Document
BF988
Vishay Telefunken
N–Channel Dual Gate MOS-Fieldeffect Tetrode, Depletion Mode
Electrostatic sensitive device. Observe precautions for handling.
Applications
Input- and mixer stages especially VHF- and UHF- tuners.
Features
D D D D
Integrated gate protection diodes High cross modulation performance Low noise figure High gain
3 4 2
94 9307 96 12647
D High AGC-range D Low feedback capacitance D Low input capacitance
G2 G1
1
D
BF988 Marking: BF988 Plastic case (TO 50) 1 = Drain, 2 = Source, 3 = Gate 1, 4 = Gate 2
12623
S
Absolute Maximum Ratings
Tamb = 25_C, unless otherwise specified Parameter Drain - source voltage Drain current Gate 1/Gate 2 - source peak current Total power dissipation Channel temperature Storage temperature range Test Conditions Type Symbol Value VDS 12 ID 30 ±IG1/G2SM 10 Ptot 200 TCh 150 Tstg –55 to +150 Unit V mA mA mW °C °C
Tamb ≤ 60 °C
Maximum Thermal Resistance
Tamb = 25_C, unless otherwise specified Parameter Test Conditions Channel ambient on glass fibre printed board (40 x 25 x 1.5) mm3 plated with 35mm Cu Symbol RthChA Value 450 Unit K/W
Document Number 85007 Rev. 4, 08-Jul-99
www.vishay.de • FaxBack +1-408-970-5600 1 (8)
BF988
Vishay Telefunken Electrical DC Characteristics
Tamb = 25_C, unless otherwise specified Parameter Drain - source breakdown voltage Gate 1 - source breakdown voltage Gate 2 - source breakdown voltage Gate 1 - source leakage current Gate 2 - source leakage current Drain current Test Conditions ID = 10 mA, –VG1S = –VG2S = 4 V ±IG1S = 10 mA, VG2S = VDS = 0 ±IG2S = 10 mA, VG1S = VDS = 0 ±VG1S = 5 V, VG2S = VDS = 0 ±VG2S = 5 V, VG1S = VDS = 0 VDS = 15 V, VG1S = 0, VG2S = 4 V VDS = 15 V, VG2S = 4 V, ID = 20 mA VDS = 15 V, VG1S = 0, ID = 20 mA Type Symbol V(BR)DS ±V(BR)G1SS ±V(BR)G2SS ±IG1SS ±IG2SS BF988 BF988A BF988B IDSS IDSS IDSS –VG1S(OFF) –VG2S(OFF) 4 4 9.5 Min 12 7 7 Typ Max Unit V V V nA nA mA mA mA V V
14 14 50 50 18 10.5 18 2.5 2.0
Gate 1 - source cut-off voltage Gate 2 - source cut-off voltage
Electrical AC Characteristics
VDS = 8 V, ID = 10 mA, VG2S = 4 V, f = 1 MHz , Tamb = 25_C, unless otherwise specified Parameter Forward transadmittance Gate 1 input capacitance Gate 2 input capacitance Feedback capacitance Output capacitance Power gain Test Conditions Type Symbol y21s Cissg1 Cissg2 Crss Coss Gps Gps Min 21 Typ 24 2.1 1.2 25 1.05 28 20 Max 2.5 Unit mS pF pF fF pF dB dB dB 1 1.5 dB dB
VG1S = 0, VG2S = 4 V
AGC range Noise figure
GS = 2 mS, GL = 0.5 mS, f = 200 MHz GS = 3,3 mS, GL = 1 mS, f = 800 MHz VG2S = 4 to –2 V, f = 800 MHz GS = 2 mS, GL = 0.5 mS, f = 200 MHz GS = 3,3 mS, GL = 1 mS, f = 800 MHz
16.5 40
DGps
F F
www.vishay.de • FaxBack +1-408-970-5600 2 (8)
Document Number 85007 Rev. 4, 08-Jul-99
BF988
Vishay Telefunken Common Source S–Parameters
VDS , = 8 V , VG2S = 4 V , Z0 = 50 W, Tamb = 25_C, unless otherwise specified S11 LOG MAG dB –0.02 –0.10 –0.31 –0.56 –0.87 –1.26 –1.59 –2.04 –2.42 –2.88 –3.39 –3.94 –4.46 –0.02 –0.11 –0.35 –0.62 –0.97 –1.39 –1.76.