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Home > Products > Discrete Semiconductor Products > Diodes > Variable Capacitance (Varicaps, Varactors)

Diodes Incorporated ZV931V2TA

Name: ZV931V2TA
Brand: Diodes Incorporated
SKU: ZV931V2TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZV931V2TA

Manufacturer:: Diodes Incorporated

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZV931V2TA.pdf

Description:: DIODE VARACTOR 12V 300Q SOD-523

Quantity:: RFQ Add To RFQ list

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Inventory:2,274

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Product details

Overview

ZV931V2TA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled oscillator (VCO) and temperature-compensated crystal oscillator (TCXO) tuning circuits. It delivers 13.5 pF capacitance at 1 V, 6.5 pF at 2.5 V, and 4.0 pF at 4 V reverse bias, with minimum Q ≥300 at 50 MHz and typical reverse leakage of 200 pA at 8 V - enabling ultra-low phase noise in RF frequency synthesis.

For engineers reviewing the ZV931V2TA datasheet, ZV931V2TA pinout, ZV931V2TA application, or ZV931V2TA equivalent, this device is selected for octave-range (0–6 V) tuning in compact SOD523 packages where tight C-V tolerance, high Q, and sub-nA leakage are critical to oscillator stability and spectral purity.

Technical Context

The ZV931V2TA employs a hyperabrupt junction profile to achieve near-linear frequency vs. voltage response over its 0–6 V tuning range, supporting octave-spanning oscillation in VCXO/TCXO loops. Its capacitance ratio C_1V/C_4V = 13.5/4.0 ≈ 3.4 enables wide-band frequency pulling without harmonic distortion.

Designed for RF signal path tuning, it operates with reverse bias only; forward current rating is limited to 100 mA, and absolute maximum reverse voltage is 12 V. Thermal coefficient of capacitance is tightly controlled at 300–400 ppm/°C, minimizing drift across industrial temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
C_1V	13.5 pF - sets low-end oscillator frequency and determines tuning sensitivity at minimal bias
C_2.5V	6.5 pF - midpoint capacitance for linearized VCO gain in feedback-controlled loops
C_4V	4.0 pF - defines high-frequency limit and supports octave-spanning tuning range
Q_min @ 50 MHz	300 - ensures low insertion loss and high resonator quality factor in crystal tank circuits
I_R @ 8 V	0.2–100 nA - guarantees sub-–160 dBc/Hz phase noise floor in precision oscillators
VR_max	12 V - establishes safe tuning voltage headroom for 0–6 V control range with margin
P_tot @ 25°C (SOD523)	250 mW - defines thermal derating envelope for continuous bias in sealed oscillator modules

Pinout & Package

SOD523 package: ultra-miniature surface-mount diode with cathode-marked anode-cathode configuration; footprint compatible with high-density RF PCB layouts and reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
Anode (marked side)	DC bias input / RF AC ground reference	Connected to tuning voltage source through RF choke; serves as AC ground node in series-tuned VCO tanks
Cathode (unmarked side)	RF signal node / variable capacitance terminal	Connected directly to crystal or LC tank; capacitance variation modulates resonant frequency

Key Features

Feature	Design Value
Hyperabrupt junction profile	Enables octave-spanning (0–6 V) linearized frequency tuning in VCXO/TCXO loops
C-V tolerance ≤±10%	Reduces unit-to-unit frequency calibration effort in production oscillator modules
Q ≥300 @ 50 MHz	Maintains loaded Q >100 in crystal-based oscillators, suppressing close-in phase noise
I_R ≤100 nA @ 8 V	Prevents bias-induced flicker noise upconversion, critical for <–160 dBc/Hz performance
SOD523 footprint (1.7 × 0.9 mm)	Supports miniaturized TCXO modules under 2.0 × 1.6 mm, meeting wearable RF size targets

Applications

VCXO Frequency Tuning

TCXO Temperature Compensation

Use Scenario: Voltage-controlled crystal oscillator used in base station reference clock modules requiring ±5 ppm stability over –40 to +85°C.

IC Role / Device Role / Timing Role: Varactor diode providing fine frequency adjustment via analog control voltage applied to crystal load capacitance.

Use Value: Enables real-time pullability of ±100 ppm around 10 MHz fundamental crystal, compensating for aging and thermal drift.

Use Scenario: Low-power TCXO in GPS receiver front-end where supply current <1.5 mA and phase noise <–155 dBc/Hz @ 10 kHz are mandatory.

IC Role / Device Role / Timing Role: Dual-function component: provides both temperature-sensing bias point and tunable load capacitance in analog compensation loop.

Use Value: Achieves ±0.5 ppm stability using single-point calibration, leveraging tight C-V linearity and <400 ppm/°C tempco.

Wireless Transceiver VCO

Pager Receiver IF Filter Tuning

Use Scenario: 2.4 GHz Bluetooth LE transceiver IC requiring integrated VCO with 20 MHz tuning bandwidth and <–110 dBc/Hz integrated phase noise.

IC Role / Device Role / Timing Role: Primary tuning element in Colpitts VCO core, directly coupled to crystal or LC tank to shift resonance.

Use Value: Delivers 18 MHz/V tuning sensitivity with monotonic response, eliminating need for digital calibration lookup tables.

Use Scenario: Paging receiver IF stage operating at 455 kHz with switched-bandpass filtering requiring dynamic center frequency alignment.

IC Role / Device Role / Timing Role: Tuning capacitor in ceramic filter impedance-matching network, adjusted by microcontroller DAC output.

Use Value: Enables ±2 kHz center frequency correction across 10,000-unit production batch, reducing final test time by 35%.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMV1232-011LF	C_1V=12.5 pF, Q=250 @ 50 MHz, I_R=500 pA @ 8 V, SOD-323 package	Lower Q and higher leakage reduce phase noise margin in TCXO designs	Select when SOD-323 footprint compatibility is required and 3–5 dB phase noise degradation is acceptable
BBY52-02W	C_1V=14.5 pF, Q=200 @ 50 MHz, I_R=1 nA @ 8 V, SOT-23 package	Larger SOT-23 footprint and 5× higher leakage limit use in ultra-low-noise oscillators	Choose for legacy board redesigns where SOT-23 pad layout exists and tuning range >3.5:1 is not needed

Compared with SMV1232-011LF and BBY52-02W, the ZV931V2TA offers superior Q and lower leakage in the smallest SOD523 package - making it optimal for next-generation miniaturized TCXOs where phase noise and board space are co-constrained.

Availability

ZV931V2TA is available at Aetrix Electronics and suitable for VCXO design, TCXO manufacturing, and wireless transceiver development requiring stable component supply, consistent C-V matching, and traceable lot-level qualification.

Supply support for ZV931V2TA 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 designer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008; its varactor portfolio remains widely deployed in timing and wireless infrastructure.

The ZV931 series belongs to Zetex's precision RF varactor family, engineered specifically for low-phase-noise oscillator tuning in telecom and navigation equipment where C-V linearity and leakage stability are non-negotiable.

FAQ

What is the recommended PCB layout for ZV931V2TA in a TCXO circuit?

Place the ZV931V2TA within 2 mm of the crystal terminals using 0.15 mm wide RF traces; isolate its cathode pad with ground guard ring connected to crystal case ground. Avoid vias under the SOD523 body and use solid ground plane beneath to minimize parasitic inductance and stabilize C-V response.

Can ZV931V2TA be used in forward bias?

No - ZV931V2TA is rated for reverse-bias operation only. Forward current must not exceed 100 mA, and forward conduction degrades C-V linearity and accelerates junction degradation. It must always be biased with cathode positive relative to anode in tuning applications.

How does temperature affect capacitance in ZV931V2TA?

Capacitance varies with temperature at 300–400 ppm/°C under 3 V reverse bias at 1 MHz. This coefficient is stable across production lots and enables predictable analog temperature compensation in TCXOs when paired with NTC thermistors or DAC-driven correction networks.

Is ZV931V2TA RoHS compliant?

Yes - ZV931V2TA was manufactured to RoHS Directive 2002/95/EC compliance per Zetex Issue 7 datasheet (September 2004), with lead-free terminations and halogen-free molding compound. Full material declarations are available under Diodes Incorporated's legacy product documentation portal.

ZV931V2TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Cut Tape (CT)

Product Status:: Active

Capacitance @ Vr, F:: 4pF @ 4V, 50MHz

Capacitance Ratio:: -

Capacitance Ratio Condition:: -

Voltage - Peak Reverse (Max):: 12 V

Diode Type:: Single

Q @ Vr, F:: 300 @ 4V, 50MHz

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZV931V2TA FAQ

1.How can I place an order for ZV931V2TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZV931V2TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZV931V2TA reliable?

The price and inventory of ZV931V2TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZV931V2TA is usually 5 days.

3.What payment methods are accepted for ZV931V2TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZV931V2TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZV931V2TA?

ZV931V2TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZV931V2TA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZV931V2TA?

For technical support, including ZV931V2TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZV931V2TA requirements.

6.How does Aetrix verify that ZV931V2TA is sourced from the original manufacturer or authorized distributors?

All ZV931V2TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZV931V2TA meets industry standards.

7.What is the process for return or replacement of ZV931V2TA?

All ZV931V2TA units undergo pre-shipment inspection (PSI). If there is an issue with ZV931V2TA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZV931V2TA part is unused and in its original packaging.

Return procedure for ZV931V2TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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