AC/DC to Logic Interface
Optocouplers
Technical Data
HCPL-0370
HCPL-3700
HCPL-3760
Features
鈥?Standard (HCPL-0370/3700)
and Low Input Current
(HCPL-3760) Versions
鈥?AC or DC Input
鈥?Programmable Sense Voltage
鈥?Hysteresis
鈥?Logic Compatible Output
鈥?Thresholds Guaranteed over
Temperature
鈥?Thresholds Independent of
LED Optical Parameters
鈥?Recognized under UL 1577
and CSA Approved for
Dielectric Withstand Proof
Test Voltage of 3750 Vac, 1
Minute
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.
HCPL-0370/3700/3760
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
Applications
鈥?Limit Switch Sensing
鈥?Low Voltage Detector
鈥?5 V-240 V AC/DC Voltage
Sensing
鈥?Relay Contact Monitor
鈥?Relay Coil Voltage Monitor
鈥?Current Sensing
鈥?Microprocessor Interfacing
AC 1
8
V
CC
DC+ 2
7
NC
DC- 3
6
V
O
AC 4
5
GND
TRUTH TABLE
(POSITIVE LOGIC)
INPUT OUTPUT
L
H
H
L
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.