Diodes Incorporated ZMV832BTA

Overview

ZMV832BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 22.0 pF nominal capacitance at VR = 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), Q ≥ 200 at 50 MHz, and ultra-low reverse leakage (typ. 200 pA), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure and mobile radio transceivers.

For engineers reviewing the ZMV832BTA datasheet, ZMV832BTA pinout, ZMV832BTA application, or ZMV832BTA equivalent, key selection criteria include its SOT23 package compatibility, hyperabrupt CV slope for steep tuning response, guaranteed C₂/C₂₀ ≥ 5.0, and operation up to +150°C ambient - critical for stable RF front-end biasing and VCO calibration circuits.

Technical Context

ZMV832BTA employs a hyperabrupt junction profile to achieve a steep, linearized voltage-to-capacitance transfer function ideal for high-stability oscillator control loops. Its capacitance varies from 20.9 pF (min) to 23.1 pF (max) at VR = 2 V and drops to ~4.4–4.6 pF at VR = 20 V, yielding a verified C₂/C₂₀ ratio of ≥5.0.

The device operates with reverse breakdown voltage ≥25 V and exhibits temperature coefficient of capacitance between 300–400 ppm/°C, requiring thermal compensation in wide-temperature-range TCXOs. Its SOT23 package supports reflow-compatible surface-mount assembly while maintaining low parasitic inductance for RF impedance matching.

Key Specifications

Pinout & Package

ZMV832BTA is housed in a standard SOT23 plastic surface-mount package (JEDEC TO-236AB), with cathode-marked lead identification and 1.9 mm × 1.3 mm footprint. Thermal resistance θ_JA ≈ 300°C/W; max power dissipation = 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 SMV2023-011LF and BBY58-02V, ZMV832BTA offers the optimal balance of tuning ratio (≥5.0), mid-range capacitance (22 pF), and proven thermal stability - making it preferred for TCXO and multi-band mobile radio VCOs where both range and repeatability are critical.

Availability

ZMV832BTA is available at Aetrix Electronics and suitable for VCXO frequency control, TCXO temperature compensation, and mobile radio transceiver VCO designs requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for ZMV832BTA 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.

ZMV832BTA belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in wireless timing systems - emphasizing tight CV matching, high Q, and robust thermal performance over -55°C to +150°C.

FAQ

What is the maximum reverse voltage rating for ZMV832BTA?

ZMV832BTA has a minimum reverse breakdown voltage of 25 V at I_R = 10 µA, verified per Zetex Issue 11 datasheet. It is rated for continuous reverse operation up to 20 V; exceeding this risks irreversible junction degradation and capacitance drift. Derating to ≤15 V is recommended for long-life telecom applications.

Does ZMV832BTA require bias current limiting in VCXO circuits?

No external current-limiting resistor is required because ZMV832BTA draws only 0.2–20 nA leakage at VR = 20 V. However, a 100 kΩ series resistor is recommended between the DAC output and anode to suppress control-line noise injection, especially in sensitive phase-locked loop environments.

Is ZMV832BTA RoHS compliant and lead-free?

Yes - Zetex confirmed full RoHS compliance for the 830 series in the January 2007 datasheet, including ZMV832BTA. The SOT23 package uses lead-free matte tin plating, and all materials meet EU Directive 2011/65/EU requirements without exemptions.

Can ZMV832BTA be substituted with ZMV832ATA in the same PCB footprint?

Yes - both ZMV832ATA and ZMV832BTA share identical SOT23 packaging, pinout, and thermal characteristics. The 'A' and 'B' suffixes denote tighter capacitance bins (±5% vs. ±2.5% at VR = 2 V); ZMV832BTA offers improved matching for high-precision VCO calibration without layout changes.