Diodes Incorporated ZABG6003JB20TC

Overview

ZABG6003JB20TC from Diodes Incorporated is a 6-stage GaAs/HEMT FET bias controller for satellite LNBs, operating from 2.1V–5.5V supply with ultra-low 1.1mA quiescent current. It delivers regulated 2.0V drain voltage and programmable (4–15mA) or fixed (10mA) drain currents across six stages, plus integrated -2V negative rail generation via switched-capacitor DC-DC converter using one external 47nF capacitor.

For engineers reviewing the ZABG6003JB20TC datasheet, ZABG6003JB20TC pinout, ZABG6003JB20TC application, or ZABG6003JB20TC equivalent, key selection factors include dual-programmable vs. four-fixed FET bias stages, -40°C to +105°C operation, U-QFN3030-16 (Type B) package compatibility, and dynamic FET protection during power transients.

Technical Context

The ZABG6003 implements a multi-stage bias architecture where D1/G1 and D4/G4 drain currents are set externally via RCAL1 resistor (4–15mA), while D2/G2, D3/G3, D5/G5, and D6/G6 are internally fixed at 10mA. Each stage features independent current limiting and gate drive clamping to ≤ –2.5V.

Its on-chip switched-capacitor DC-DC converter generates a regulated –2.0V output (±0.5V) at CSUB pin using only one 47nF external capacitor, enabling single-supply operation for depletion-mode FETs in grounded-source LNA configurations typical in satellite downconverters.

Key Specifications

Pinout & Package

U-QFN3030-16 (Type B) surface-mount package with exposed thermal pad; 3.0mm × 3.0mm footprint, 0.5mm pitch, 0.6mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZABG6002JA16TC, the ZABG6003JB20TC adds two extra bias stages and RCAL1 programmability for noise-sensitive front ends; versus MAX2641, it provides full six-stage coordinated biasing with integrated –2V rail-enabling compact, high-channel-count LNB architectures unachievable with single-stage alternatives.

Availability

ZABG6003JB20TC is available at Aetrix Electronics and suitable for satellite LNBs, digital broadcast receivers, and IP-based satellite gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZABG6003JB20TC 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 LNBs, delivering minimal-component, low-power FET bias control with integrated negative rail generation-designed specifically for noise-critical, thermally demanding outdoor RF front-ends.

FAQ

What is the function of the RCAL1 pin on ZABG6003JB20TC?

The RCAL1 pin sets the drain current for FET stages D1 and D4 via an external resistor, enabling programmable current from 4mA to 15mA. This allows optimization of noise figure in the first LNA stage while keeping other stages fixed at 10mA for gain stability and reduced component count.

Can unused drain and gate pins be left unconnected?

Yes-unused drain (D2–D6) and gate (G2–G6) pins may be left open-circuit without affecting operation of active bias stages. The device's architecture isolates each stage, and floating pins do not induce leakage, instability, or thermal issues under specified operating conditions.

What external components are mandatory for basic operation?

Two components are mandatory: a 47nF capacitor between CSUB and GND for the integrated –2V negative rail generator, and a single resistor from RCAL1 to GND to set D1/D4 drain current. No additional capacitors, resistors, or inductors are required for core six-stage bias functionality.

Does ZABG6003JB20TC support operation below 2.1V supply?

No-the absolute minimum supply voltage is 2.1V per datasheet specifications. Operation below this threshold risks failure of the internal oscillator and DC-DC converter, resulting in loss of –2V rail and unregulated drain voltages. The 2.1V lower limit is strictly enforced across –40°C to +105°C.