View 2n4957 datasheet:

Data Sheet No. 2N4957Generic Part Number:Type 2N49572N4957Geometry 0006Polarity PNPREF: MIL-PRF-19500/426Qual Level: JAN - JANSFeatures: Small signal RF silicon transistordesigned for high-gain, low-noiseapplications. Housed in a TO-72 case. Also available in chip form usingthe 0006 chip geometry. The Min and Max limits shown areper MIL-PRF-19500/426 whichSemicoa meets in all cases.TO-72Maximum RatingsTC = 25oC unless otherwise specifiedRating Symbol Rating UnitCollector-Emitter Voltage VCEO 30 VCollector-Base Voltage VCBO 30 VVEBOEmitter-Base Voltage 3.0 VICCollector Current, Continuous 30 AoOperating Junction Temperature TJ -65 to +200CoStorage Temperature TSTG -65 to +200CData Sheet No. 2N4957Electrical CharacteristicsTC = 25oC unless otherwise specifiedOFF Characteristics Symbol Min Max UnitCo

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