Diodes Incorporated ZMV930TC

Overview

ZMV930TC from Zetex Semiconductors is a 12 V hyperabrupt silicon varactor diode in SOD323 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 2.9 pF at 4 V reverse bias, with minimum Q of 200 at 50 MHz and typical reverse leakage of 200 pA - enabling low-phase-noise VCXO/TCXO designs for wireless infrastructure.

For engineers reviewing the ZMV930TC datasheet, ZMV930TC pinout, ZMV930TC application, or ZMV930TC equivalent, key selection criteria include its octave tuning range (0–6 V), tight C-V tolerance, high Q at RF frequencies, and SOD323 footprint compatibility with space-constrained timing modules.

Technical Context

The ZMV930TC employs a hyperabrupt junction profile to achieve near-linear frequency vs. voltage response in VCO and VCXO loops. Its capacitance varies from 8.7 pF to 2.9 pF across 0–6 V, supporting octave-spanning tuning while maintaining C-V monotonicity and low hysteresis.

Designed for RF signal path integration, it operates up to 12 V reverse bias with <100 nA leakage at 8 V and exhibits a temperature coefficient of capacitance of +300 to +400 ppm/°C at 3 V and 1 MHz - critical for TCXO compensation network stability.

Key Specifications

Pinout & Package

SOD323 surface-mount package: cathode-marked anode-cathode configuration; compact 1.25 mm × 0.85 mm body with 0.37–0.53 mm lead pitch; optimized for reflow assembly in timing modules.

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, ZMV930TC offers optimal balance of octave tuning (8.7→2.9 pF), SOD323 size, and Q≥200 - making it the preferred choice for compact 10–100 MHz VCXO/TCXO modules where both range and noise matter.

Availability

ZMV930TC is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation networks, wireless transceiver VCOs, and pager IF filter tuning requiring stable component supply across automotive-grade temperature cycling and long-lifecycle production.

Supply support for ZMV930TC 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 focus on precision timing, signal integrity, and power efficiency.

The ZC930/ZMV930/ZV931 series was engineered specifically for voltage-controlled oscillator and temperature-compensated oscillator applications demanding tight C–V matching, low leakage, and high RF Q in miniature packages.

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 VCXO circuits, Zetex specifies 8 V as the maximum continuous reverse bias. At 8 V, reverse leakage remains ≤100 nA, ensuring minimal tuning voltage drift and phase noise impact over temperature and time.

Does ZMV930TC have a specified capacitance temperature coefficient?

Yes - the temperature coefficient of capacitance is +300 to +400 ppm/°C measured at VR = 3 V and f = 1 MHz. This positive, linear coefficient is intentionally matched to the negative frequency drift of AT-cut quartz crystals, enabling direct analog compensation in TCXO designs without additional active circuitry.

Is ZMV930TC supplied with cathode marking on the SOD323 package?

Yes - the SOD323 package features a visible cathode band (dark stripe) aligned per JEDEC standard orientation. The cathode terminal is electrically connected to the marked side and serves as the control voltage input node in reverse-biased operation, while the unmarked end is the anode.

Can ZMV930TC be used in dual-common-cathode configurations?

No - ZMV930TC is a single-diode device in SOD323 package. Dual-common-cathode variants (e.g., ZMV931TA) exist in the same series but use SOT-23 packaging. The ZMV930 designation explicitly indicates single-diode construction; mixing configurations risks incorrect biasing and degraded C–V linearity.