DPAD SERIES
Linear Integrated Systems
FEATURES
MONOLITHIC DUAL
PICO AMPERE DIODES
Direct Replacement For SILICONIX DPAD SERIES
HIGH ON ISOLATION
20fA
EXCELLENT CAPACITANCE MATCHING
ABSOLUTE MAXIMUM RATINGS
1
@ 25 °C (unless otherwise stated)
Maximum Temperatures
Storage Temperature
Operating Junction Temperature
Maximum Power Dissipation
Continuous Power Dissipation (DPAD)
Maximum Currents
Forward Current (DPAD)
50mA
500mW
-65 to +150 °C
-55 to +135 °C
K1
DPAD
TO-72
BOTTOM VIEW
A1
3
5
DPAD1
TO-78
BOTTOM VIEW
C
A1
4
3
5
∆C
R
≤
0.2pF
A2
K2
1
7
K2
K1
1
7
A2
SSTDPAD
SOIC
K1
K1
A1
NC
1
2
3
4
8
7
6
5
K2
K2
A2
NC
COMMON ELECTRICAL CHARACTERISTICS @ 25 °C (unless otherwise stated)
SYMBOL
BV
R
V
F
|C
R1
-C
R2
|
CHARACTERISTIC
Reverse Breakdown
Voltage
Forward Voltage
Differential Capacitance
(∆C
R
)
Total Reverse Capacitance
DPAD1
ALL OTHERS
DPAD1
C
rss
DPAD2,5,10,20,50,100
SSTDPAD5,50,100
SPECIFIC ELECTRICAL CHARACTERISTICS @ 25 °C (unless otherwise stated)
SYMBOL
CHARACTERISTIC
(SST)DPAD1
(SST)DPAD2
(SST)DPAD5
I
R
Maximum Reverse
2
Leakage Current
(SST)DPAD10
(SST)DPAD20
(SST)DPAD50
(SST)DPAD100
DPAD
2
-1
-2
-5
-10
-20
-50
-100
-50
-100
-5
pA
V
R
= -20V
SSTDPAD
2
UNITS
CONDITIONS
DPAD1
DPAD2,5,10,20,50,100
SSTDPAD5,50,100
MIN
-45
-45
-30
0.8
1.5
0.2
0.5
0.8
2.0
4.0
pF
V
R
= -5V,
f
= 1MHz
V
I
R
= -1µA
I
F
= 1mA
V
R1
= V
R2
= -5V,
f
= 1MHz
TYP
MAX UNITS
CONDITIONS
Linear Integrated Systems
• 4042 Clipper Court • Fremont, CA 94538 • Tel: 510 490-9160 • Fax: 510 353-0261
Figure 1. Operational Amplifier Protection
Input Differential Voltage limited to 0.8V (typ) by DPADs D
1
and D
2
. Common
Mode Input voltage limited by DPADs D
3
and D
4
to ±15V.
Figure 2. Sample and Hold Circuit
Typical Sample and Hold circuit with clipping. DPAD diodes reduce offset
voltages fed capacitively from the JFET switch gate.
FIGURE 1
DPAD10
D1
D3
D2
D4
-
OP-27
+
FIGURE 2
+V
DPAD1
D1
-V
D2
2N4117A
2N4393
C
R
V
OUT
+V
e
in
+15V -15V
CONTROL
SIGNAL
TO-72
Four Lead
0.195 DIA.
0.175
0.030
MAX.
0.230
DIA.
0.209
0.150
0.115
TO-78
0.305
0.335
0.335
0.370
MAX.
0.040 0.165
0.185
MIN. 0.500
SEATING
PLANE
0.200
0.100
3 4
5
7
SOIC
0.014
0.018
1
2
0.021
3
4
0.150
0.157
8
7
6
5
0.050
0.189
0.196
0.016
0.019
DIM. A
0.016
0.021
DIM. B
0.029
0.045
1
4 LEADS
0.019 DIA.
0.016
0.100
0.500 MIN.
0.0040
0.0098
0.2284
0.2440
DIMENSIONS IN
INCHES
0.050
2
1
3
4
0.0075
0.0098
45°
0.046
0.036
45°
0.100
0.048
0.028
0.028
0.034
1.
2.
Absolute maximum ratings are limiting values above which serviceability may be impaired.
The DPAD type number denotes its maximum reverse current value in pico amperes. Devices with I
R
values intermediate to those
shown are available upon request.
Information furnished by Linear Integrated Systems is believed to be accurate and reliable. However, no responsibility is assumed for its
use; nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Linear Integrated Systems.
Linear Integrated Systems
• 4042 Clipper Court • Fremont, CA 94538 • Tel: 510 490-9160 • Fax: 510 353-0261
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Linear Integrated Systems Lead-Free / RoHS Fact
Sheet
The following is provided to address some of the more
commonly asked questions regarding how LIS is meeting
customer demand to supply product which is compliant to
the RoHS and WEEE Directives. If you have any
questions or need further information, please contact the
LIS factory for assistance.
Linear Integrated Systems can supply parts that do not
contain the following Banned Substances:
» Click Here «
for Lead-Free / RoHS
Part List
Asbestos
Azo Compounds
Cadmium
Cadmium Compounds
Chlorinated Paraffins
Hexavalent Chromium Compounds
Formaldehyde
Lead (Pb)
Mirex (Perchlordecone)
Mercury and Mercury Compounds
Organic Tin Compounds (Tributyl Tin & Triphenyl Tin)
Ozone Depletion Substances
PBB(Polybromobiphenyl)
PBDE (Polybromobiphenyl Biphenyls Ethers Category)
PCB (Polychlorinated Biphenyls)
Polychlorinated Naphthalene
Package Types:
The following packages do not and has never contained any of the above
mentioned substances:
Bare Die, (Metal Can) TO-18, TO-5, TO-52, TO-71, TO-72, TO-78, TO-99:
The following packages are available in Lead-Free / RoHS versions:
MSOP, QSOP, SOIC, SOT, TO-92.
Metal Can Facts:
Headers-Nickel with Gold Plating, Cans-100% Nickel
Plastic Package Facts:
Plating Material: Plastic Packages- Matte 100% Tin
Material of Lead Frame: Copper 194, or Alloy 42
Lead Content of the Plating Material: Lead Free (Less than 0.1%, 1000ppm
by weight)
Soldering: Maximum Temperature=260 Degree C, Maximum Time=20-40
seconds
Reflow Profile: Peak Temperature=260 Degree C, Peak Time=20-40
seconds
Acceptable number of Reflows: 3 times
Backward Compatibility: Lead Free packages can be soldered using
existing Sn-Pb solder and temperature profiles
Forward Compatibility: Lead Free Packages can be soldered using lead free
solders and the appropriate higher temperature profiles
Storage Conditions: Jedec Std. 20, Level 1
Questions:
Q1:
When does LIS plan to offer Lead Free packaging to its customers?
A1:
LIS has begun offering customers Lead Free packaging for plastic packages
as of 1/1/04, per customer request.
Q2:
When does LIS plan to offer RoHS compliant packaging to its customers?
A2:
LIS has begun offering customers RoHS compliant packaging for it plastic
packages as of 1/1/05, per customer request.
Q3:
Will LIS continue to offer Non-Lead Free (contains lead) packaging to its
customers?
A3:
Yes, LIS will continue to offer Non-Lead Free packaging, per customer
request.
Q4:
How do I order Lead Free parts versus Non-Lead Free Parts?
A4:
When ordering, specify "Lead-Free" in your part description on Purchase
Orders and Quotations.
Q5:
How do I order RoHS Compliant Parts versus Non-RoHS Compliant Parts?
A5:
When ordering, specify "RoHS Compliant" in your part description on
Purchase Orders and Quotations.
Q6:
How will I be able to identify a Lead-Free / RoHS Compliant Part versus a
Non-Lead Free Part / Non RoHS Compliant Part?
A6:
The Lead-Free RoHS Compliant Part will be marked with the letter "F".
Q7:
Are there any additional costs for ordering Lead-Free or RoHS Compliant
Parts?
A7:
Determined on a case by case basis.
Q8:
What is the LIS policy on Lead-Free implementation?
A8:
LIS will continue to supply requirements for both Lead-Free Parts and Non-
Lead Free parts per customer request.
Q9:
What is the LIS policy on RoHS Compliant Part implementation?
A9:
LIS has begun converting to ROHS Compliant mold compound on all plastic
Packages effective 1/1/05. All parts with date codes prior 1/1/05 are not made of
RoHS compliant mold compound.
Ordering Information:
1. RoHS Compliant (Lead-Free and PBDE-Free) Parts:
The part description must include the term "RoHS Compliant". Do not
include the letter "F", it must state RoHS Compliant. Purchase Orders that
do not specificately state RoHS Compliant will be shipped either "Leaded-
Parts"or "RoHS Compliant parts" depending on our inventory.
2. Leaded (Devices that contain lead) Parts:
The part description must include the term "Leaded Part". Purchase Orders
that do not specifically state "Leaded Part" will be shipped either "Leaded-
Parts" or "RoHS Compliant parts" depending on our inventory.
3. Disclaimer:
LIS will not be responsible for accepting the return of any parts that were not
ordered correctly by the customer.
Linear Integrated Systems · 4042 Clipper Court · Fremont · California · USA · 94538 - 6540
Web Site: http://www.linearsystems.com
Phone: 510-490-9160 Fax: 510-353-0261
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