Diodes Incorporated ZV831BV2TA

Overview

ZV831BV2TA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators. It delivers 15.0 pF nominal capacitance at 2 V, 4.5–6.0 capacitance ratio (C₂/C₂₀), Q ≥ 300 at 50 MHz, and ultra-low reverse leakage (typ. 200 pA), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure and mobile radio front-ends.

For engineers reviewing the ZV831BV2TA datasheet, ZV831BV2TA pinout, ZV831BV2TA application, or ZV831BV2TA equivalent, key selection criteria include its SOT23 package compatibility, hyperabrupt CV slope for steep tuning response, guaranteed C₂/C₂₀ ≥ 4.5, and operation up to +150°C ambient - critical for stable RF filtering and frequency synthesis in compact portable systems.

Technical Context

ZV831BV2TA employs a hyperabrupt junction profile engineered to produce a steep, linearized voltage-to-capacitance transfer function (dC/dV), essential for minimizing tuning nonlinearity in voltage-controlled crystal oscillators. Its 25 V reverse breakdown rating and <20 nA IR at 20 V support robust bias margin in high-stability clock circuits.

The device operates with a temperature coefficient of capacitance of 300–400 ppm/°C, requiring compensation in wide-temperature-range TCXOs. Its SOT23 package provides thermal and mechanical stability suitable for reflow-soldered RF matching networks and VCO tank circuits.

Key Specifications

Pinout & Package

Package: SOT23 - 3-pin surface-mount plastic package with gull-wing leads, 2.67–3.05 mm length, 1.20–1.40 mm width, 0.95 mm nominal height; rated P_tot = 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 ZV831BV2TA, MAVR-000120-1411 trades tuning range and Q for smaller footprint, while SMV2023-011 extends tuning linearity and noise performance at the cost of higher bias leakage - making ZV831BV2TA the balanced choice for cost-sensitive, high-volume VCXO designs requiring proven reliability and thermal stability.

Availability

ZV831BV2TA is available at Aetrix Electronics and suitable for VCXO frequency tuning, TCXO temperature compensation, and mobile radio VCO applications requiring stable component supply across automotive, industrial, and wireless infrastructure programs.

Supply support for ZV831BV2TA 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.

ZV831BV2TA belongs to the 830-series hyperabrupt varactor family, designed specifically for low-phase-noise frequency control in precision timing and wireless communication systems operating from −55°C to +150°C.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 25 V, but for reliable long-term operation in VCXO circuits, Zetex specifies derated use at ≤15 V to maintain <1 nA leakage and avoid junction degradation over 10+ years of field life. Operation above 20 V requires transient suppression and thermal monitoring per Issue 11 datasheet Section 3.

Does ZV831BV2TA require special PCB layout considerations?

Yes - the cathode must connect to a low-inductance RF ground plane with ≥2 vias within 2 mm; the anode trace should be ≥0.15 mm wide and shielded from RF coupling; and the SOT23 pad layout must follow Zetex's recommended thermal relief pattern to prevent solder voiding and ensure 330 mW power dissipation capability.

How does temperature affect its capacitance tuning linearity?

Capacitance shifts 300–400 ppm/°C, causing measurable nonlinearity in wide-temperature TCXOs. For example, a 50°C ambient swing introduces ~2% C-value drift, requiring either dual-varactor compensation or digital calibration lookup tables to hold tuning error <±0.2 ppm across full range.

Is ZV831BV2TA RoHS compliant and lead-free?

Yes - Zetex confirmed full RoHS compliance (Pb-free terminations, no Cd/Hg/PBB/PBDE) in Issue 11 (January 2007), and the SOT23 package uses matte tin plating compatible with standard SnAgCu reflow profiles; no exemption codes apply.