LM397

Single General Purpose Voltage Comparator

General Description

The LM397 is a single voltage comparator with an input

common mode that includes ground. The LM397 is designed

to operate from a single 5V to 30V power supply or a split

power supply. Its low supply current is virtually independent

of the magnitude of the supply voltage.

The LM397 features an open collector output stage. This

allows the connection of an external resistor at the output.

The output can directly interface with TTL, CMOS and other

logic levels, by tying the resistor to different voltage levels

(level translator).

The LM397 is available in space saving SOT23-5 package

and pin compatible to TI’s TL331, single differential com-

parator.

Features

(T

n

SOT23-5 package

n

Industrial operating range

−40˚C to +85˚C

n

Single or dual power supplies

n

Wide supply voltage range

5V to 30V

n

Low supply current

300µA

n

Low input bias current

7nA

n

Low input offset current

n

Low input offset voltage

n

Response time

440ns (50mV overdrive)

n

Input common mode voltage

0 to V

Applications

n

A/D converters

n

Pulse, square wave generators

n

Peak detector

n

Industrial applications

Connection Diagram

SOT23-5

20022108

Top View

Typical Circuit

Ordering Information

Package

Part Number

Package Marking

Transport Media

NSC Drawing

5-Pin SOT-23

LM397MF

C397

1k Units Tape and Reel

MF05A

LM397MFX

3k Units Tape and Reel

20022109

FIGURE 1. Inverting Comparator with Hysteresis

June 2001

© 2001 National Semiconductor Corporation

DS200221

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