Diodes Incorporated ZV933V2TA

Overview

ZV933V2TA 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 42.0 pF capacitance at 1 V, 27.0 pF at 4 V, minimum Q of 150 at 50 MHz, reverse leakage ≤100 nA at 8 V, and operates up to 12 V reverse bias - enabling octave-range frequency tuning in compact wireless timing modules.

For engineers reviewing the ZV933V2TA datasheet, ZV933V2TA pinout, ZV933V2TA application, or ZV933V2TA equivalent, key selection criteria include its hyperabrupt C-V slope (enabling wide tuning ratio), low phase-noise contribution via sub-100 nA IR, SOD323 package compatibility with high-density RF layouts, and verified performance in VCXO loop filters operating from 10–200 MHz.

Technical Context

This varactor uses a hyperabrupt junction profile to achieve a steep, linearized C–V response across 0–6 V, supporting octave-spanning frequency adjustment in oscillator tank circuits. Its capacitance varies from 42.0 pF (1 V) to 12.0 pF (4 V), with a temperature coefficient of 300–400 ppm/°C at 3 V and 1 MHz.

Designed for RF tuning applications, it features low series resistance (implied by Q ≥150 @ 50 MHz) and minimal reverse leakage (≤100 nA @ 8 V), directly contributing to reduced close-in phase noise in oscillator designs where varactor nonlinearity and leakage-induced flicker noise dominate.

Key Specifications

Pinout & Package

Supplied in SOD323 surface-mount package (2.67 × 1.20 × 0.95 mm), with cathode marked by band. Dual-terminal configuration: Anode and Cathode only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMV1232-011 and BBY52-02W, ZV933V2TA offers balanced tuning range (42→12 pF), proven reliability in industrial TCXOs, and optimal trade-off between SOD323 manufacturability and RF performance - making it preferred for cost-sensitive, high-volume wireless infrastructure timing modules.

Availability

ZV933V2TA is available at Aetrix Electronics and suitable for VCXO design, TCXO pulling circuits, and RF front-end tunable filters requiring stable component supply across automotive infotainment, industrial telemetry, and legacy two-way radio production.

Supply support for ZV933V2TA 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 plc (now part of Diodes Incorporated) was a UK-based designer of high-performance analog and RF semiconductors, focused on precision discrete components for timing, signal conditioning, and power management.

ZV933V2TA belongs to the ZV93x hyperabrupt varactor family, engineered specifically for low-phase-noise oscillator tuning in wireless infrastructure and portable communications equipment operating from 10 MHz to 2 GHz.

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-compensated oscillators, Zetex specifies derated use at ≤8 V to maintain reverse leakage below 100 nA and avoid junction degradation. Operation above 10 V increases risk of parametric drift after thermal cycling.

Does ZV933V2TA have a specified series resistance (R_s) value?

No R_s value is published in the datasheet; however, the minimum Q of 150 at 50 MHz implies an effective series resistance of ≤1.3 Ω (calculated from Q = 1/(2πfCR_s)). This inferred R_s is consistent with SOD323-packaged hyperabrupt diodes and sufficient for VCO tank quality factors up to 100.

Can ZV933V2TA be used in dual-common-cathode configurations?

ZV933V2TA is a single-diode device in SOD323. The ZV933xx series includes dual variants (e.g., ZV933V2TA is single; ZV933D2TA would be dual), but this specific order code denotes a single hyperabrupt varactor. For dual common-cathode use, ZV933D2TA or ZMV933TA must be selected instead.

How does temperature affect capacitance tuning linearity?

At 3 V bias and 1 MHz, the temperature coefficient is 300–400 ppm/°C, causing ~0.3–0.4 % capacitance shift per °C. This introduces predictable curvature in C–V slope across temperature, requiring either analog compensation or digital lookup tables in closed-loop VCXOs targeting ±1 ppm stability over –40°C to +85°C.