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| DATA SHEET CM4957 PNP HIGH FREQUENCY SILICON TRANSISTOR TO-72 CASE DESCRIPTION The CENTRAL SEMICONDUCTOR CM4957 is a Silicon PNP RF Transistor, mounted in a hermetically sealed package, designed for high frequency amplifier and non-saturated switching applications. This device is a replacement for the 2N4957. MAXIMUM RATINGS (TA=25C) Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current - Continuous Power Dissipation Power Dissipation (TC=25C) Operating and Storage Junction Temperature SYMBOL VCBO VCEO VEBO IC PD PD TJ,Tstg 30 25 3.0 30 200 300 -65 to +200 UNITS V V V mA mW mW C ELECTRICAL CHARACTERISTICS (TA=25C unless otherwise noted) SYMBOL ICBO BVCBO BVCEO BVEBO hFE fT Ccb hfe Gpe TEST CONDITIONS VCB=10V IC=100A IC=1.0mA IE=100A VCE=10V, IC=2.0mA VCE=10V, IC=2.0mA, f=100MHz VCB=10V, IE=0, f=1.0MHz VCE=10V, IC=2.0mA, f=1.0kHz VCE=10V, IC=4.0mA, f=450MHz MIN 30 25 3.0 20 1200 1.6 20 17 TYP MAX 100 UNITS nA V V V MHz pF dB 150 2500 2.0 200 25 (Continued) R2 CM4957 PNP HIGH FREQUENCY TRANSISTOR TO-72 CASE - MECHANICAL OUTLINE A B D C E DIMENSIONS INCHES MILLIMETERS SYMBOL MIN MAX MIN MAX A (DIA) 0.209 0.230 5.31 5.84 B (DIA) 0.175 0.195 4.45 4.95 C 0.030 0.76 D 0.170 0.210 4.32 5.33 E 0.500 12.70 F (DIA) 0.016 0.019 0.41 0.48 0.100 2.54 G (DIA) 0.050 1.27 H J 0.036 0.046 0.91 1.17 K 0.028 0.048 0.71 1.22 TO-72 (REV: R1) F LEAD #2 LEAD #1 G H LEAD #3 LEAD #4 J 45 K R1 Lead Code: 1) Emitter 2) Base 3) Collector 4) Case |
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