darlington transistors ideally suited applications switching power supplies, pulse-width-modulated regulators inverter converter circuits operatAbstract: .. Series PTC 9000, PTC9001, PTC 9002 NPN Silicon Power Dorlington Transistors 20 Amperes †¢ 750, 850 and 900 Volts FEATURES †¢ High Voltage Rating - 900 Volts Sustaining †¢ Fast-Switching Capabilities .. Tags: datasheet abstract..