Diodes Incorporated ZNBG2000X10TA

Overview

ZNBG2000X10TA from Zetex plc is a dual-channel GaAs/HEMT FET bias controller in MSOP-10 package, generating a regulated –3 V negative rail from a single 5–12 V supply to bias grounded-source FETs. It provides independent drain voltage regulation (2.2 V per channel), external resistor–set drain current (0–15 mA), and dynamic gate voltage limiting (–3.5 V to +0.7 V) for satellite LNB front-ends.

For engineers reviewing the ZNBG2000X10TA datasheet, ZNBG2000X10TA pinout, ZNBG2000X10TA application, or ZNBG2000X10TA equivalent, key selection criteria include dual-channel drain voltage accuracy (±0.2 V), gate drive voltage clamping range, integrated negative rail generation with only two 47 nF capacitors, and unconditional RF stability with recommended CG/CD decoupling.

Technical Context

The ZNBG2000X10TA integrates two independent bias stages, each featuring an internal oscillator-based negative voltage generator, precision V_D reference (2.2 V nominal), and current-sense amplifier driving a gate output stage. Drain current is set by external resistors RCAL1/RCAL2, with typical ID = 10 mA at R_CAL = 16 kΩ.

Gate outputs enforce strict voltage limits (–3.5 V to +0.7 V) during all transients, and fault protection shuts down drain supply if the –3 V rail is overloaded or shorted. Stability is guaranteed over –40°C to +80°C when used with 4.7 nF gate and 10 nF drain capacitors.

Key Specifications

Pinout & Package

MSOP-10 package (3.0 mm × 3.0 mm, 0.5 mm pitch), thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by dot; pin numbering follows standard MSOP convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZNBG2001X10TA, the ZNBG2000X10TA offers higher drain voltage for improved FET transconductance in high-gain LNB stages; versus MAX2641, it reduces system-level BOM count and layout complexity by integrating both bias channels and negative rail generation.

Availability

ZNBG2000X10TA is available at Aetrix Electronics and suitable for satellite receiver LNBs, private mobile radio (PMR) transceivers, and cellular base station low-noise amplifiers requiring stable component supply and long-term industrial availability.

Supply support for ZNBG2000X10TA 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

Zetex plc (now part of Diodes Incorporated) was a UK-based analog semiconductor specialist focused on high-performance discrete and analog IC solutions for RF, power management, and signal conditioning.

The ZNBG series belongs to Zetex's RF bias controller product line, designed specifically to simplify and stabilize GaAs/HEMT FET biasing in satellite, wireless infrastructure, and portable communications equipment.

FAQ

What external components are mandatory for basic operation?

The ZNBG2000X10TA requires exactly two 47 nF capacitors (CNB1 and CNB2) for its internal –3 V oscillator, one RCAL resistor to set drain current, plus 4.7 nF gate (CG) and 10 nF drain (CD) decoupling capacitors per FET channel to ensure RF stability. No additional regulators or charge pumps are needed.

Can unused bias channels be left unconnected?

Yes. Unused drain (D1/D2) and gate (G1/G2) pins may be left open-circuit without affecting operation of active channels. However, RCAL must remain connected even if only one channel is used, and CNB1/CNB2/CSUB/GND must always be populated to sustain the negative rail.

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

During power-up and power-down transients, the gate outputs are actively clamped to –3.5 V to +0.7 V regardless of supply ramp rate. If the –3 V rail (CSUB) collapses due to overload, the device disables both drain outputs to prevent uncontrolled FET conduction and thermal runaway.

Is the –3 V rail capable of powering circuits other than FET gates?

Yes. The CSUB pin delivers up to 200 µA of –3 V current and may supply auxiliary circuitry such as op-amp bias networks or level-shifters. Operation with loads exceeding 200 µA is not guaranteed per datasheet specifications.