BF998B-GS08 Vishay, BF998B-GS08 Datasheet - Page 5

• Manufacturer Part Number: BF998B-GS08
• Manufacturer: Vishay

Specifications of BF998B-GS08

• Application: UHF
• Channel Type: N
• Channel Mode: Depletion
• Continuous Drain Current: 0.03A
• Drain Source Voltage (max): 12V
• Power Gain (typ)@vds: 28@8VdB
• Noise Figure (max): 1.5(Typ)dB
• Package Type: SOT-143
• Pin Count: 3 +Tab
• Forward Transconductance (typ): 0.024S
• Input Capacitance (typ)@vds: 2.1@8V@Gate 1/1.1@8V@Gate 2pF
• Output Capacitance (typ)@vds: 1.05@8VpF
• Reverse Capacitance (typ): 0.025@8VpF
• Operating Temp Range: -65C to 150C
• Mounting: Surface Mount
• Number Of Elements: 1
• Power Dissipation (max): 200mW
• Screening Level: Military
• Lead Free Status / Rohs Status: Compliant

V
S
Document Number 85011
Rev. 1.6, 31-Aug-05
DS
11
12818
12819
12820
= 8 V, I
Figure 7. Transducer Gain vs. Gate 1 Source Voltage
Figure 8. Forward Transadmittance vs. Drain Current
–10
–20
–30
–40
–50
32
28
24
20
16
12
20
18
16
14
12
10
10
8
4
0
8
6
4
2
0
0
–1.0
0
0
f = 800 MHz
V
Figure 9. Short Circuit Input Admittance
f = 1 MHz
DS
100 MHz
D
4
0
2
400 MHz
V
–0.5
= 8 V
= 10 mA, V
G1S
I
700 MHz
8
D
– Gate 1 Source Voltage ( V )
4
– Drain Current ( mA )
Re (y
0.0
12
f = 1300 MHz
6
11
1000 MHz
1 V
) ( mS )
f = 100...1300 MHz
16
8
G2S
0.5
I
V
V
D
V
G2S
DS
20
= 10 mA
G2S
10
= 4 V, Z
V
= 8 V
= 4 V
G2S
1.0
= –0.8 V
24
12
–0.2 V
–0.4 V
= 4 V
2 V
3 V
4 V
3 V
1 V
2 V
0
1.5
28
14
0
= 50 Ω
BF998 / BF998R / BF998RW
12821
12822
Figure 10. Short Circuit Forward Transfer Admittance
–10
–15
–20
–25
–30
–35
–40
–5
5
0
9
8
7
6
5
4
3
2
1
0
0.00
0
Figure 11. Short Circuit Output Admittance
f = 100...1300 MHz
20 mA
4
100 MHz
V
0.25
V
G2S
DS
10 mA
I
= 8 V
8
400 MHz
D
= 4 V
1300 MHz
= 5 mA
0.50
f = 1300 MHz
12
Re (y
Re (y
700 MHz
0.75
16
21
22
Vishay Semiconductors
) ( mS )
) ( mS )
f = 100...1300 MHz
1000 MHz
20
1000 MHz
1.00
V
V
I
D
DS
G2S
f = 100 MHz
=10 mA
24
= 15 V
= 4 V
700 MHz
400 MHz
1.25
28
1.50
32
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