Databook.fxp 1/13/99 2:09 PM Page B-61 B-61 01/99 J308, J309 N-Channel Silicon Junction Field-Effect Transistor Absolute maximum ratings at TA = 25¡C ¥ Mixers ¥ Oscillators ¥ VHF/UHF Amplifiers Reverse Gate Source & Reverse Gate Drain Voltage Continuous Forward Gate Current Continuous Device Power Dissipation Power Derating J308 At 25°C free air temperature: Static Electrical Characteristics Gate Source Breakdown Voltage Min V(BR)GSS Gate Reverse Current IGSS Gate Source Cutoff Voltage VGS(OFF) Gate Source Forward Voltage VGS(F) Drain Saturation Current (Pulsed) IDSS Typ J309 Max – 25 Min Typ Process NJ72 Max Unit V IG = – 1µA, VDS = ØV –1 nA VGS = – 15V, VDS = ØV – 25 –1 –1 –1 – 6.5 12 60 – 25 V 10 mA 360 mW 3.27 mW/°C Test Conditions –1 µA VGS = – 15V, VDS = ØV –1 –4 V VDS = 10V, ID = 1 nA 1 V VDS = ØV, IG = 1 mA 12 30 mA VDS = 10V, VGS = ØV µS VDS = 10V, ID = 10 mA f = 1 kHz 250 µS VDS = 10V, ID = 10 mA f = 1 kHz 1 TA = +125°C Dynamic Electrical Characteristics Common Source Forward Transconductance g fs Common Source Output Conductance g os Common Gate Forward Transconductance g fg 13000 13000 µS VDS = 10V, ID = 10 mA f = 1 kHz Common Gate Output Transconductance g og 150 100 µS VDS = 10V, ID = 10 mA f = 1 kHz Gate Drain Capacitance Cdg 1.8 2.5 1.8 2.5 pF VDS = ØV, VGS = – 10V f = 1 MHz Gate Source Capacitance Cgs 4 5 4 5 pF VDS = ØV, VGS = – 10V f = 1 MHz Equivalent Short Circuit Input Noise Voltage e¯ N 10 10 nV/√Hz VDS = 10V, ID = 10 mA f = 100 kHz Common Source Forward Transconductance Re(Yfs) 12 12 µS VDS = 10V, ID = 10 mA f = 105 MHz Common Gate Input Conductance Re(Yig) 14 14 µS VDS = 10V, ID = 10 mA f = 105 MHz Common Source Input Conductance Re(Yis) 0.4 0.4 µS VDS = 10V, ID = 10 mA f = 105 MHz Common Source Output Conductance Re(Gos) 0.15 0.15 µS VDS = 10V, ID = 10 mA f = 105 MHz 16 16 dB VDS = 10V, ID = 10 mA f = 105 MHz Common Gate Power Gain at Noise Match Noise Figure Gpg NF 8000 17000 10000 17000 250 11 11 dB VDS = 10V, ID = 10 mA f = 450 MHz 1.5 1.5 dB VDS = 15V, ID = 10 mA f = 105 MHz 2.7 2.7 dB VDS = 15V, ID = 10 mA f = 450 MHz TOÐ226AA Package Surface Mount Dimensions in Inches (mm) SMPJ308, SMPJ309 Pin Configuration 1 Drain, 2 Source, 3 Gate www.interfet.com 1000 N. Shiloh Road, Garland, TX 75042 (972) 487-1287 FAX (972) 276-3375