This part is a kind of semiconductor called MRF237.

Function of this product has HIGH FREQUENCY TRANSISTOR.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

MAXIMUM RATINGS Rating Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current Continuous @Total Device Dissipation Tq = 25°C Derate above 25°C Storage Temperature THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Case Symbol v CEO v CBO VEBO •c PD Tstg Value 18 36 4.0 640 8.0 45.7 - 65 to + 200 Unit Vdc Vdc Vdc mAdc Watts mW/°C °C Symbol Rajc Max ' 20 Unit °C/W MRF237 CASE 79-03, STYLE 5 HIGH FREQUENCY TRANSISTOR NPN SILICON ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted.) Characteristic OFF CHARACTERISTICS Collector-Emitter Breakdown Voltage c(l = 10 mAdc, Bl = 0) Collector-Emitter Breakdown Voltage c(l = 5.0 mAdc, Vbe = 0) Emitter-Base Breakdown Voltage (IE = 1.0 mAdc, lc = 0) Collector Cutoff Current [ ... ]

MRF237 PDF Datasheet Download