Wide Operating Temperature R²Coupler™ 20kBd Digital Optocoupler Configurable as Low Power, Low Leakage Phototransistor

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The ACPL-M49U is a single channel, high temperature, high CMR, 20kBd digital optocoupler, configurable as a low power, low leakage phototransistor, specifically for use in industrial applications. The SO-5 JEDEC registered (MO-155) package outline is surface mountable.

This digital optocoupler uses an insulating layer between the light emitting diode and an integrated photo detector to provide electrical insulation between input and output. Separate connections for the photodiode bias and output transistor collector in a 5-pin configuration increase the speed up to a hundred times over that of a conventional phototransistor by reducing the base-collector capacitance. Common connections with the supply and output pins shorted in a 4-pin configuration delivers low power, low leakage performance as a phototransistor. The ACPL-M49U has an increased common mode transient immunity of 15kV/μs minimum at VCM = 1500V over extended temperature range.

Broadcom R²Coupler isolation products provide the reinforced insulation and reliability that delivers safe signal isolation critical in high temperature industrial applications.


  • High Temperature and Reliability low speed digital interface for Industrial Application
  • 30 kV/µs High Common-Mode Rejection at VCM = 1500 V (typ)
  • Low Power, Low leakage phototransistor in a 4-Pin configuration
  • Compact, Auto-Insertable SO5 Packages
  • Wide Temperature Range: -40°C ~ 125°C
  • Low LED Drive Current: 4mA (typ)
  • Propagation Delay: 20µs (max)
  • Worldwide Safety Approval ( Pending):
              - UL 1577, 3750 Vrms/1 min.
              - CSA File CA88324, Notice #5
              - IEC/EN/DIN EN 60747-5-5
  • Options available are:
              500 = Tape and Reel Packaging Option
              xxxE = Lead-Free Option


  • Low speed digital signal isolation interface
  • Inverter fault feedback signal isolation
  • Switching Power Supplies feedback circuit

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Product Type 3.3V/5V Digital Optocoupler
Package SO5
VDD (V) 5
IF Min. (mA) 4.0
CTR Min. (%) 32.0
CTR Max. (%) 80
Prop Delay (tPLH) Max. (µs) 20.0
Prop Delay (tPHL) Max. (µs) 20.0
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 Sheet2 i
Product Change Notice (PCN)2 i
Technical Notes1 i
FAQs1 i
Promotional Material1 i