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The ZABG4003 is an advanced GaAs and HEMT FETs bias controller designed to operate from minimal supply rails and intended primarily for satellite Low Noise Blocks (LNBs). With the addition of one capacitor and two resistors, the ZABG4003 provides drain voltage and current control for up to 4 external grounded source FETs. Generating the regulated negative rail required for FET gate biasing whilst operating from a single supply of 2.1V to 5V. The -2V negative bias can also be used to supply other external circuits. Setting drain currents on the ZABG4003 uses two resistors to split control between two pairs of FETs. This allows the operating current of input FETs to be adjusted to minimize noise, whilst the following FET stages can separately be adjusted for maximum gain.


  • Low Power LNB’s
  • Digital LNB’s
  • IP LNB’s
  • Twin LNB’s and Quad LNB’s
  • General Purpose LNA Bias


  • Provides Bias for up to 4 GaAs and HEMT FETs
  • Operating Range of 2.1V to 5V
  • Ultra-low Operating Current of 0.95mA
  • Dynamic FET Protection
  • Amplifier FET Drain Current Selectable (4mA to 15mA)
  • Regulated Negative Rail Generator Requires only 1 External Capacitor
  • Expended Temperature Range of -40°C to +105°C
  • U-QFN3030-16 (Type B) Surface Mount Package
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device

Product Specifications

Product Parameters

LNA Bias Stages 4
Mixer Bias Stages N/A
IQ 0.95 mA
VCC 5.5 V

Related Content

U-QFN3030-16 (Type B)

Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
ZABG4003JA16TC Arrow Electronics 6000 8/3/2020 Buy Now United States
ZABG4003JA16TC Mouser Electronics Inc. 2865 8/3/2020 Buy Now United States
ZABG4003JA16TC Digi-Key Electronics 2447 8/2/2020 Buy Now United States


Product Change Notices

PCN # Issue Date Subject
PCN-2429 2019-11-20 Additional Qualified (AT) Assembly Test Site + BOM + Top Marking