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

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The ACPL-K49U is a single channel, high temperature, high CMR, 20 kBd digital optocoupler, configurable as a low power, low leakage phototransistor, specifically for use in industrial applications. The stretched SO-8 stretched package outline is designed to be compatible with standard surface mount processes.

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

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 Stretched SO8 Packages
  • Wide Temperature Range: -40°C ~ 125°C
  • Low LED Drive Current: 4mA (typ)
  • Low Propagation Delay: 20µs (max)
  • Worldwide Safety Approval ( Pending):
              - UL 1577, 5000 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


  • Industrial 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 SSO8
VDD (V) 5
IF Min. (mA) 4.0
CTR Min. (%) 65.0
CTR Max. (%) 150
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) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 1140
Product Change Notice (PCN)2 i
Reliability Data Sheet2 i
Technical Notes1 i
FAQs1 i
Application Note1 i
Promotional Material1 i