MPF102 Overview:

The MPF102 is a N-channel JFET (Junction Field-Effect Transistor) used mainly for:
Low-noise audio applications
RF amplifiers
Switching circuits

Specifications:

Parameter    Value
Type    N-Channel JFET
Package    TO-92 (plastic)
Maximum Drain-Source Voltage (VDS)    25V
Gate-Source Voltage (VGS)    ±25V
Drain Current (IDSS)    2 mA to 20 mA (typical)
Gate Cutoff Voltage (VGS(off))    -0.5V to -8.0V
Power Dissipation (PD)    310 mW
Input Capacitance (Ciss)    ~4 pF (typical)
Noise Figure    Very low (good for RF & audio work)
Operating Temperature    -65°C to +150°C