Single Channel, High Speed Logic Interface Optocoupler

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The single channel HCPL-2503 optocoupler is specified for use in LSTTL-to-LSTTL and TTL-to-LSTTL logic interfaces.

A nominal 8 mA sink current through the input LED will provide enough output current for proper operation of 1 LSTTL gate under worst-case conditions when used in the recommended circuits. The CTR of the HCPL-2503 is 15% minimum at IF = 8 mA.

The HCPL-2503 contains a light emitting diode and an integrated photon detector with a 3000 Vdc withstand test between input and output. Separate connection for the photodiode bias and output transistor collector reduce the base-collector capacitance, giving improved speed compared with conventional phototransistor couplers.


  • Data rates to 250 kb/s NRZ
  • LSTTL compatible
  • High common mode transient immunity: > 1000 V/µs
  • 3750 Vdc withstand test voltage
  • Open collector output
  • Guaranteed performance from temperature: 0oC to 70oC
  • Safety Approval:
    - UL Recognized - 3750 V rms for 1 minute (5000 V rms for 1 minute Option 020 devices) per UL1577.
    - IEC/EN/DIN EN 60747-5-2 Approved:
          VIORM = 630 V peak for Option 060
  • Options available are:
    020 = UL 5000 V rms/1 Minute Option*
    060 = IEC/EN/DIN EN 60747-5-2 Viorm = 630 V peak Option**
    300 = Gull Wing Surface Mount Option
    500 = Tape and Reel Packaging Option
    XXXE = RoHS Compliant Option


  • High speed logic ground isolation - LSTTL-to-LSTTL and TTL-to-LSTTL
  • High voltage isolation
  • Analog signal ground isolation

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
RoHS6 Compliant Pb & Pb-free options available
Distrib. Inventory Yes
Product Type 1 MBd Transistor Optocoupler
Package 300mil DIP
VDD (V) 5
IF Min. (mA) 16.0
CTR Min. (%) 15.0
CTR Max. (%) 22
Prop Delay (tPLH) Max. (µs) 2.5
Prop Delay (tPHL) Max. (µs) 1.5
CMR (min.) (V/µs) 1000.0
Vcm (V) 10.0
UL Insulation Rating Viso (VRMS) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 630
Application Brief1 i
Application Note3 i
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Data Sheet1 i
Design Guide1 i
Options Data Sheet6 i
Product Change Notice (PCN)4 i
Regulatory Certificate1 i
Reliability Data Sheet1 i
Selection Guide2 i
White Papers3 i
FAQs1 i
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