Description

The HCPL-0370/3700 and HCPL-3760 are voltage/cur-

rent threshold detectionoptocouplers. The HCPL-3760 is

a low-current version of the HCPL-0370/3700. To obtain

lower current operation, the HCPL-3760 uses a high-effi-

ciency AlGaAs LED which provides higher light output at

lower drive currents. The devices utilize threshold sens-

ing input buffer ICs which permit control of threshold

levels over a wide range of input voltages with a single

external resistor.

The input buffer incorporates several features: hysteresis

for extra noise immunity and switching immunity, a di-

ode bridge for easy use with ac input signals, and inter-

nal clamping diodes to protect the buffer and LED from

a wide range of over-voltage and over-current transients.

Because threshold sensing is done prior to driving the

LED, variations in optical coupling from the LED to the

detector will have no effect on the threshold levels.

Functional Diagram

HCPL-0370, HCPL-3700, HCPL-3760

Isolated Voltage/Current Detectors

Data Sheet

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

• AC mains and DC link voltage detection

• Relay contact monitor

• Relay coil voltage monitor

• Current sensing

• Microprocessor interfacing

Lead (Pb) Free

RoHS 6 fully

compliant

RoHS 6 fully compliant options available;

-xxxE denotes a lead-free product

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.

1

2

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8

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HCPL-3700 Functional Diagram

AC

DC+

DC-

AC

VCC

VO

GND

TRUTH TABLE

(POSITIVE LOGIC)

INPUT

H

L

OUTPUT

L

H

NC