VCR2N / 3P / 4N / 5P / 7N
CORPORATION
ELECTRICAL CHARACTERISTICS (TA = 25oC unless otherwise specified)
N CHANNEL VCR FETs
VCR2N
VCR4N
VCR7N
SYMBOL
PARAMETER
UNITS
TEST CONDITIONS
MIN MAX MIN MAX MIN
MAX
STATIC
V
V
GS = -15V,
DS = 0
IGSS
Gate Reverse Current
-5
-0.2
-7
-0.1
nA
IG = -1µA,
DS = 0
BVGSS
Gate-Source Breakdown Voltage
-15
-15
-15
V
V
-7.0
60
VGS(off)
rds(on)
Gate-Source Cutoff Voltage
Drain Source ON Resistance
-3.5
20
-3.5
200
-2.5
-5
ID = 1µA. VDS = 10V
VGS = 0, ID = 0
f = 1kHz
f = 1MHz
600 4,000 8,000
Ω
DYNAMIC (Note 1)
Cdgo
Csgo
Drain-Gate Capacitance
Source-Gate Capacitance
7.5
7.5
3
3
1.5
1.5
VGD = -10V, IS = 0
VGS = -10V, ID = 0
pF
NOTE 1: For design reference only, not 100% tested.
P CHANNEL VCR FETs
VCR3P
VCR5P
SYMBOL
PARAMETER
UNITS
TEST CONDITIONS
MIN MAX MIN MAX
STATIC
IGSS
Gate Reverse Current
VGS = 15V, VDS = 0
IG = 1µA, VDS = 0
ID = -1µA, VDS = -10V
VGS = 0, ID = 0
20
10
nA
V
BVGSS
VGS(off)
rds(on)
Gate-Source Breakdown Voltage
Gate-Source Cutoff Voltage
Drain-Source ON Resistance
15
1.0
70
15
3.5
300
5
7
f = 1kHz
200
900
Ω
DYNAMIC (Note 1)
Cdgo
Csgo
Drain-Gate Capacitance
Source-Gate Capacitance
VGD = 10V, IS = 0
VGS = 10V, ID = 0
6
6
3
3
f = 1MHz (Note 1)
pF
NOTE 1: For design reference only, not 100% tested.
JFETS AS VOLTAGE REGULATORS
The voltage controlled resistor is a junction field effect
transistor whose drain to source ON resistance is controlled
by gate to source voltage.
current is applied to the drain and the input signal level is kept
low.
Figure 1 also shows that certain combinations of gate control
voltage and signal levels will cause resistance modulation.
This distortion may be improved by introducing local feedback
as shown in figure 2 for best frequency response and
impedance levels; eliminating the feedback capacitor will
require the gate control voltage to be double for the same ON
resistance. The resistor values should be equal, and about
100Ω.
The gate control terminal is high impedance thereby allowing
negligible control current. The gate voltage is zero for
minimum resistance, and increases as the gate voltage
approaches the pinch-off voltage.
This VCR is intended for use on applications using low level
AC signals. Figure 1 shows the output characteristics, with an
enlarged graph of VDS=0 for AC signals with no DC
component. Operation is in the first and third quadrants; the
device will operate in the first quadrant only if a constant
Best gate control voltage for best linearity is up to about
0.8VPK; ON resistance increases rapidly beyond this point.
