The HXT4101A VCSEL driver is a key component for compact, high-performance, low-power optical modules. In conjunction with the VCSEL, the chip handles the complete digital-to-optical conversion, including CML input, laser driver, drive control, and supervision.

The HXT4101A can be used in standalone mode (no microcontroller need), or in an I2C-controlled mode. The I2C interface and the embedded monitoring circuits enable fully programmable OSAs with co-packaged VCSEL and driver, for example low-power SFP+ modules using Smart TO-cans®.

Both operational modes require a small number of additional components resulting in low cost, compact, high yield assemblies.

Key Features

  • Low power consumption of 65 mW per channel while delivering 7 mA average and 7 mA modulation current
  • 10 mA Average and 10 mA Modulation current max.
  • 15 mA burn-in current max.
  • Complete set of control and diagnostic features
  • A/D read-out of temperature, effective VCSEL current and monitor photo-current
  • I2C control interface
  • Standalone modes for operation without microcontroller

Applications List

  • OC-192/STM-64 transmission systems
  • 10GBASE-SR
  • 2G/4G/8G/16G Fiber Channel
  • USB 4.0 active optical cables
  • SONET OC-192 with dual FEC
  • Avionic optical interconnects

Ordering Information

PartTemperature RangePin-Package
HXT4101A -DNT -40 °C to +100 °CBare Die 1.1 mm x 1.1 mm