(Typ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35鈩?/div>
鈥?I
D(OFF)
(Typ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10pA
鈥?Switching Times (R
L
= 1k鈩?
- t
ON
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25ns
- t
OFF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75ns
鈥?Built-In Overvoltage Protection . . . . . . . . . . . . . .
鹵25V
鈥?Charge Injection Error (Typ) into 0.01碌F Capacitor . . 3mV
鈥?C
ISS
(Typ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1pF
鈥?Can Be Used for Hybrid Construction
Description
The IH401A is made up of 4 monolithically constructed
combinations of varacitor type diode and a N-Channel JFET.
The JFET itself is very similar to the popular 2N4391, and
the driver diode is specially designed, such that its
capacitance is a strong function of the voltage across it. The
driver diode is electrically in series with the gate of the
N-Channel FET and simulates a back-to-back diode
structure. This structure is needed to prevent forward biasing
the source-to-gate or drain-to-gate junctions of the JFET
when used in switching applications.
Previous applications of JFETs required the addition of
diodes, in series with the gate, and then perhaps a gate-to-
source referral resistor or a capacitor in parallel with the
diode; therefore, at least 3 components were required to
perform the switch function. The IH401A does this same job
in one component (with a great deal better performance
characteristics).
Like a standard JFET, the practically perform a solid state
switch function translator should be added to drive the diode.
This translator takes the TTL levels and converts them to
voltages required to drive the diode/FET system (typically a
0V to -15V translation and a 3V to +15V shift). With
鹵15V
power supplies, the IH401A will typically switch 22V
P-P
at
any frequency from DC to 20MHz, with less than 50鈩?/div>
r
DS(ON)
.
IH401A
(CERDIP)
TOP VIEW
S
1
1
D
1
2
DR
1
3
4
DR
2
5
S
2
6
D
2
7
8
16 D
4
15 S
4
14 DR
4
13
12 DR
3
11 S
3
10 D
3
9
Part Number Information
PART
NUMBER
IH401A
TEMP. RANGE
(
o
C)
-55 to 125
PACKAGE
16 Ld CERDIP
Pinout
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
漏
Harris Corporation 1999
File Number
3128.2
14-1
1
2
3
4
5
