Littelfuse SP720 User Manual
TVS Diode Arrays (SPA
V+
RoHS
GREEN
IN
IN
IN
IN
IN
IN
V-
IN
V+
®
Diodes)
General Purpose ESD Protection - SP720 Series
SP720 Series 3pF 4kV Diode Array
Pinout
3 - 7
9 - 15
16
IN
15
14
IN
13
IN
IN
12
IN
11
IN
10
IN
9
SP720 (PDIP, SOIC)
TOP VIEW
Functional Block Diagram
16
IN
1
IN
2
1
2
3
4
5
6
7
8
IN
Pb
Description
The SP720 is an array of SCR/Diode bipolar structures for
ESD and over-voltage protection to sensitive input circuits.
The SP720 has 2 protection SCR/Diode device structures
per input. A total of 14 available inputs can be used to
protect up to 14 external signal or bus lines. Over-voltage
protection is from the IN (pins 1-7 and 9-15) 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 8). 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:
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 Risetime
• Low Input Leakages ................................. 1nA at 25º (Typ)
• Low Input Capacitance ....................................... 3pF (Typ)
• An Array of 14 SCR/Diode Pairs
• Operating Temperature Range....................-40ºC to 105ºC
diode threshold above V+ (Pin 16) or
BE
V-
8
Additional Information
Datasheet
Life Support Note:
Not Intended for Use in Life Support or Life Saving Applications
The products shown herein are not designed for use in life sustaining or life saving
applications unless otherwise expressly indicated.
© 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 - SP720 Series
Absolute Maximum Ratings
Parameter Rating Units
Continuous Supply Voltage, (V+) - (V-) +35 V
Forward Peak Current, I
(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 - See Figure 1, Table 1
Load Dump and Reverse Battery (Note 2)
Electrical Characteristics T
to VCC, IIN to GND
IN
= -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 90
SOIC Package 130
Maximum Storage Temperature Range -65 to 150oC
Maximum Junction Temperature (Plastic
Package)
Maximum Lead Temperature
(Soldering 20-40s) (SOIC Lead Tips Only)
1. θJA is measured with the component mounted on an evaluation PC board in free air.
150
260
o
JA
o
o
C/W
C/W
C/W
o
C
o
C
Parameter Symbol Test Conditions Min Typ Max Units
Operating Voltage Range,
= [(V+) - (V-)]
V
SUPPLY
V
SUPPLY
- 2 to 30 - V
Forward Voltage Drop: IIN = 1A (Peak Pulse)
IN to V- V
IN to V+ V
Input Leakage Current I
Quiescent Supply Current I
QUIESCENT
FWDL
FWDH
IN
- 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 everse battery V+ and V- pins are connected to the same supply
voltage source as the device or control line under protection, a current limiting resistor should be connected in series between the external supply and the SP720 supply pins to limit
reverse battery current to within the rated maximum limits. Bypass capacitors of typically 0.01µF or larger from 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 SP720
(Application as an Input Clamp for Over-voltage, greater than 1VBE
Above V+ or less than -1VBE below V-)
+V
INPUT
DRIVERS
OR
SIGNAL
SOURCES
SP720 INPUT
PROTECTION CIRCUIT
(1 OF 14 ON CHIP)
CC
SP720
IN 9-15IN 1-7
LINEAR OR
DIGITAL IC
INTERFACE
TO +V
V+
V-
+V
CC
CC
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Revised: 04/24/13
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