© 2013 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 04/24/13

General Purpose ESD Protection - SP721 Series

Absolute Maximum Ratings

Parameter

Rating

Units

Continuous Supply Voltage, (V+) - (V-)

+35

V

Forward Peak Current, I

(Refer to Figure 5)

±2, 100µs

A

Thermal Information

Parameter

Rating

Units

Thermal Resistance (Typical, Note 1)

θ

JA

o

C/W

PDIP Package

160

o

C/W

SOIC Package

170

o

C/W

Maximum Storage Temperature Range

-65 to 150

o

C

Maximum Junction Temperature (Plastic

Package)

150

o

C

Maximum Lead Temperature

(Soldering 20-40s)(SOIC Lead Tips Only)

260

o

C

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.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operating Voltage Range,

V

SUPPLY

-

2 to 30

-

V

V

Forward Voltage Drop

IN to V-

V

FWDL

I

-

2

-

V

IN to V+

V

FWDH

-

2

-

V

Input Leakage Current

I

IN

-20

5

+20

nA

Quiescent Supply Current

I

QUIESCENT

-

50

200

nA

Equivalent SCR ON Threshold

Note 3

-

1.1

-

V

Equivalent SCR ON Resistance

V

-

1

-

Ω

Input Capacitance

C

IN

-

3

-

pF

Input Switching Speed

t

ON

-

2

-

ns

Note:

ESD Ratings and Capability (Figure 1, Table 1)

Load Dump and Reverse Battery (Note 2)

1. θ

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.

INPUT

DRIVERS

SP721 INPUT PROTECTION CIRCUIT (1 OF 6 SHO WN)

OR

SIGNAL

SOURCES

IN 5 - 7

IN 1 - 3

SP721

V-

LINEAR OR

DIGITAL IC

INTERFACE

V+

(Application as an Input Clamp for Over-voltage, Greater

than 1V

Typical Application of the SP721