The HXR44400 Transimpedance Linear Amplifier quad channel array is a member of IDT’s family of Optical Receiver Transmitter Array (ORTA) products for PAM4 modulation format targeted at the parallel optical links market. Together with a PIN detector array or discrete detectors, high-capacity, high-availability optical link can be designed for next-generation Ethernet and datacom applications. The 3.3V SiGe device integrates the linear transimpedance preamplifier, the linear post-amplifier, and a versatile CML output stage for four optical channels.


  • High receiver sensitivity for 56Gbps PAM4 signal
  • Up to 3mApp overload
  • Independent, per channel RSSI
  • 5kΩ typical differential gain
  • 500mVppd output voltage swing and adjustable output swing
  • Linear operation with internal AGC
  • 150mW per channel power consumption
  • QSFP56 MSA compliance
  • Optimized for isolated and common cathode photo-detector arrays from multiple vendors

Product Options

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Technical Documentation

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Datasheets & Errata
HXR44400 Short-Form Datasheet Short Form Datasheet PDF 122 KB