High CMR, High Speed TTL Compatible Optocouplers

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The HCPL-4661 optocoupler is an optically coupled logic gate that combines a GaAsP light emitting diode and an integrated high gain photo detector. An enable input allows the detector to be strobed. The output of the detector IC is an open collector Schottky-clamped transistor. The internal shield provides a guaranteed common mode transient immunity specification of 10,000 V/ms.

This unique design provides maximum ac and dc circuit isolation while achieving TTL compatibility. The optocoupler ac and dc operational parameters are guaranteed from -40 degrees C to 85 degrees C allowing troublefree system performance.

HCPL-4661 is suitable for high speed logic interfacing, input/output buffering, as line receivers in environments that conventional line receivers cannot tolerate and is recommended for use in extremely high ground or induced noise environments.



  • 10 kV/ms Minimum Common Mode Rejection (CMR) at VCM = 1000 V
  • High Speed: 10 MBd Typical
  • LSTTL/TTL Compatible
  • Low Input Current Capability: 5mA
  • Guaranteed ac and dc Performance over Temperature: -40 degrees C to 85 degrees C
  • Available in 8-Pin DIP, SOIC-8, Widebody Packages
  • Strobable Output (Single Channel Products only)
  • Safety Approval:
UL Recognized - 3750 V rms for 1 minute and 5000 V rms for 1 Minute (Option 020 only) per UL1577
CSA Approved
  • Options available are:
020 = 5000 V rms/1 minute UL Rating Option
300 = Gull Wing Surface Mount Option
500 = Tape and Reel Packaging Option
XXXE = Lead Free Option


  • Isolated Line Receiver
  • Computer-Peripheral Interfaces
  • Microprocessor System Interfaces
  • Digital Isolation for A/D, D/A Conversion
  • Switching Power Supply
  • Instrument Input/Output Isolation
  • Ground Loop Elimination
  • Pulse Transformer Replacement

Lifecycle Status


Replacement Part


  • RoHS
    Pb & Pb-free options available

Lifecycle Status


Upgrade Part

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 10 MBd Logic Gate
Package 300mil DIP-8
VDD (V) 5
IF Min. (mA) 5.0
Prop Delay (tPLH) Max. (µs) 100.0
Prop Delay (tPHL) Max. (µs) 100.0
CMR (min.) (V/µs) 10000.0
Vcm (V) 1000.0
UL Insulation Rating Viso (VRMS) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 630


Application Brief (1) i
Application Note (6) i
Brochures (2) i
Data Sheet (1) i
Design Guide (1) i
FAQs (1) i
Obsolescence Notice (1) i
Options Data Sheet (5) i
Product Change Notice (PCN) (19) i
Promotional Material (1) i
Regulatory Certificate (1) i
Selection Guide (2) i
White Papers (4) i