Isolated Voltage/Current Detectors

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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.

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 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. 


  • 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.
  • Options available are:
    060 = IEC/EN/DIN EN 60747-5-2 Option
    300 = Gull Wing Surface Mount Option
    500 = Tape/Reel Package Option (1 K min.)
    XXXE = Lead Free Option


  • Limit Switch Sensing
  • Low Voltage Detector
  • AC mains and DC link voltage detection
  • Relay Contact Monitor
  • Relay Coil Voltage Monitor
  • Current Sensing
  • Microprocessor Interfacing

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
Distrib. Inventory Yes
CMR (min.) (V/µs) 600.0
Vcm (V) 140.0
Hysteresis (mA) 1.2
Hysteresis Uom mA
RoHS6 Compliant Pb & Pb-free options available
Package SO8
Product Type AC / DC to Logic Interface
Prop Delay (tPHL) Max. (µs) 15.0
Prop Delay tPHL Uom µs
Prop Delay (tPLH) Max. (µs) 14.0
Prop Delay tPLH Uom µs
VDD2 (V) 20.0
UL Insulation Rating Viso (VRMS) 3750.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 566.0
Hysteresis (mA) 1.2 mA
Prop Delay (tPHL) Max. (µs) 15 µs
Prop Delay (tPLH) Max. (µs) 14 µs
Application Brief1 i
Application Note3 i
Brochures2 i
Design Guide1 i
Options Data Sheet3 i
Product Change Notice (PCN)11 i
Regulatory Certificate1 i
Reliability Data Sheet2 i
Selection Guide2 i
White Papers3 i
FAQs1 i
Promotional Material1 i