Wide Operating Temperature Automotive R2CouplerTM 20kBd Digital Optocoupler Configurable as Low Power, Low Leakage Phototransistor

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The ACPL-M49T is a single channel, high temperature, high CMR, 20kBd digital optocoupler, configurable as a low power, low leakage phototransistor, specifically for use in the automotive 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-M49T 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 needed for critical in automotive and high temperature industrial applications.


  • High Temperature and Reliability low speed digital interface for Automotive 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, 4000 Vrms/1 min.
    - CSA File CA88324, Notice #5
    - IEC/EN/DIN EN 60747-5-5
  • Qualified to Automotive AEC-Q100 Grade 1 Stress Test Guidelines
  • Options available are:
    500 = Tape and Reel Packaging Option
    XXXE = Lead-Free Option


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

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
Distrib. Inventory Yes
IF Min. (mA) 4.0
RoHS6 Compliant Pb & Pb-free options available
Product Type Automotive Optocoupler
Package Stretched SO8
Operating Temperature Range -40°C to 125°C
AECQ100 Grade 1 Yes
CTR Max. (%) 100
CTR Min. (%) 32
PWD (max.) 8
Tpsk Max In Ns 20
CMR (min.) (V/µs) 15000.0
Vcm (V) 1500.0
UL Insulation Rating Viso (VRMS) 4000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 567.0
Prop Delay (tPHL) Max. (µs) 20
Prop Delay (tPLH) Max. (µs) 20
Application Note3 i
Data Sheet1 i
Options Data Sheet3 i
Regulatory Certificate1 i
Reliability Data Sheet5 i
Selection Guide1 i
White Papers5 i
Photocard1 i


Automotive R2 Coupler™ 20kBd Digital Optocoupler Configurable as Low Power, Low Leakage Phototransistor in Stretched SO-8 Package with 8mm Creepage & Clearance


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