BF245A BF245B
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ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) (Continued)
Characteristic Symbol Min Typ Max Unit
SMALL–SIGNAL CHARACTERISTICS
Forward Transfer Admittance (VDS = 15 Vdc, VGS = 0, f = 1.0 kHz) Yfs3.0 — 6.5 mmhos
Output Admittance (VDS = 15 Vdc, VGS = 0, f = 1.0 kHz) Yos— 40 — mhos
Forward Transfer Admittance (VDS = 15 Vdc, VGS = 0, f = 200 MHz) Yfs— 5.6 — mmhos
Reverse Transfer Admittance (VDS = 15 Vdc, VGS = 0, f = 200 MHz) Yrs— 1.0 — mmhos
Input Capacitance (VDS = 20 Vdc, –VGS = 1.0 Vdc) Ciss — 3.0 — pF
Reverse Transfer Capacitance (VDS = 20 Vdc, –VGS = 1.0 Vdc, f = 1.0 MHz) Crss — 0.7 — pF
Output Capacitance (VDS = 20 Vdc, –VGS = 1.0 Vdc, f = 1.0 MHz) Coss — 0.9 — pF
Cut–of f Frequency(3) (VDS = 15 Vdc, VGS = 0) F(Yfs) — 700 — MHz
3. The frequency at which gfs is 0.7 of its value at 1 kHz.
f, FREQUENCY (MHz)
30
10
bis @ IDSS
f, FREQUENCY (MHz)
5.0
Figure 1. Input Admittance (yis) Figure 2. Reverse Transfer Admittance (yrs)
COMMON SOURCE CHARACTERISTICS
ADMITTANCE PARAMETERS
(VDS = 15 Vdc, Tchannel = 25°C)
f, FREQUENCY (MHz)
20
f, FREQUENCY (MHz)
10
Figure 3. Forward Transadmittance (yfs) Figure 4. Output Admittance (yos)
gis, INPUT CONDUCTANCE (mmhos)
20
10
0.3
0.5
0.7
1.0
2.0
3.0
5.0
7.0
20 30 50 70 100 200 300 500 700 1000
bis, INPUT SUSCEPTANCE (mmhos)
gfs, FORWARD TRANSCONDUCTANCE (mmhos)
|bfs|, FORWARD SUSCEPTANCE (mmhos)
grs, REVERSE TRANSADMITTANCE (mmhos)
brs, REVERSE SUSCEPTANCE (mmhos)
0.2
0.3
0.5
0.7
1.0
2.0
3.0
5.0
7.0
10
gos, OUTPUT ADMITTANCE (mhos)
bos, OUTPUT SUSCEPTANCE (mhos)
3.0
0.05
0.07
0.1
0.2
0.3
0.7
0.5
1.0
2.0
10 20 30 50 70 100 200 300 500 700 1000
10 20 30 50 70 100 200 300 500 700 1000 0.01
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10 20 30 50 70 100 200 300 500 7001000
bis @ 0.25 IDSS
gis @ IDSS
gis @ 0.25 IDSS
brs @ IDSS
0.25 IDSS
grs @ IDSS, 0.25 IDSS
gfs @ IDSS
|bfs| @ IDSS
|bfs| @ 0.25 IDSS
bos @ IDSS and 0.25 IDSS
gos @ IDSS
gos @ 0.25 IDSS
gfs @ 0.25 IDSS