Data Sheet

J111 J112 J113
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3
r
ds(on)
, DRAIN-SOURCE ON-STATE
RESISTANCE (OHMS)
NOTE 2
The Zero–Gate–Voltage Drain Current (I
DSS
), is the principle de-
terminant of other J-FET characteristics. Figure 10 shows the
relationship of Gate–Source Off Voltage (V
GS(off)
and Drain–
Source On Resistance (r
ds(on)
) to I
DSS
. Most of the devices will
be within ±10% of the values shown in Figure 10. This data will
be useful in predicting the characteristic variations for a given
part number.
For example:
Unknown
r
ds(on)
and V
GS
range for an J112
The electrical characteristics table indicates that an J112 has
an I
DSS
range of 25 to 75 mA. Figure 10, shows r
ds(on)
= 52 Ohms
for I
DSS
= 25 mA and 30 Ohms for I
DSS
= 75 mA. The corre-
sponding V
GS
values are 2.2 volts and 4.8 volts.
y
fs
, FORWARD TRANSFER ADMITTANCE (mmho
s
C, CAPACITANCE (pF)
r
ds(on)
, DRAIN-SOURCE ON-STATE
RESISTANCE (OHMS)
r
ds(on)
, DRAIN-SOURCE ON-STATE
RESISTANCE (NORMALIZED)
2.0
3.0
5.0
7.0
10
20
0.5 0.7 1.0 2.0 3.0 5.0 7.0 10 20 30 50
I
D
, DRAIN CURRENT (mA)
Figure 6. Typical Forward Transfer Admittance
1.0
1.5
2.0
3.0
5.0
7.0
10
15
0.03 0.05 0.1 0.3 0.5 1.0 3.0 5.0 10 30
V
R
, REVERSE VOLTAGE (VOLTS)
Figure 7. Typical Capacitance
200
160
120
80
40
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
V
GS
, GATE-SOURCE VOLTAGE (VOLTS)
Figure 8. Effect of Gate–Source Voltage
On Drain–Source Resistance
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
-70 -40 -10 20 50 80 110 140 170
T
channel
, CHANNEL TEMPERATURE (°C)
Figure 9. Effect of Temperature On
Drain–Source On–State Resistance
J113
J112
J111
T
channel
= 25°C
V
DS
= 15 V
C
gs
C
gd
T
channel
= 25°C
(C
ds
IS NEGLIGIBLE)
I
DSS
= 10
mA
25
mA
50mA 75mA 100mA 125mA
T
channel
= 25°C
I
D
= 1.0 mA
V
GS
= 0
10
I
DSS
, ZERO-GATE-VOLTAGE DRAIN CURRENT (mA)
Figure 10. Effect of I
DSS
On Drain–Source
Resistance and Gate–Source Voltage
20 30 40 50 60
70
80
90
100
110 120 130 140 150
10
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
100
90
80
70
60
50
40
30
20
10
0
V
GS
, GATE-SOURCE VOLTAGE (VOLTS)
T
channel
= 25°C
r
DS(on)
@ V
GS
= 0
V
GS(off)
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