Automotive R²Coupler™ 1MBd Transistor Output Optocoupler in Stretched SO-8 Package with 8mm Creepage & Clearance

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The ACPL-K43T is a single channel, high temperature, high CMR, high-speed digital automotive IPM optocoupler in an eight lead miniature footprint.  specifically used in the automotive applications.  The ACPL-K44T is a dual channel equivalent of the ACPL-K43T.  Both products are available in the stretched SO-8 pakcage outline meeting 8mm creepage and clearance requirements, designed to be compatible with standard surface mount process.

This digital IPM 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 increase the speed up to a hundred times over that of a conventional photo-transistor coupler by reducing the base-collector capacitance.

The ACPL-K43T and ACPL-K44T IPM optocoupler have an increased common mode transient immunity of typical 30kV/µs minimum at VCM = 1500V guaranteed 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 IPM Driver for Automotive Application
  • Ultra Low Drive for staus feedback at IF = 0.8mA or 1.5mA
  • 30 kV/µs High Common-Mode Rejection at VCM = 1500 V (typ)
  • Compact, Auto-Insertable Stretched SO8 Packages
  • 8mm Creepage and Clearance
  • Wide Temperature Range: -40°C to +125°C
  • High Speed: 1MBd
  • Low Propagation Delay: 1µs max at IF = 10mA
  • Qualified according to AEC-Q100 Test Guidelines
  • Worldwide Safety Approval:
- UL 1577 approval, 5000 VRMS/1 min.
- CSA Component Acceptance Notice 5
- IEC 60747-5-5, EN/DIN EN 60747-5-2 


  • Automotive IPM Driver for DC-DC converters and motor inverters
  • Status Feedback and Wake-Up Signal Isolation
  • CANBus and SPI Communications Interface
  • High Temperature Digital/Analog Signal Isolation

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
Distrib. Inventory Yes
Product Type Automotive Optocoupler
CMR (min.) (V/µs) 15000.0
Vcm (V) 1500.0
CTR Max. (%) N.A.
CTR Min. (%) 32.0
IF Min. (mA) 10.0
RoHS6 Compliant Pb & Pb-free options available
Operating Temperature Range -40°C to +125°C
Package Stretched SO8
UL Insulation Rating Viso (VRMS) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 1140.0
Prop Delay (tPHL) Max. (µs) 1 µs
Prop Delay (tPLH) Max. (µs) 1 µs
Options Data Sheet3 i
Reliability Data Sheet5 i
Selection Guide2 i
White Papers6 i
Photocard1 i


Automotive R²Coupler™ 1MBd Transistor Output Optocoupler in Stretched SO-8 Package with 8mm Creepage & Clearance


Automotive 1MBd Transistor Output Optocoupler