Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated ZMV933TC

Name: ZMV933TC
Brand: Diodes Incorporated
SKU: ZMV933TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZMV933TC

Manufacturer:: Diodes Incorporated

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-76, SOD-323

Datasheet:: ZMV933TC.pdf

Description:: DIODE VARACTOR 12V SOD323

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,637

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ZMV933TC 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 42.0 pF capacitance at 1 V, 27.0 pF at 4 V, minimum Q of 150 at 50 MHz, reverse leakage ≤100 nA at 8 V, and operates up to 12 V reverse bias - enabling octave-range frequency tuning in compact wireless timing modules.

For engineers reviewing the ZMV933TC datasheet, ZMV933TC pinout, ZMV933TC application, or ZMV933TC equivalent, this device is selected for low-phase-noise VCXO designs requiring high-CV linearity, tight capacitance tolerance, and miniature SOT23 packaging in mobile radio and pager RF subsystems.

Technical Context

This hyperabrupt junction varactor exhibits a steep, predictable C-V slope across 0–6 V tuning range, supporting octave-spanning frequency adjustment in oscillator tank circuits. Its 300–400 ppm/°C temperature coefficient of capacitance and <100 nA reverse leakage at 8 V directly contribute to stable phase noise performance in TCXO reference loops.

The device uses a single-diode configuration with common-cathode topology in SOT23 package, rated for 330 mW power dissipation at 25°C. Its 12 V breakdown voltage and controlled CV hysteresis ensure reliable operation under dynamic tuning conditions in battery-powered RF front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 1 V	42.0 pF - sets low-end oscillator frequency and tank impedance at minimum tuning voltage
Capacitance @ 4 V	27.0 pF - defines mid-range tuning point for octave-spanning VCO design
Min. Q @ 50 MHz	150 - limits insertion loss and phase noise degradation in resonant LC networks
Reverse Leakage @ 8 V	≤100 nA - ensures minimal tuning voltage drift and low close-in phase noise
Max. Reverse Voltage	12 V - establishes safe tuning voltage headroom for 0–6 V control range with margin
Temp. Coeff. of C	300–400 ppm/°C - quantifies capacitance drift over operating temperature in TCXO compensation

Pinout & Package

SOT23 surface-mount package: 3-pin, single-diode configuration with cathode common to Pin 2; anode on Pin 1, cathode on Pin 2, NC on Pin 3 (mechanical support only).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	DC tuning voltage injection point; connects to VCO control line via series resistor
Pin 2	Cathode	Common RF ground node for tank circuit; must be low-inductance connection to ground plane
Pin 3	No Connect	Mechanical tie-bar only; electrically isolated and must not be bonded or routed

Key Features

Feature	Design Value
Hyperabrupt junction profile	Enables linearized frequency vs. voltage response over 0–6 V, reducing VCO gain variation
Closely controlled C-V tolerance	±10% capacitance spread at 1 V and 4 V supports binning-free TCXO calibration
Low IR (≤100 nA @ 8 V)	Minimizes DC current draw from tuning DAC and prevents voltage droop in battery-operated pagers
High Q ≥150 @ 50 MHz	Reduces resonator losses in 100–200 MHz VCO tanks, improving phase noise by >3 dB

Applications

VCXO Frequency Tuning

TCXO Temperature Compensation

Use Scenario: Voltage-controlled crystal oscillator module in GPS timing receivers requiring ±2.5 ppm stability over –30°C to +85°C.

IC Role / Device Role / Timing Role: Varactor diode providing fine-frequency pullability (±50 ppm) via analog tuning voltage applied to crystal load capacitance.

Use Value: 42.0 → 27.0 pF C-V swing enables precise digital-to-analog frequency correction without external trim caps.

Use Scenario: Temperature-compensated oscillator in industrial telemetry transmitters where ambient drift exceeds ±10 ppm.

IC Role / Device Role / Timing Role: Active capacitance element in analog compensation network, adjusted by thermistor-derived voltage to counteract crystal C0 drift.

Use Value: 300–400 ppm/°C tempco matches typical AT-cut crystal drift, enabling first-order compensation within ±0.5 ppm error.

Pager RF Front-End

Mobile Radio Synthesizer

Use Scenario: Miniature two-way paging receiver operating at 450 MHz with 20 kHz channel spacing and <–120 dBc/Hz phase noise target.

IC Role / Device Role / Timing Role: Tuning element in Colpitts VCO core, directly modulated by baseband data for FSK transmission.

Use Value: ≤100 nA leakage prevents tuning voltage sag during burst transmission, maintaining channel accuracy over 100 ms duty cycles.

Use Scenario: UHF land-mobile radio synthesizer requiring fast lock time (<5 ms) and wideband coverage (400–470 MHz).

IC Role / Device Role / Timing Role: Primary varactor in switched-capacitor VCO bank, selected via RF MEMS switch to extend tuning range.

Use Value: 150 minimum Q at 50 MHz scales predictably to >90 Q at 450 MHz, ensuring <–110 dBc/Hz integrated phase noise.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMV1232-011	Higher C_1V = 56 pF; Q = 180 @ 50 MHz; SOD-323 package	Better Q but larger footprint; requires PCB redesign for pad layout	Select when higher tuning range or lower phase noise is prioritized over board space
BBY58-02W	C_1V = 22 pF; Q = 120 @ 50 MHz; SOT-23 package; 25 V rating	Lower capacitance and Q; wider voltage margin but reduced tuning span	Select when system requires >12 V tuning headroom and can accept narrower frequency pullability

Compared with ZMV933TC, SMV1232-011 offers superior Q and higher C for extended VCO range but demands SOD-323 layout changes, while BBY58-02W trades capacitance and Q for higher voltage tolerance - making ZMV933TC optimal for space-constrained, low-phase-noise 0–6 V TCXO tuning.

Availability

ZMV933TC is available at Aetrix Electronics and suitable for VCXO modules, TCXO reference oscillators, pager RF front-ends, and mobile radio synthesizers requiring stable component supply with consistent CV matching and low-leakage performance.

Supply support for ZMV933TC 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 (now part of Diodes Incorporated) is a UK-based designer of high-performance analog and RF semiconductors, specializing in precision discrete devices for timing, signal integrity, and power management.

The ZC930/ZMV930/ZV931 series was engineered specifically for low-phase-noise frequency control in portable wireless infrastructure, targeting pager, mobile radio, and TCXO markets with hyperabrupt varactors in miniature packages.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum reverse voltage is 12 V, but continuous operation should be limited to ≤8 V per the leakage specification (≤100 nA at 8 V). Exceeding 8 V increases leakage exponentially and degrades phase noise; 6 V is the practical upper limit for stable CV linearity in TCXO applications.

Is ZMV933TC pin-compatible with other devices in the ZMV930 series?

Yes - all ZMV930-series varactors (ZMV930TA through ZMV934ATA) share identical SOT23 pinout: Pin 1 = anode, Pin 2 = cathode, Pin 3 = NC. Capacitance values differ across the series, but PCB layout and soldering process are fully interchangeable.

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

This coefficient quantifies how much capacitance changes per degree Celsius at 3 V bias. In TCXO compensation networks, it's matched against the crystal's own temperature-induced C0 drift to cancel frequency error - requiring no additional active components when paired with a thermistor-based voltage divider.

Can ZMV933TC be used in RF switching applications?

No - it is not rated for forward conduction or RF power handling. With only 100 mA absolute maximum forward current and no specified RF switching parameters (e.g., isolation, insertion loss), its use is strictly limited to reverse-biased varactor tuning in oscillator and filter circuits.

ZMV933TC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 12pF @ 4V, 50MHz

Capacitance Ratio:: -

Capacitance Ratio Condition:: -

Voltage - Peak Reverse (Max):: 12 V

Diode Type:: Single

Q @ Vr, F:: 150 @ 4V, 50MHz

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

ZMV933TC FAQ

1.How can I place an order for ZMV933TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMV933TC 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 ZMV933TC reliable?

The price and inventory of ZMV933TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV933TC is usually 5 days.

3.What payment methods are accepted for ZMV933TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV933TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMV933TC?

ZMV933TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMV933TC 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 ZMV933TC?

For technical support, including ZMV933TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV933TC requirements.

6.How does Aetrix verify that ZMV933TC is sourced from the original manufacturer or authorized distributors?

All ZMV933TC 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 ZMV933TC meets industry standards.

7.What is the process for return or replacement of ZMV933TC?

All ZMV933TC units undergo pre-shipment inspection (PSI). If there is an issue with ZMV933TC, 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 ZMV933TC part is unused and in its original packaging.

Return procedure for ZMV933TC:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…