Diodes Incorporated ZV932V2TA

Overview

ZV932V2TA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled oscillator (VCO) and temperature-compensated crystal oscillator (TCXO) tuning circuits. It delivers 17.0 pF capacitance at 1 V, 8.5 pF at 2.5 V, and 5.5 pF at 4 V reverse bias, with minimum Q of 200 at 50 MHz and typical reverse leakage of 200 pA - enabling ultra-low phase noise in RF frequency synthesis applications.

For engineers reviewing the ZV932V2TA datasheet, ZV932V2TA pinout, ZV932V2TA application, or ZV932V2TA equivalent, key selection criteria include its octave-tuning range (0–6 V), hyperabrupt C-V slope, SOD323 package footprint, low IR specification, and verified performance in VCXO/TCXO loop filters.

Technical Context

This varactor operates as a voltage-dependent capacitor in resonant tank circuits, where applied reverse bias modulates junction capacitance to shift oscillator frequency. Its hyperabrupt doping profile ensures near-linear frequency vs. voltage response over 0–6 V, critical for stable PLL-based synthesizers.

Designed for RF tuning up to 500 MHz, it maintains high Q (>200 at 50 MHz) and low temperature coefficient (300–400 ppm/°C), minimizing drift-induced frequency error in portable wireless transceivers and precision timing modules.

Key Specifications

Pinout & Package

SOD323 surface-mount package: 1.20–1.40 mm width, 2.67–3.05 mm length, 0.33–0.51 mm height; cathode-marked top-side marking "92".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with ZV932V2TA, SMV1232-011 offers higher Q and tighter C-V tolerance for premium phase-noise performance, while BBY52-02W trades capacitance and Q for smaller size and extended voltage range - guiding selection based on frequency band, noise budget, and layout constraints.

Availability

ZV932V2TA is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation networks, UHF VCOs, and pager IF filter tuning requiring stable component supply across industrial and communications product lifecycles.

Supply support for ZV932V2TA 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 Semiconductors (now part of Diodes Incorporated) specialized in high-performance analog and RF discrete semiconductors, with emphasis on low-noise, high-Q passive and active devices for timing and signal conditioning.

ZV932V2TA belongs to the ZV93x series of hyperabrupt varactors engineered specifically for low-phase-noise frequency synthesis in wireless infrastructure, precision oscillators, and portable RF systems.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 12 V, but for reliable long-term operation in temperature-stable designs, Zetex specifies 8 V as the maximum rated reverse bias. Exceeding 8 V increases leakage current exponentially and accelerates junction degradation, especially above 70°C ambient.

Does ZV932V2TA require external bias decoupling in VCO applications?

Yes - a 100 nF ceramic capacitor must be placed within 2 mm of the cathode pad to suppress RF feedthrough and stabilize the tuning voltage. Without local decoupling, VCO output exhibits spurious sidebands and increased close-in phase noise due to coupling between RF tank and bias line.

How does the SOD323 package affect thermal resistance in high-power tuning circuits?

SOD323 has a junction-to-ambient thermal resistance of ≈300°C/W. At 100 µA reverse leakage and 8 V bias, power dissipation remains below 0.8 mW - well within safe limits. Thermal effects are negligible unless used in >100 mA pulsed-bias configurations, which exceed its absolute ratings.

Can ZV932V2TA replace ZV931V2TA in an existing TCXO design?

Yes, with minor loop filter recalibration: ZV932V2TA has 26% higher C₁ᵥ (17.0 vs. 13.5 pF) and 30% lower C₄ᵥ (5.5 vs. 4.0 pF), yielding steeper C-V slope. This increases VCO gain (MHz/V), requiring proportional reduction of charge-pump current or loop filter capacitance to maintain stability.