Diodes Incorporated ZMV932TC

Overview

ZMV932TC from Zetex Semiconductors is a 12 V hyperabrupt silicon varactor diode in SOT-23 package, designed for voltage-controlled frequency tuning in oscillator 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 low-phase-noise VCXO/TCXO designs for wireless infrastructure.

For engineers reviewing the ZMV932TC datasheet, ZMV932TC pinout, ZMV932TC application, or ZMV932TC equivalent, key selection criteria include its octave-tuning range (0–6 V), tight C-V tolerance, SOT-23 thermal dissipation (330 mW), and verified performance in RF filtering and mobile radio VCOs.

Technical Context

This varactor operates as a voltage-dependent capacitor where junction capacitance varies inversely with applied reverse bias. Its hyperabrupt doping profile yields near-linear frequency vs. voltage response in VCOs, supporting octave tuning from 0 to 6 V with controlled CV slope.

Electrical behavior is characterized at 25°C with IR ≤100 nA at VR = 8 V, temperature coefficient of capacitance 300–400 ppm/°C at 3 V/1 MHz, and guaranteed breakdown ≥12 V - ensuring stable operation in temperature-varying TCXO modules.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package: 3-pin, single anode/cathode configuration with cathode marked by band; standard JEDEC MO-215 outline, 1.77 mm × 3.05 mm footprint, 1.37 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMV1232-011 and BBY40-02W, ZMV932TC offers optimal balance of octave tuning linearity, SOT-23 thermal handling, and proven 200-Q performance in production TCXOs - making it preferred for cost-sensitive, volume-manufactured wireless timing modules.

Availability

ZMV932TC is available at Aetrix Electronics and suitable for VCXO modules, TCXO reference oscillators, and mobile radio VCOs requiring stable component supply with traceable lot history and RoHS-compliant packaging.

Supply support for ZMV932TC 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 Diodes Incorporated) is a UK-based analog semiconductor specialist focused on high-performance discrete devices for RF, power, and signal conditioning.

The ZMV93x series was engineered specifically for precision frequency control in communications oscillators, emphasizing C–V linearity, low leakage, and miniature SMT reliability in harsh RF environments.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 12 V, but continuous operation should be limited to ≤6 V to maintain specified C–V linearity and avoid accelerated aging. Derating to 5 V is advised for 10-year field reliability in telecom-grade TCXOs, as confirmed by Zetex reliability testing under JEDEC JESD22-A108.

Can ZMV932TC be used in dual-common-cathode configurations?

No - ZMV932TC is a single-diode device in SOT-23. Dual common-cathode variants (e.g., ZMV932D) exist in SOT-363 but are not interchangeable. Pin 3 is NC, not a second cathode; attempting dual use risks mismatched C–V tracking and thermal imbalance.

How does temperature affect capacitance tuning accuracy?

Capacitance exhibits 300–400 ppm/°C tempco at 3 V/1 MHz. In a 10 MHz TCXO, this contributes ~0.5 ppm/°C drift - compensated in system-level design via thermistor networks or digital calibration. Data sheet specifies tempco only at VR = 3 V; variation increases slightly at 1 V and 4 V.

Is tape-and-reel packaging available for prototype quantities?

Yes - ZMV932TC is supplied in 7-inch reels (TA code) containing 3,000 units on 8 mm tape. Sample kits of 50 pcs in static-shielded trays are also available through Aetrix Electronics' engineering support program with full traceability and test data.