2N4428 NPN SILICON HIGH FREQUENCY TRANSISTOR PACKAGE STYLE TO-39 DESCRIPTION: The 2N4428 is a High Frequency Transistor Designed for Amplifier and Oscillator Applications. MAXIMUM RATINGS 425 mA IC VCE 30 V PDISS 3.5 W @ TC = 25 C O O O O O TJ -65 C to +200 C TSTG -65 C to +200 C θJC 50 C/W 1 = EMITTER 2 = BASE 3 = COLLECTOR O NONE CHARACTERISTICS O TC = 25 C SYMBOL TEST CONDITIONS BVCEO IC = 20 mA BVCER IC = 20 mA BVEBO IC = 100 µA ICEX VCE = 55 V VBE = -1.5 V hFE VCE = 5.0 V IC = 50 mA IC = 400 mA ft VCE = 20 V IC = 50 mA COB VCB = 28 V f = 1.0 MHz Pin η VCC = 28 V Pout = 750 mW f = 200 MHz RBE = 10 Ω Rs = 50 Ω MINIMUM TYPICAL UNITS V 55 V 3.5 V 20 5.0 f = 200 MHz MAXIMUM 35 700 mA 200 --MHz 1000 1.5 35 A D V A N C E D S E M I C O N D U C T O R, I N C. 7525 ETHEL AVENUE • NORTH HOLLYWOOD, CA 91605 • (818) 982-1202 • FAX (818) 765-3004 Specifications are subject to change without notice. 1.0 3.5 pF 75 mW % REV. A 1/1