Low Supply Voltage 1MBd Digital Optocouplers

Currently Viewing:

The Broadcom ACPL-M51L (single-channel, SO-5 package) is a low power, low supply voltage 1Mbd digital optocoupler, configurable as a 4-pin device. 
The ACPL-M51L uses an insulating layer between the light emitting diode and an integrated photon detector to provide electrical insulation between the input and output. 
The ACPL-M51L has an increased common mode transient immunity of 15,000 V/µs minimum at VCM = 1,500 V over a temperature range of -40°C to +105°C. The current transfer ratio (CTR) is 140% typical at IF = 3 mA. This digital optocoupler can be used in any  TTL/CMOS, TTL/LSTTL or other analog applications. 



  • Wide Supply Voltage VCC: 2.25 to 24 V
  • Low Drive Current: 3 mA min
  • Open-Collector Output
  • TTL Compatible
  • Compact SO-5 Package
  • 15kV/µs High Common-Mode Rejection at VCM = 1500 V
  • Current Transfer Ratio (CTR): 140% typical
  • Operating Temperature: -40 °C to +105 °C
  • Low Propagation Delay: 1 µs max at 2.5 V and 5 V (standard config)
  • Low Logic Output Voltage of 0.2 V max (4-pin configuration)
  • Worldwide Safety Approval:
    • UL 1577 Recognized: 3,750 Vrms for 1 minute
    • CSA Approved
    • IEC 60747-5-5 Approved VIORM = 567 VPEAK
  • Available Options:
    • 500 = Tape & Reel Packaging Option
    • XXXE = Lead Free Option



  • Communications Interface
  • Digital Signal Isolation
  • Micro-controller Interface
  • Feedback Elements in Switching Power Supplies
  • Digital Isolation for A/D, D/A Conversion Digital Field

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 SO5
VDD (V) 24
IF Min. (mA) 3.0
CTR Min. (%) 80.0
CTR Max. (%) 200
Prop Delay (tPLH) Max. (µs) 1.0
Prop Delay (tPHL) Max. (µs) 1.0
CMR (min.) (V/µs) 15000.0
Vcm (V) 1500.0
UL Insulation Rating Viso (VRMS) 3750.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 567
Application Note2 i
Data Sheet1 i
Product Change Notice (PCN)1 i
Reliability Data Sheet1 i
FAQs1 i
Promotional Material1 i