Diodes Incorporated ZMV834BTC

Overview

ZMV834BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 47.0 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 (200 pA typ.), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure and mobile radio front-ends.

For engineers reviewing the ZMV834BTC datasheet, ZMV834BTC pinout, ZMV834BTC application, or ZMV834BTC equivalent, key selection criteria include its hyperabrupt CV slope for steep tuning response, SOT23 package compatibility with high-density RF layouts, guaranteed C₂/C₂₀ ≥ 5.0, and verified operation up to +150°C ambient.

Technical Context

ZMV834BTC employs a hyperabrupt junction profile to achieve a steep, linearized voltage-to-capacitance transfer function-critical for stable frequency pulling in voltage-controlled crystal oscillators. Its doping gradient is engineered to yield predictable CV characteristics across 2–20 V reverse bias, with tight process control ensuring ±5% capacitance tolerance at VR = 2 V.

The device operates as a voltage-variable capacitor in resonant tank circuits, where its high Q (>200 @ 50 MHz) minimizes insertion loss and phase noise degradation. Low IR (≤20 nA max at VR = 20 V) ensures minimal DC loading on tuning voltage sources and preserves oscillator loop stability under temperature variation.

Key Specifications

Pinout & Package

ZMV834BTC is housed in a standard SOT23 plastic surface-mount package (JEDEC TO-236AB), with cathode-marked lead identification and 330 mW power dissipation rating at 25°C ambient.

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, ZMV834BTC provides the optimal balance of tuning ratio, Q, and temperature coefficient for mid-range stability TCXOs-delivering 5.0× C₂/C₂₀ with 200 Q and 350 ppm/°C tempco in a thermally robust SOT23 package.

Availability

ZMV834BTC is available at Aetrix Electronics and suitable for VCXO reference tuning, mobile radio front-end matching, and wireless infrastructure filtering requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ZMV834BTC 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 manufacturer specializing in high-performance analog and RF discrete semiconductors before its acquisition by Diodes Incorporated in 2008.

ZMV834BTC belongs to the 830-series hyperabrupt varactor family, designed specifically for precision frequency control in telecommunications oscillators and tunable RF filters where CV linearity and low phase noise are critical.

FAQ

What is the maximum reverse voltage rating for ZMV834BTC?

ZMV834BTC has a guaranteed minimum reverse breakdown voltage of 25 V at IR = 10 µA, with absolute maximum continuous reverse voltage rated at 20 V for reliable long-term operation in production designs. Exceeding 20 V risks irreversible junction degradation and increased leakage current.

Does ZMV834BTC require derating at elevated temperatures?

Yes-reverse leakage current increases exponentially above 25°C; at +125°C, IR may reach 5 nA (still within 20 nA max spec). Power dissipation must be limited to ≤150 mW above 70°C ambient to maintain junction temperature below 150°C, per SOT23 thermal resistance data.

Can ZMV834BTC be used in dual-common-cathode configurations?

No-ZMV834BTC is a single-diode variant in SOT23. Dual configurations (e.g., ZMDC834) use SOD323 packages with shared cathode pins; substituting ZMV834BTC into dual layouts will result in open-circuit behavior and failed tuning function.

Is ZMV834BTC RoHS-compliant and halogen-free?

Yes-ZMV834BTC conforms to EU RoHS Directive 2011/65/EU and is manufactured with halogen-free molding compound. Certificate of Compliance (CoC) and material declarations are available upon request through Aetrix Electronics' technical support portal.