©
Semiconductor Components Industries, LLC, 2002
March, 2002 Rev. 0
1
Publication Order Number:
2N3819/D
2N3819
JFET VHF/UHF Amplifier
NChannel Depletion
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
DrainSource Voltage
V
DS
25
Vdc
DrainGate Voltage
V
DG
25
Vdc
GateSource Voltage
V
GS
25
Vdc
Drain Current
I
D
100
mAdc
Forward Gate Current
I
G(f)
10
mAdc
Total Device Dissipation
@ T
A
= 25
°
C
Derate above 25
°
C
P
D
350
2.8
mW
mW/
°
C
Storage Channel Temperature Range
T
stg
65 to +150
°
C
Device
Package
Shipping
ORDERING INFORMATION
2N3819
TO92
TO92
CASE 29
STYLE 22
5000 Units/Box
3
2
1
2N3819 = Device Code
Y
= Year
WW
= Work Week
MARKING DIAGRAM
2N
3819
YWW
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3 DRAIN
1 SOURCE
2
GATE
2N3819
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2
ELECTRICAL CHARACTERISTICS
(T
A
= 25
°
C unless otherwise noted)
Characteristic
Symbol
Min
Typ
Max
Unit
OFF CHARACTERISTICS
GateSource Breakdown Voltage
(I
G
= 1.0
µ
Adc, V
DS
= 0)
V
(BR)GSS
25
Vdc
GateSource
(V
DS
= 15 Vdc, I
D
= 200
µ
Adc)
V
GS
0.5
7.5
Vdc
GateSource Cutoff Voltage
(V
DS
= 15 Vdc, I
D
= 10 nAdc)
V
GS(off)
8.0
Vdc
Gate Reverse Current
(V
GS
= 15 Vdc, V
DS
= 0)
I
GSS
210
nAdc
ON CHARACTERISTICS
ZeroGateVoltage Drain Current
(V
DS
= 15 Vdc, V
GS
= 0)
I
DSS
2.0
20
mAdc
SMALLSIGNAL CHARACTERISTICS
Forward Transfer Admittance
(V
DS
= 15 Vdc, V
GS
= 0, f = 1.0 kHz)
Y
fs
3.0
6.5
mmhos
Output Admittance
(V
DS
= 15 Vdc, V
GS
= 0, f = 1.0 kHz)
Y
os
40
m
mhos
Forward Transfer Admittance
(V
DS
= 15 Vdc, V
GS
= 0, f = 200 MHz)
Y
fs
5.6
mmhos
Reverse Transfer Admittance
(V
DS
= 15 Vdc, V
GS
= 0, f = 200 MHz)
Y
rs
1.0
mmhos
Input Capacitance
(V
DS
= 20 Vdc, V
GS
= 1.0 Vdc)
C
iss
3.0
pF
Reverse Transfer Capacitance
(V
DS
= 20 Vdc, V
GS
= 1.0 Vdc, f = 1.0 MHz)
C
rss
0.7
pF
Output Capacitance
(V
DS
= 20 Vdc, V
GS
= 1.0 Vdc, f = 1.0 MHz)
C
oss
0.9
pF
Cutoff Frequency (Note 1)
(V
DS
= 15 Vdc, V
GS
= 0)
F
(Yfs)
700
MHz
1. The frequency at which g
fs
is 0.7 of its value at 1 kHz.
2N3819
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3
f, FREQUENCY (MHz)
30
10
b
is
@ I
DSS
f, FREQUENCY (MHz)
5.0
Figure 1. Input Admittance (y
is
)
Figure 2. Reverse Transfer Admittance (y
rs
)
COMMON SOURCE CHARACTERISTICS
ADMITTANCE PARAMETERS
(V
DS
= 15 Vdc, T
channel
= 25
°
C)
f, FREQUENCY (MHz)
20
f, FREQUENCY (MHz)
10
Figure 3. Forward Transadmittance (y
fs
)
Figure 4. Output Admittance (y
os
)
g is
, INPUT
CONDUCT
ANCE (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
b is
, INPUT
SUSCEPT
ANCE (mmhos)
g fs
, FOR
W
ARD
TRANSCONDUCT
ANCE (mmhos)
|b
fs|, FOR
W
ARD SUSCEPT
ANCE (mmhos)
g rs
, REVERSE
TRANSADMITT
ANCE (mmhos)
b rs
, REVERSE SUSCEPT
ANCE (mmhos)
0.2
0.3
0.5
0.7
1.0
2.0
3.0
5.0
7.0
10
g os
, OUTPUT
ADMITT
ANCE (mhos)
b os
, OUTPUT
SUSCEPT
ANCE (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
b
is
@ 0.25 I
DSS
g
is
@ I
DSS
g
is
@ 0.25 I
DSS
b
rs
@ I
DSS
0.25 I
DSS
g
rs
@ I
DSS
, 0.25 I
DSS
g
fs
@ I
DSS
|b
fs
| @ I
DSS
|b
fs
| @ 0.25 I
DSS
b
os
@ I
DSS
and 0.25 I
DSS
g
os
@ I
DSS
g
os
@ 0.25 I
DSS
g
fs
@ 0.25 I
DSS
2N3819
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5
f, FREQUENCY (MHz)
10
g
ig
@ I
DSS
f, FREQUENCY (MHz)
0.5
Figure 9. Input Admittance (y
ig
)
Figure 10. Reverse Transfer Admittance (y
rg
)
COMMON GATE CHARACTERISTICS
ADMITTANCE PARAMETERS
(V
DG
= 15 Vdc, T
channel
= 25
°
C)
f, FREQUENCY (MHz)
f, FREQUENCY (MHz)
Figure 11. Forward Transfer Admittance (y
fg
)
Figure 12. Output Admittance (y
og
)
g ig
, INPUT
CONDUCT
ANCE (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
b ig
, INPUT
SUSCEPT
ANCE (mmhos)
g fg
, FOR
W
ARD
TRANSCONDUCT
ANCE (mmhos)
b fg
, FOR
W
ARD SUSCEPT
ANCE (mmhos)
g rg
, REVERSE
TRANSADMITT
ANCE (mmhos)
b rg
, REVERSE SUSCEPT
ANCE (mmhos)
0.2
0.3
0.5
0.7
1.0
2.0
3.0
5.0
7.0
10
g og
, OUTPUT
ADMITT
ANCE (mmhos)
b og
, OUTPUT
SUSCEPT
ANCE (mmhos)
0.3
0.01
0.1
0.2
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
0.03
0.3
10
20
30
50 70 100
200 300
500 700 1000
b
ig
@ 0.25 I
DSS
b
ig
@ I
DSS
g
rg
@ 0.25 I
DSS
g
fg
@ I
DSS
g
fg
@ 0.25 I
DSS
b
rg
@ 0.25 I
DSS
b
og
@ I
DSS
, 0.25 I
DSS
g
og
@ I
DSS
g
og
@ 0.25 I
DSS
0.2
0.005
0.007
0.02
0.03
0.05
0.07
0.1
0.05
0.07
0.1
0.2
0.5
0.7
1.0
b
rg
@ I
DSS
0.25 I
DSS
g
ig
@ I
DSS
, 0.25 I
DSS
b
fg
@ I
DSS