Littelfuse SP721 User Manual
TVS Diode Arrays (SPA
V+
IN
IN
IN
IN
V+
RoHS
GREEN
®
Diodes)
General Purpose ESD Protection - SP721 Series
SP721 Series 3pF 4kV Diode Array
Pinout
SP721 (PDIP, SOIC)
TOP VIEW
Functional Block Diagram
8
1
4
V-
2
IN
1
2
3
V-
4
3, 5-7
IN
8
7
6
5
Pb
Description
The SP721 is an array of SCR/Diode bipolar structures for
ESD and over-voltage protection to sensitive input circuits.
The SP721 has 2 protection SCR/Diode device structures
per input. There are a total of 6 available inputs that can be
used to protect up to 6 external signal or bus lines. Overvoltage protection is from the IN (Pins 1 - 3 and Pins 5 - 7)
to V+ or V-.
The SCR structures are designed for fast triggering at a
threshold of one +V
a -V
diode threshold below V- (Pin 4). From an IN input,
BE
a clamp to V+ is activated if a transient pulse causes the
input to be increased to a voltage level greater than one
V
above V+. A similar clamp to V- is activated if a negative
BE
pulse, one V
less than V-, is applied to an IN input.
BE
Standard ESD Human Body Model (HBM) Capability is:
IN
IN
IN
Features
• ESD Interface Capability for HBM Standards
- MIL STD 3015.7 ................................................. 15kV
- IEC 61000-4-2, Direct Discharge,
- Single Input .......................................... 4kV (Level 2)
- Two Inputs in Parallel ............................ 8kV (Level 4)
- IEC 61000-4-2, Air Discharge ...............15kV (Level 4)
• High Peak Current Capability
- IEC 61000-4-5 (8/20µs) ....................................... ±3A
- Single Pulse, 100µs Pulse Width ........................ ±2A
- Single Pulse, 4µs Pulse Width ............................ ±5A
• Designed to Provide Over-Voltage Protection
- Single-Ended Voltage Range to ........................ +30V
- Differential Voltage Range to ............................ ±15V
• Fast Switching .............................................2ns Rise Time
• Low Input Leakages ............................1nA at 25ºC Typical
• Low Input Capacitance .....................................3pF Typical
• An Array of 6 SCR/Diode Pairs
• Operating Temperature Range....................-40ºC to 105ºC
diode threshold above V+ (Pin 8) or
BE
Additional Information
Datasheet
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 04/24/13
Resources
Samples
Applications
• Microprocessor/Logic
Input Protection
• Data Bus Protection
• Analog Device Input
Protection
• Voltage Clamp
TVS Diode Arrays (SPA
®
Diodes)
General Purpose ESD Protection - SP721 Series
Absolute Maximum Ratings
Parameter Rating Units
Continuous Supply Voltage, (V+) - (V-) +35 V
Forward Peak Current, IIN to VCC, IIN to GND
(Refer to Figure 5)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress only rating and operation of the device
at these or any other conditions above those indicated in the operational sections of this
specification is not implied.
Note:
ESD Ratings and Capability (Figure 1, Table 1)
Load Dump and Reverse Batter y (Note 2)
Electrical Characteristics T
= -40oC to 105oC, V
A
±2, 100µs A
= 0.5VCC , Unless Otherwise Specified
IN
Thermal Information
Parameter Rating Units
Thermal Resistance (Typical, Note 1) θ
PDIP Package 160
SOIC Package 170
Maximum Storage Temperature Range -65 to 150oC
Maximum Junction Temperature (Plastic
Package)
Maximum Lead Temperature
(Soldering 20-40s)(SOIC Lead Tips Only)
is measured with the component mounted on an evaluation PC board in free air.
1. θ
JA
JA
150
260
o
C/W
o
C/W
o
C/W
o
C
o
C
Parameter Symbol Test Conditions Min Typ Max Units
Operating Voltage Range, V
= [(V+) - (V-)]
V
SUPPLY
SUPPLY
- 2 to 30 - V
Forward Voltage Drop
IN to V- V
IN to V+ V
Input Leakage Current I
Quiescent Supply Current I
QUIESCENT
FWDL
FWDH
IN
IIN = 1A (Peak Pulse) - 2 - V
- 2 - V
-20 5 +20 nA
- 50 200 nA
Equivalent SCR ON Threshold Note 3 - 1.1 - V
Equivalent SCR ON Resistance V
Input Capacitance C
Input Switching Speed t
Notes:
2. In automotive and battery operated systems, the power supply lines should be externally protected for load dump and reverse battery. When the V+ and V- Pins are connected to het same
supply voltage source as the device or control line under protection, a current limiti ng resistor should be connected in series between the external supply and the SP721 supply pins to
limit reverse battery current to within the rated maximum limits. Bypass capacitors of typically 0.01µF or larger romf the V+ and V- Pins to ground are recommended.
3. Refer to the Figure 3 graph for definitions of equivalent “SCR ON Threshold” and “SCR ON Resistance”. These characteristics are given here for thumb-rule nformation to determine peak
current and dissipation under EOS conditions.
IN
ON
; Note 3 - 1 - Ω
FWD/IFWD
- 3 - pF
- 2 - ns
Typical Application of the SP721
(Application as an Input Clamp for Over-voltage, Greater
than 1VBE Above V+ or less than -1VBE below V-)
LINEAR OR
DIGITAL IC
INTERFACE
TO +V
V+
V-
+V
CC
CC
+V
CC
INPUT
DRIVERS
OR
SIGNAL
SOURCES
SP721
SP721 INPUT PROTECTION CIRCUIT (1 OF 6 SHO WN)
IN 5 - 7IN 1 - 3
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Revised: 04/24/13
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