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H

AC/DC to Logic Interface

Optocouplers

Technical Data

HCPL-3700

HCPL-3760

Description

The HCPL-3700 and HCPL-3760

are voltage/current threshold

detection optocouplers. The

HCPL-3760 is a low-current

version of the HCPL-3700. To

obtain lower current operation,

the HCPL-3760 uses a high-

efficiency AlGaAs LED which

provides higher light output at

lower drive currents. Both

devices utilize threshold sensing

input buffer ICs which permit

control of threshold levels over a

wide range of input voltages with

a single external resistor.

Features

• Standard (HCPL-3700) and

Low Input Current

(HCPL-3760) Versions

• AC or DC Input

• Programmable Sense Voltage

• Hysteresis

• Logic Compatible Output

• Thresholds Guaranteed over

Temperature

• Thresholds Independent of

LED Optical Parameters

• Recognized under UL 1577

and CSA Approved for

Dielectric Withstand Proof

Test Voltage of 2500 Vac, 1

Minute

Applications

• Limit Switch Sensing

• Low Voltage Detector

• 5 V-240 V AC/DC Voltage

Sensing

• Relay Contact Monitor

• Relay Coil Voltage Monitor

• Current Sensing

• Microprocessor Interfacing

CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to

prevent damage and/or degradation which may be induced by ESD.

The input buffer incorporates

several features: hysteresis for

extra noise immunity and

switching immunity, a diode

bridge for easy use with ac input

signals, and internal clamping

Functional Diagram

1

2

3

4

8

7

6

5

AC

DC+

DC-

AC

VCC

VO

GND

TRUTH TABLE

(POSITIVE LOGIC)

INPUT

H

L

OUTPUT

L

H

NC

5965-3582E