Part Number : 2N543
Function : 45V, 25mA, NPN Transistor
Package : TO-5 Type
Maker : New Jersey Semiconductor
Pinouts : 
Description :
This transistor is a NPN silicon triode transistor designed primarily for low level, IF and RF amplifier applications in the Audio & RF frequency range for industrial service.
Features
1. Collector to Emitter Voltage : V(BR)Ceo = 45V
2. Collector to Base Voltage : V(BR)Cbo = 45V
3. Collector Current : I(C) Max. = 25mA
Datasheet PDF Download : 
Others datasheet of same file : 2N541, 2N542