Diodes Incorporated ZMV830ATC

Overview

ZMV830ATC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 10.0 pF nominal capacitance at 2 V, 4.5–6.0 capacitance ratio (C₂/C₂₀), ≥300 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.

For engineers reviewing the ZMV830ATC datasheet, ZMV830ATC pinout, ZMV830ATC application, or ZMV830ATC equivalent, key selection criteria include its hyperabrupt CV slope, SOT23 package compatibility, 25 V reverse breakdown rating, and verified performance in 2–20 V tuning range under 25°C ambient conditions.

Technical Context

ZMV830ATC operates as a voltage-variable capacitor whose junction capacitance varies nonlinearly with applied reverse bias-specifically engineered with hyperabrupt doping profile to yield steep dC/dV slope for enhanced tuning sensitivity in oscillator control loops. Its CV curve is tightly controlled across production lots, ensuring predictable frequency pullability in TCXO compensation networks.

The device exhibits minimal temperature coefficient of capacitance (300–400 ppm/°C) and maintains high Q (>300 at 50 MHz) up to 20 V reverse bias, supporting stable phase noise performance in narrowband VCOs and band-select filtering stages where loss and tuning linearity are critical.

Key Specifications

Pinout & Package

Supplied in SOT23 surface-mount package (JEDEC TO-236AB), with cathode-marked lead configuration. Standard pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Not connected (NC) - confirmed per Zetex SOT23 outline drawing Issue 11, page 5.

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, ZMV830ATC offers optimal balance of tuning ratio, Q, and leakage for mid-band VCXOs-its 10 pF C₀ and 4.5–6.0 C₂/C₂₀ deliver predictable 30–50 ppm/V sensitivity in 10–100 MHz designs without sacrificing phase noise floor.

Availability

ZMV830ATC is available at Aetrix Electronics and suitable for VCXO frequency control, TCXO temperature compensation, and wireless base station VCO applications requiring stable component supply, tight CV matching, and RoHS-compliant SMT packaging.

Supply support for ZMV830ATC 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 designer and manufacturer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008.

ZMV830ATC belongs to the 830-series hyperabrupt varactor family, developed specifically for precision frequency control in telecom oscillators and tunable RF filters where CV linearity, low leakage, and high Q are essential.

FAQ

What is the maximum recommended reverse voltage for continuous operation of ZMV830ATC?

The absolute maximum reverse voltage is 25 V, but Zetex specifies derated operation at ≤20 V for long-term reliability. At 20 V, reverse leakage remains ≤20 nA and capacitance retains ≥95% of its C₂₀ value-making 20 V the practical upper limit for stable VCXO bias networks.

Does ZMV830ATC require special ESD handling during PCB assembly?

Yes-ZMV830ATC is classified as Class 1B per JEDEC JS-001 (≤250 V HBM). Standard SMT ESD controls apply: grounded workstations, ionized air, and wrist straps. No special pre-bake or moisture sensitivity precautions are needed, as it is rated MSL-1 with unlimited floor life.

Can ZMV830ATC be used in dual-common-cathode configurations?

No-ZMV830ATC is a single-diode variant in SOT23. Dual configurations (e.g., ZMDC830) exist in SOT323 but are distinct orderable parts. The ZMV prefix denotes single hyperabrupt diodes; ZMDC indicates dual common-cathode versions with separate anodes.

How does the 300–400 ppm/°C temperature coefficient affect TCXO design?

This tempco introduces ~0.5–0.7 ppm/°C frequency drift per pF of capacitance shift. In a TCXO using ZMV830ATC, the compensation network must generate opposing voltage slope to cancel this effect-typically achieved via thermistor-based op-amp circuitry calibrated to match the diode's measured tempco across –40°C to +85°C.