Diodes Incorporated ZMV833BTA

Overview

ZMV833BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and filters. It delivers 33.0 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 ZMV833BTA datasheet, ZMV833BTA pinout, ZMV833BTA application, or ZMV833BTA equivalent, key selection criteria include its SOT23 package compatibility, hyperabrupt CV slope for steep tuning response, guaranteed C₂/C₂₀ ≥5.0, IR ≤20 nA at 20 V, and −55°C to +150°C operating range - all critical for stable RF frequency control under thermal stress.

Technical Context

ZMV833BTA employs a hyperabrupt junction profile to achieve a steep, linearized voltage-to-capacitance transfer function ideal for narrowband VCOs and phase-locked loop reference tuning. Its doping gradient ensures predictable CV curvature with minimal hysteresis across temperature.

The device operates as a reverse-biased tunable capacitor with no forward conduction intended; its 25 V reverse breakdown rating and 200 mA absolute max forward current reflect robust transient handling while maintaining sub-nA leakage at bias voltages up to 20 V - essential for minimizing oscillator phase noise floor degradation.

Key Specifications

Pinout & Package

SOT23 package: 3-pin surface-mount outline with cathode-marked lead (Pin 1), anode (Pin 2), and cathode (Pin 3) in common-cathode dual configuration per datasheet marking "CE" and mechanical drawing.

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, ZMV833BTA offers the optimal balance of mid-band capacitance (33 pF), high Q (≥200), and proven thermal stability - making it preferred for telecom-grade VCXOs where phase noise and aging performance are prioritized over maximum tuning range.

Availability

ZMV833BTA is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation, and mobile radio VCO tuning requiring stable component supply across high-volume production cycles and long-lifecycle deployments.

Supply support for ZMV833BTA 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/TS16949-certified manufacturer specializing in high-performance analog and RF discrete semiconductors before its acquisition by Diodes Incorporated in 2008.

ZMV833BTA belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in wireless infrastructure, mobile communications, and precision timing systems - emphasizing CV linearity, leakage control, and thermal stability.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The ZMV833BTA has a reverse breakdown voltage minimum of 25 V at 10 µA test current. For reliable long-term operation, Zetex specifies a maximum continuous reverse voltage of 20 V - exceeding this risks irreversible junction degradation and increased leakage, especially above 85°C ambient.

Does ZMV833BTA require derating at elevated temperatures?

Yes. While the device operates from −55°C to +150°C, reverse leakage current doubles approximately every 10°C rise above 25°C. At 125°C, IR may reach ~2 nA at 20 V - requiring careful bias network design to avoid thermal runaway in high-density RF layouts.

Is the SOT23 package lead-free and RoHS compliant?

Yes. Per Zetex's Green Compliance statement in Issue 11 (2007), all 830-series devices including ZMV833BTA meet EU RoHS Directive 2002/95/EC requirements, with lead-free terminations and halogen-free molding compounds verified through material declarations and testing.

Can ZMV833BTA be used in series or parallel configurations?

Yes - its common-cathode dual-anode structure (Pins 2 & 3 anodes, Pin 1 cathode) supports both configurations. Parallel connection doubles capacitance with matched CV curves; series connection halves effective capacitance and improves voltage rating, though mismatched diodes cause nonlinear tuning.