Low Input Current, High Gain Optocouplers

Currently Viewing:

This high gain optocoupler series uses a Light Emitting Diode and an integrated high gain photodetector to provide extremely high current transfer ratio between input and output. Separate pins for the photodiode and output stage result in TTL compatible saturation voltages and high speed operation. Where desired VCC and VO terminals may be tied together to achieve convention photodarlington operation.A base access terminal allows a gain bandwidth adjustment to be made.

The HCNW138 is designed for use mainly in TTL applications. Current transfer ratio (CTR) is 300% minimum over 0 to 70 degrees C for an LED current of 1.6 mA (1 TTL Unit load). A 300% minimum CTR enables operation with 1 TTL Load using a 2.2 k ohm pull-up resistor.

Selection for lower input current down to 250 mA is available upon request.

The HCNW138 is packaged in a widebody encapsulation that provides creepage and clearance dimensions suitable for safety approval by regulatory agencies worldwide.



  • High Current Transfer Ratio - 4500% Typical
  • Low Input Current Requirements - 0.5 mA
  • TTL Compatible Output - 0.1V VOL Typical
  • Performance Guaranteed over Temperature 0 degrees C to 70 degrees C
  • Base Access Allows Gain Bandwidth Adjustment
  • High Output Current - 60 mA
  • Safety Approval:
UL Recognized - 2500 V rms for 1 minute and 5000 V rms for 1 minute per UL 1577
CSA Approved
IEC/EN/DIN EN 60747-5-2 Approved with VIORM = 1414 V peak
  • Available in 8-Pin DIP or SOIC-8 Footprint or Widebody Package
  • Options available are:
300 = Gull Wing Surface Mount Option
500 = Tape and Reel Packaging Option
XXXE = Lead Free Option


  • Ground Isolate Most Logic Families - TTL/TTL, COMS/TTL, CMOS/CMOS, LSTTL/TTL, CMOS/LSTTL
  • Low Input Current Line Receiver
  • High Voltage Insulation
  • EIA RS-232C Line Receiver
  • Telephone Ring Detector
  • 117 V ac Line Voltage Status Indicator - Low Input Power Dissipation
  • Low Power Systems - Ground Isolation

Lifecycle Status



  • RoHS
    Pb & Pb-free options available

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
Distrib. Inventory Yes
Samples Available Yes
RoHS6 Compliant Pb & Pb-free options available
Max Qty of Samples 20
Product Type 100 KBd Darlington Transistor Output
Package 400mil DIP
VDD (V) 5
IF Min. (mA) 0.5
CTR Min. (%) 300.0
CTR Max. (%) N.A.
Prop Delay (tPLH) Max. (µs) 70.0
Prop Delay (tPHL) Max. (µs) 11.0
CMR (min.) (V/µs) 1000.0
Vcm (V) 10.0
UL Insulation Rating Viso (VRMS) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 1414


Application Brief (1) i
Application Note (5) i
Brochures (2) i
Data Sheet (1) i
FAQs (1) i
Obsolescence Notice (1) i
Options Data Sheet (5) i
Product Change Notice (PCN) (13) i
Regulatory Certificate (2) i
Selection Guide (2) i
White Papers (3) i