H
AC/DC to Logic Interface
Optocouplers
Technical Data
HCPL-3700
HCPL-3760
Features
鈥?Standard (HCPL-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 2500 Vac, 1
Minute
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.
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
AC 1
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
8
V
CC
DC+ 2
7
NC
DC- 3
6
V
O
AC 4
5
GND
TRUTH TABLE
(POSITIVE LOGIC)
INPUT OUTPUT
H
L
L
H
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.
1-348
5965-3582E