View 2sk1109 utc datasheet:

UTC K1109 JUNCTION FIELD EFFECT TRANSISTOR N-CHANNEL JFET FOR ELECTRET CONDENSER MICROPHONE 1 2 DESCRIPTION The UTC K1109 is N-channel JFET for electret condenser microphone. 3 FEATURES *High gm implies low transfer loss *Built-in gate-source diode and resistor implies fast TOP VIEW power on settling time SOT-23 1:SOURCE 2:DRAIN 3:GATE ABSOLUTE MAXIMUM RATINGS ( Operating temperature range applies unless otherwise specified ) PARAMETER SYMBOL VALUE UNIT Drain-Source Voltage VDSX 20 V Gate-Drain Voltage VGDO -20 V Drain Current ID 10 mA Gate Current IG 10 mA Total Power Dissipation PT 80 mW Junction Temperature Tj 125 °C Storage Temperature TSTG -55 ~ +125 °C ELECTRICAL CHARACTERISTICS(Tj=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP