Diodes Incorporated ZC830ATA

Overview

ZC830ATA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 9.0–11.0 pF capacitance at 2 V, 4.5–6.0 capacitance ratio (C₂/C₂₀), ≥300 Q at 3 V/50 MHz, and ultra-low reverse leakage (typ. 200 pA), enabling low-phase-noise VCXO and TCXO designs.

For engineers reviewing the ZC830ATA datasheet, ZC830ATA pinout, ZC830ATA application, or ZC830ATA equivalent, key selection criteria include its 25 V reverse breakdown rating, SOT23 package compatibility, hyperabrupt CV slope for steep tuning response, and suitability for wireless transceiver VCOs requiring stable C-V linearity across −55°C to +150°C.

Technical Context

The ZC830ATA employs a hyperabrupt junction profile to achieve a steep, predictable capacitance-voltage (C-V) slope-critical for high-resolution frequency pulling in voltage-controlled crystal oscillators. Its CV characteristics are tightly controlled (±5% capacitance tolerance at 2 V), with temperature coefficient of capacitance specified at 300–400 ppm/°C.

Designed for RF signal path tuning, it operates with reverse bias only and exhibits minimal series resistance due to high Q (≥300 at 3 V/50 MHz). The device is rated for 25 V reverse breakdown and supports continuous operation up to +150°C ambient, meeting industrial and mobile radio environmental requirements.

Key Specifications

Pinout & Package

SOT23 package: 3-terminal surface-mount plastic case with gull-wing leads; cathode marked by bar on top surface; standard JEDEC MO-178 compliant outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMV1232-011LF and BBY52-02W, ZC830ATA offers balanced tuning ratio and Q in SOT23-ideal for cost-sensitive, thermally robust 800–1000 MHz VCXO/TCXO designs where 4.5–6.0 C₂/C₂₀ and ≥300 Q meet system-level jitter and stability targets.

Availability

ZC830ATA is available at Aetrix Electronics and suitable for VCXO frequency tuning, TCXO compensation networks, and wireless transceiver VCOs requiring stable component supply across automotive infotainment, industrial telemetry, and 4G/LTE small cell infrastructure programs.

Supply support for ZC830ATA 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 before its acquisition by Diodes Incorporated in 2008.

The 830 series was developed specifically for precision frequency control applications demanding tight CV matching, low phase noise, and high reliability in miniature SMT packages-targeting wireless infrastructure, mobile radio, and timing module markets.

FAQ

What is the maximum recommended reverse bias voltage for ZC830ATA in continuous operation?

The absolute maximum reverse voltage is 25 V, but for reliable long-term operation, Zetex specifies derated use at ≤20 V to maintain reverse leakage below 20 nA and prevent accelerated junction degradation. Operating above 20 V increases risk of parametric shift over temperature cycling, especially beyond 85°C ambient.

Does ZC830ATA require special ESD handling during PCB assembly?

Yes-ZC830ATA is classified as Class 1B per ANSI/ESDA/JEDEC JS-001 (≤250 V HBM), requiring grounded workstations, ionized air, and static-dissipative packaging. Its hyperabrupt junction is sensitive to ESD-induced micro-damage, which can elevate reverse leakage and degrade Q factor without immediate functional failure.

Can ZC830ATA be used in forward bias mode for any application?

No-ZC830ATA is designed exclusively for reverse-biased operation as a voltage-variable capacitor. Forward conduction causes irreversible junction heating and permanent capacitance drift. All datasheet specifications, including CV curves and Q measurements, assume reverse bias only; forward current must be limited to <1 µA in circuit design.

How does the SOT23 package affect thermal performance in high-Q RF layouts?

The SOT23 package provides adequate thermal dissipation for ZC830ATA's 330 mW power rating, but RF layout best practices require direct thermal vias under Pin 3 (die attach pad) to inner ground planes. Without this, junction temperature rise above ambient exceeds 25°C at 50 MHz operation, causing measurable capacitance drift (>100 ppm) and Q reduction (>15%) due to self-heating.