Diodes Incorporated ZMV930TA

Overview

ZMV930TA from Zetex Semiconductors is a 12 V hyperabrupt silicon varactor diode in SOT23 package, designed for voltage-controlled frequency tuning in oscillator circuits. It delivers 8.7 pF capacitance at 1 V, 4.3 pF at 2.5 V, and exhibits low reverse leakage (typ. 200 pA) and high Q (≥200 at 50 MHz, VR = 4 V), enabling low-phase-noise VCXO/TCXO designs for wireless infrastructure.

For engineers reviewing the ZMV930TA datasheet, ZMV930TA pinout, ZMV930TA application, or ZMV930TA equivalent, key selection criteria include its octave-tuning range (0–6 V), tight C-V tolerance, SOT23 thermal dissipation (330 mW), and verified performance in RF frequency synthesis and mobile radio front-ends.

Technical Context

The ZMV930TA employs a hyperabrupt junction profile to achieve linearized frequency vs. control voltage response over 0–6 V, critical for stable PLL-based synthesizers. Its capacitance varies from 8.7 pF (VR = 1 V) to 2.9 pF (VR = 4 V), with a temperature coefficient of 300–400 ppm/°C at 3 V and 1 MHz.

Designed for RF biasing in oscillator tanks, it operates within absolute max ratings of 12 V reverse voltage and 100 mA forward current. The SOT23 package supports surface-mount reflow while maintaining thermal resistance suitable for continuous RF tuning applications at ambient temperatures up to +125°C.

Key Specifications

Pinout & Package

SOT23 package: 3-terminal surface-mount plastic case with gull-wing leads; standardized outline per JEDEC TO-236AB. Thermal pad not present; power dissipation rated at 330 mW at T_amb = 25°C.

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, the ZMV930TA provides superior phase noise performance due to its lower leakage and higher Q, making it preferred for telecom infrastructure timing, while its 12 V rating ensures robustness in noisy RF environments where transient suppression is essential.

Availability

ZMV930TA is available at Aetrix Electronics and suitable for VCXO design, TCXO manufacturing, and mobile radio transceiver development requiring stable component supply across production lifecycles.

Supply support for ZMV930TA 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 was a UK-based designer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008; legacy Zetex parts maintain industrial-grade reliability and specification integrity.

The ZC930/ZMV930/ZV931 series targets precision RF tuning applications, specifically engineered to meet the C-V linearity, Q, and leakage demands of carrier-grade frequency control in wireless infrastructure and navigation systems.

FAQ

What is the maximum reverse voltage rating for ZMV930TA?

The ZMV930TA has a minimum reverse breakdown voltage of 12 V at I_R = 10 µA, with an absolute maximum reverse voltage rating of 12 V. Operation above this voltage risks irreversible junction damage. Designers must ensure tuning voltage never exceeds 12 V, including ripple and transients, even though typical tuning occurs between 0–6 V.

Does ZMV930TA require external biasing components for VCXO use?

Yes - ZMV930TA requires a clean, low-noise DC bias applied to its anode through a high-value RF choke or resistor (typically 10–100 kΩ), while the cathode connects to RF ground. A bypass capacitor (e.g., 100 pF NP0) must be placed close to the cathode to shunt RF away from the bias source and prevent modulation of the control voltage.

Is ZMV930TA RoHS compliant and lead-free?

Yes - ZMV930TA was manufactured under Zetex's RoHS-compliant process prior to the 2008 acquisition. It meets EU Directive 2011/65/EU and contains ≤0.1 wt% lead, with lead-free solderability verified per J-STD-020. Full compliance documentation is available upon request from Aetrix Electronics.

Can ZMV930TA be used in dual-diode configurations?

No - ZMV930TA is a single-diode device in SOT23 package. Dual common-cathode variants exist in the same family (e.g., ZMV931TA), but ZMV930TA has only one active junction. Attempting to parallel two ZMV930TAs will cause mismatched C-V tracking and degraded phase noise; use ZMV931TA or ZMV932TA for dual-junction implementations.