Dual Pico Amp Diodes
DPAD1 / DPAD2 / DPAD5 / DPAD10 / DPAD20 / DPAD50 / DPAD100
SSTDPAD5 / SSTDPAD10 / SSTDPAD20 / SSTDPAD50 / SSTDPAD100
FEATURES
High OFF Isolation. . . . . . . . . . . . . . . . . 1 pA max DPAD1
Excellent Isolation between diodes. . . . . . Typical 20
f
A
Matched Capacitance
APPLICATIONS
Op Amp Protection Devices
Diode Switching
High Impedance Protection
DESCRIPTION
Calogic's ultra low leakage dual pico amp diodes out perform
conventional diodes for applications where reverse current
(leakage) is critical and must be kept at a minimum. The
devices have very low capacitance and are also fast
switching. Housed in a compact dual hermetic package and a
plastic surface mount SO-8 this product is also available in
chip form for hybrid uses.
ORDERING INFORMATION
Part
Package
Temperature Range
DPAD1
Hermetic TO-78
-55 to +150
o
C
DPAD2/50
Hermetic TO-71
-55 to +150
o
C
SSTDPAD5/100 Plastic SO-8
-55 to +150
o
C
XDPAD5/100
Sorted Chips in Carriers -55 to +150
o
C
CORPORATION
SCHEMATIC DIAGRAM
TO-71
(MODIFIED)
(PINS 2 AND
6 REMOVED)
A
1
A
2
C
2
C
1
C
C
1
C
2
A
1
A
2
TO-78
(MODIFIED)
(DPAD1 ONLY)
A
C
A
C
BOTTOM VIEW
(ALTERNATE)
1
A
1
C
1
A
2
C
2
2
3
4
1
A
1
C
1
A
2
C
2
C
BOTTOM VIEW
CASE
2
5
4
3
PIN CONFIGURATION
SO-8
C1
A1
N/C
C2
A2
C1
N/C
C2
CJ1, CJ2, CJ4
DPAD1 / DPAD2 / DPAD5 / DPAD10 / DPAD20 / DPAD50 / DPAD100
SSTDPAD5 / SSTDPAD10 / SSTDPAD20 / SSTDPAD50 / SSTDPAD100
CORPORATION
ABSOLUTE MAXIMUM RATINGS (25
o
C)
Forward Gate Current, Each Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Total Device Dissipation @ T
A
= 25
o
C
Derate
4.0
mW/
o
C to 125
o
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125
o
C
Lead Temperature (1/16" from case for 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
o
C
ELECTRICAL CHARACTERISTICS (25
o
C unless otherwise noted)
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNIT
TEST CONDITIONS
STATIC
I
R
Reverse Current
-1
pA
VR = -20 V
DPAD1
-2
DPAD2
-5
DPAD5
-10
DPAD10
-20
DPAD20
-50
DPAD50
-100
DPAD100
BV
R
Breakdown Voltage (Reverse)
-45
-120
V
I
R
= -1
A
DPAD1, 2, 5
-35
DPAD10, 20, 50, 100
V
F
Forward Voltage Drop
0.8
1.5
I
F
= 5 mA
DPAD1, 2, 5, 10, 20, 50, 100
DYNAMIC
C
R
Capacitance
0.8
pF
V
R
= -5 V, f = 1 MHz
DPAD1, 2, 5
2.0
DPAD10, 20, 50, 100
| CR1 - CR2 |
Differential Capacitance
0.1
0.2
pF
V
R1
= V
R2
= -5 V, f = 1 MHz
DPAD1, 2, 5, 10, 20, 50, 100
APPLICATION
Operational Amplifier Protection. Input Differential Voltage
limited to 0.8 V (typ) by DPADS D
1
and D
2
Common mode
input voltage limited by DPADS D
3
and D
4
to
15V.
Typical sample and hold circuit with clipping, DPAD diodes
reduce offset voltages fed capacitively from the FET switch
gate.
DPAD10
D
1
D
4
+
1
-15V
+15V
_
D
2
D
3
I < 1 pA
R
+V
-V
DPAD1
V
OUT
C
CONTROL SIGNAL
e
in
+
DPAD1
J110
J210
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