Diodes Incorporated ZABG6003Q20TC

Overview

ZABG6003Q20TC from Diodes Incorporated is a 6-stage GaAs/HEMT FET bias controller for satellite LNBs, operating from 2.1V–5.5V supply, delivering regulated −2V gate bias and 2.0V drain voltage per stage, with programmable 4–15mA drain current for two stages (D1/D4) and fixed 10mA for four stages (D2/D3/D5/D6), optimized for low-noise LNA input stages.

For engineers reviewing the ZABG6003Q20TC datasheet, ZABG6003Q20TC pinout, ZABG6003Q20TC application, or ZABG6003Q20TC equivalent, key selection criteria include negative rail generation capability, dual-programmable vs. quad-fixed drain current configuration, ultra-low 1.1mA quiescent supply current, −40°C to +105°C operation, and U-QFN3030-16 (Type B) package compatibility with high-density LNB PCB layouts.

Technical Context

The ZABG6003 integrates a switched-capacitor DC-DC converter generating a regulated −2.0V output (±0.5V) from a single 2.1–5.5V input, requiring only one 47nF external CSUB capacitor. Its six independent bias stages support grounded-source depletion-mode FETs, with D1/D4 current set via RCAL1 resistor (4–15mA range) and D2/D3/D5/D6 internally fixed at 10mA ±1mA.

Each stage provides current-limited gate drive (−2.5V max gate voltage) and drain voltage regulation (2.0V ±0.2V), with individual stage current limiting and fault protection during power-up/down transients or CSUB overload. Drain voltage exhibits <0.075%/V sensitivity to VDD variation and <150ppm/°C drift over temperature.

Key Specifications

Pinout & Package

U-QFN3030-16 (Type B) surface-mount package: 3.0mm × 3.0mm body, 0.4mm pitch, 0.6mm max height, exposed thermal pad (Gnd flag) on underside-requires solder connection to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET bias controller applications.

Compared with ZABG6002Q20TC and MAX2641, the ZABG6003Q20TC uniquely combines six-stage integration, on-chip −2V generation, and selective current programmability-reducing total solution size by ≥35% and eliminating ≥3 external components versus discrete alternatives.

Availability

ZABG6003Q20TC is available at Aetrix Electronics and suitable for satellite LNB design, digital twin-LNB production, and IP-based gateway development requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ZABG6003Q20TC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and precision timing solutions for industrial, automotive, and communications markets.

The ZABG series targets satellite receiver infrastructure, specifically engineered to replace multi-component bias networks in LNBs with single-chip solutions that minimize noise, maximize integration, and support extended temperature operation.

FAQ

What external components are required for basic ZABG6003Q20TC operation?

A 47nF capacitor on CSUB is mandatory for −2V rail generation. One resistor on RCAL1 sets D1/D4 current (4–15mA); no resistor is needed if those stages are unused. All other connections-VDD, Gnd, and FET drains/gates-are direct. Unused D/G pins may be left open.

Can ZABG6003Q20TC bias enhancement-mode FETs?

No. The ZABG6003Q20TC is designed exclusively for depletion-mode GaAs and HEMT FETs requiring negative gate bias in grounded-source configurations. Its −2V gate drive and current-limiting architecture do not support enhancement-mode devices, which require positive gate voltage relative to source.

How does the ZABG6003Q20TC protect external FETs during power-up?

It enforces strict −2.5V maximum gate voltage and per-stage current limiting during all transients. Gate drivers ramp slowly, and the −2V rail starts only after VDD stabilizes. If CSUB is overloaded, drain supplies fold back to prevent excessive current-ensuring FETs never experience uncontrolled bias conditions.

Is the exposed thermal pad on the U-QFN3030-16 (Type B) package electrically connected?

Yes-the exposed pad is internally tied to Gnd and must be soldered to a PCB ground plane. This connection provides both thermal dissipation (enabling 650mW operation) and low-impedance return path for gate drive currents, directly impacting noise performance and stability.