AC/DC to Logic Interface

Optocouplers

Technical Data

HCPL-0370

HCPL-3700

HCPL-3760

Description

The HCPL-0370/3700 and

HCPL-3760 are voltage/current

threshold detection optocouplers.

The HCPL-3760 is a low-current

version of the HCPL-0370/3700.

To obtain lower current

operation, the HCPL-3760 uses a

high-efficiency AlGaAs LED

which provides higher light

output at lower drive currents.

The 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-0370/3700)

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 3750 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

HCPL-0370/3700/3760