© 2013 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 04/24/13

General Purpose ESD Protection - SP721 Series

Description

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

Applications

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. Over-

voltage 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

a clamp to V+ is activated if a transient pulse causes the

input to be increased to a voltage level greater than one

V

pulse, one V

Standard ESD Human Body Model (HBM) Capability is:

• Microprocessor/Logic

Input Protection

• Data Bus Protection

• Analog Device Input

Protection

• Voltage Clamp

Pinout

Functional Block Diagram

4

V+

V-

IN

3, 5-7

IN

IN

1

8

2

SP721 (PDIP, SOIC)

TOP VIEW

IN

IN

IN

V-

1

2

3

4

8

7

6

5

V+

IN

IN

IN

SP721 Series 3pF 4kV Diode Array

Additional Information

Datasheet

Resources

Samples