View 2sk208 datasheet:

2SK208 TOSHIBA Field Effect Transistor Silicon N Channel Junction Type 2SK208 General Purpose and Impedance Converter and Unit: mm Condenser Microphone Applications • High breakdown voltage: VGDS = -50 V • High input impedance: I = -1.0 nA (max) (V = -30 V) GSS GS • Low noise: NF = 0.5dB (typ.) (R = 100 k?, f = 120 Hz) G • Small package. Maximum Ratings (Ta = = 25°C) = = Characteristics Symbol Rating Unit Gate-drain voltage VGDS -50 V Gate current IG 10 mA Drain power dissipation PD 100 mW Junction temperature Tj 125 °C Storage temperature range Tstg -55~125 °C JEDEC TO-236MOD JEITA SC-59 TOSHIBA 2-3F1B Electrical Characteristics (Ta = = 25°C) = = Weight: 0.012 g (typ.) Characteristics Symbol Test Condition Min Typ. Max Unit Gate cut-off curren