Diodes Incorporated ZMV832ATA

Overview

ZMV832ATA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators. It delivers 22.0 pF nominal capacitance at 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), ≥200 Q at 50 MHz, and ultra-low reverse leakage (200 pA typ.), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure and mobile radio front-ends.

For engineers reviewing the ZMV832ATA datasheet, ZMV832ATA pinout, ZMV832ATA application, or ZMV832ATA equivalent, key selection criteria include its SOT23 package compatibility, hyperabrupt CV slope for steep tuning response, 25 V reverse breakdown rating, and verified performance in RF filter and VCO bias networks requiring stable C-V linearity and minimal thermal drift.

Technical Context

ZMV832ATA operates as a voltage-variable capacitor with hyperabrupt doping profile, yielding a steep, predictable C–V curve essential for high-stability oscillator control. Its capacitance varies from 19.8 pF (min) to 24.2 pF (max) at VR = 2 V, f = 1 MHz, and maintains ≥200 Q at 50 MHz under 3 V bias.

The device exhibits a temperature coefficient of capacitance between 300–400 ppm/°C and supports operation from –55 °C to +150 °C. Reverse breakdown voltage is rated at 25 V minimum, with leakage current capped at 20 nA max at VR = 20 V - critical for minimizing phase noise in sensitive timing circuits.

Key Specifications

Pinout & Package

ZMV832ATA is housed in a standard SOT23 surface-mount package (3-pin, single anode/cathode configuration). Cathode is marked by a band on the package top surface; pin 1 is anode, pin 2 is cathode, pin 3 is unused (internal die attach).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMV2023-011LF and BBY52-02W, ZMV832ATA offers balanced trade-offs: superior C₂/C₂₀ for precise VCXO pulling, robust 25 V breakdown for industrial-grade bias margins, and SOT23 compatibility with legacy RF layout standards - making it optimal for cost-sensitive, high-volume wireless timing modules.

Availability

ZMV832ATA is available at Aetrix Electronics and suitable for VCXO design, RF filter tuning, and mobile radio transmitter development requiring stable component supply and consistent hyperabrupt CV performance across production lots.

Supply support for ZMV832ATA 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 ISO 9001 and TS16949-certified designer and manufacturer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008.

ZMV832ATA belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in wireless infrastructure, TCXO/VCXO modules, and tunable RF filters demanding tight CV tolerance and high Q.

FAQ

What is the maximum recommended reverse voltage for continuous operation of ZMV832ATA?

ZMV832ATA has a minimum reverse breakdown voltage of 25 V per datasheet specifications. For reliable long-term operation, Zetex recommends limiting applied reverse voltage to ≤15 V to maintain <1 nA leakage and avoid accelerated degradation. Derating to 60% of breakdown rating ensures robustness against transient spikes in RF bias networks.

Does ZMV832ATA require special PCB layout considerations for RF performance?

Yes - due to its role in high-Q resonant circuits, ZMV832ATA demands minimized parasitic inductance and capacitance. Use short, direct traces between pins 1 and 2 and the tank circuit; avoid vias near the cathode pad; implement solid RF ground plane beneath the SOT23 footprint; and isolate bias lines with RC filtering to suppress supply noise coupling into the C–V characteristic.

How does the 300–400 ppm/°C temperature coefficient affect VCXO stability?

This tempco quantifies how much capacitance changes per degree Celsius at fixed bias. In a typical VCXO, it contributes directly to frequency drift: a 40 °C ambient shift causes ~1.2–1.6% capacitance change, translating to ~24–32 ppm frequency error if uncompensated. System-level compensation (e.g., thermistor networks or digital calibration) is required to achieve sub-5 ppm total stability.

Can ZMV832ATA be used in dual-common-cathode configurations?

No - ZMV832ATA is a single-junction varactor in SOT23 package. Dual common-cathode variants (e.g., ZMDC832BTA) exist in the same 830 series but use SOD-323 packaging and separate die construction. Substituting ZMV832ATA into dual-diode layouts will result in missing functionality and incorrect biasing of the second junction.