HMC981LP3E Active Bias Controller SMT

Product Details

HMC981LP3E is an active bias controller that automatically adjusts the gate voltage of an external amplifier to achieve constant bias current. It can be used to bias any enhancement and depletion type amplifiers operating in Class-A regime with Drain voltages from 4V to 12V and drain currents up to 200mA, offering a complete biasing solution.

HMC981LP3E achieves excellent bias stability over supply, temperature and process variations, and eliminates the required calibration procedures usually employed to prevent RF performance degradation due to such variations.

The HMC981LP3E is housed in an RoHS compliant 3x3 mm QFN leadless package with an exposed backside pad to improve thermal characteristics.


  • Microwave Radio & VSAT
  • Military & Space
  • Test Instrumentation
  • Fiber Optic Modulator Driver Biasing
  • CATV Laser Driver Biasing

Features and Benefits

  • Automatic Gate voltage adjustment (No Calibration required)
  • Supply Voltage: 4V to 12V
  • Digital Voltage: 3.3V to 5V
  • Controls both Enhancement and Depletion type devices
  • Adjustable Drain Current up to 200mA
  • Sink/Source Gate Current Capability
  • Optional Internal negative voltage generation that can be disabled to use external negative rail
  • Fast Enable/Disable
  • Trigger-out Output for Daisy Chain Power-Up and Power-Down Sequencing
  • 16 Lead 3x3 mm SMT Package: 9 mm2