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

Diodes Incorporated ZC830BTA

Name: ZC830BTA
Brand: Diodes Incorporated
SKU: ZC830BTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZC830BTA

Manufacturer:: Diodes Incorporated

Category:: Variable Capacitance (Varicaps, Varactors)

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

Datasheet:: ZC830BTA.pdf

Description:: DIODE VAR CAP 10PF 25V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,622

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Product details

Overview

ZC830BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 9.5–10.5 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 designs in wireless infrastructure.

For engineers reviewing the ZC830BTA datasheet, ZC830BTA pinout, ZC830BTA application, or ZC830BTA 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 TCXO stability in mobile radio front-ends.

Technical Context

The ZC830BTA employs a hyperabrupt junction profile to achieve a steep, linearized voltage-to-capacitance transfer function-essential for minimizing tuning nonlinearity in voltage-controlled crystal oscillators. Its capacitance varies from ~10.5 pF at 2 V to ~2.5 pF at 20 V, supporting wide-range frequency pulling with predictable slope.

Designed for RF signal path tuning, it operates with ≤20 nA reverse leakage at 20 V and exhibits a temperature coefficient of capacitance of +300 to +400 ppm/°C, requiring compensation in high-stability TCXO topologies. The device is rated for 25 V reverse breakdown and 200 mA forward current, though used exclusively in reverse-biased mode.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance @ 2 V	9.5–10.5 pF - sets nominal oscillator load capacitance and determines center frequency in parallel-resonant VCXO circuits
Capacitance Ratio C₂/C₂₀	≥4.5 - enables ≥250 ppm frequency pull range in 10–30 MHz fundamental-mode crystals
Q Factor @ 3 V, 50 MHz	≥300 - minimizes phase noise contribution in oscillator loop, critical for <−150 dBc/Hz @ 10 kHz offset
Reverse Leakage @ 20 V	≤20 nA - ensures stable bias point and prevents drift-induced frequency instability over temperature
Breakdown Voltage	25 V - allows safe operation with ±12 V tuning rails and margin against transient overvoltage
Tempco of Capacitance	+300 to +400 ppm/°C - requires complementary NPO capacitor or active tempcomp in TCXO reference paths
Package	SOT23 - surface-mount compatible with automated placement; thermal resistance ~250°C/W junction-to-ambient

Pinout & Package

SOT23 package: 3-terminal plastic surface-mount case with cathode-marked lead (pin 3). Standard JEDEC MO-215 outline; body size 2.9 × 1.3 × 1.0 mm; recommended solder profile per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	DC tuning voltage input node	Connected to low-impedance voltage source (e.g., DAC output or op-amp buffer); reverse-biased during operation
Cathode (Pin 2)	RF signal path connection	Directly tied to crystal or filter resonator node; carries RF current while blocking DC bias
Cathode (Pin 3)	Common cathode terminal	Electrically identical to Pin 2; provides mechanical redundancy and improved thermal dissipation in SOT23 layout

Key Features

Feature	Design Value
Hyperabrupt junction profile	Enables linearized C–V slope across 2–20 V range, reducing harmonic distortion in tuning loops
Close-tolerance capacitance binning (B grade)	±5% C tolerance at 2 V ensures consistent pull range across production lots without individual calibration
High Q ≥300 @ 50 MHz	Directly limits phase noise floor in oscillator tank circuits; outperforms standard abrupt-junction varactors by >40%
Low IR ≤20 nA @ 20 V	Prevents bias shift under temperature cycling, maintaining long-term frequency stability in unregulated environments
Extended temperature range	Rated –55°C to +150°C operation supports deployment in automotive power amplifiers and base station RF modules

Applications

VCXO Frequency Tuning

TCXO Temperature Compensation

Use Scenario: Fine-tuning of 10–25 MHz fundamental-mode quartz crystals in telecom timing modules.

IC Role / Device Role / Timing Role: Voltage-variable reactance element in Pierce oscillator feedback path, modulating crystal effective load capacitance.

Use Value: Enables ±50 to ±200 ppm frequency adjustment with <0.1 ppm/V linearity error due to hyperabrupt CV slope.

Use Scenario: Analog temperature compensation network in oven-controlled oscillator reference stages.

IC Role / Device Role / Timing Role: Tuning element paired with NTC thermistor to counteract crystal frequency drift over –40°C to +85°C.

Use Value: Matches +350 ppm/°C crystal tempco with predictable, repeatable slope - eliminating need for digital calibration.

Wireless Transceiver Filtering

Mobile Radio Front-End Tuning

Use Scenario: Band-select tuning in 800–900 MHz IF SAW filter matching networks.

IC Role / Device Role / Timing Role: Adjustable shunt capacitance to align filter insertion loss peak with channel center frequency.

Use Value: Achieves <1.5 dB insertion loss variation across 10 MHz bandwidth using single-varactor tuning instead of switched capacitor banks.

Use Scenario: Antenna impedance matching in dual-band GSM/UMTS handset PA output stages.

IC Role / Device Role / Timing Role: Dynamic capacitance element in π-network tuner, adjusted via baseband processor DAC.

Use Value: Maintains PA efficiency >35% across 824–849 MHz and 869–894 MHz bands with <200 μs settling time.

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	Lower C₂/C₂₀ (3.8 min), higher Q (≥500), SOD-323 package	Better phase noise but narrower tuning range; requires tighter layout control due to smaller pad area	Preferred for ultra-low-noise OCXO references where tuning range <150 ppm suffices
BBY52-02W	Higher capacitance (12–13 pF @ 2 V), lower Q (≥200), SOD-523 package	Wider initial capacitance enables larger absolute pull range but degrades close-in phase noise	Selected when board space is constrained and tuning range >300 ppm is required at expense of noise floor

Compared with SMV1232-011LF and BBY52-02W, ZC830BTA offers the optimal balance of tuning linearity (hyperabrupt), moderate Q (≥300), and industry-standard SOT23 footprint - making it the default choice for cost-sensitive, high-volume VCXO designs requiring ±200 ppm pull with <−145 dBc/Hz phase noise.

Availability

ZC830BTA is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation, and RF front-end tuning requiring stable component supply, tight CV binning, and extended temperature reliability.

Supply support for ZC830BTA 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) was a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, with focus on RF, power management, and precision signal conditioning.

The 830 series varactors were developed specifically for frequency control in wireless infrastructure and portable communications equipment, emphasizing hyperabrupt CV linearity, low leakage, and high-Q performance in miniature SMT packages.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The ZC830BTA is rated for 25 V reverse breakdown voltage, but continuous operation above 20 V is not recommended due to accelerated aging and increased leakage drift. For reliable long-term VCXO use, maintain VR ≤18 V with ≥2 V safety margin - verified per Zetex Issue 11 test conditions at 25°C ambient.

Does ZC830BTA require derating at elevated temperatures?

Yes - reverse leakage increases exponentially above 85°C; at +125°C, IR rises to ~2 nA (still within spec), but capacitance tempco shifts to +450 ppm/°C. Derate max VR by 0.1 V/°C above 85°C ambient to ensure 10-year reliability in automotive under-hood applications.

Can ZC830BTA be used in series or parallel configurations?

Parallel connection of two ZC830BTA units doubles capacitance and halves tuning sensitivity - useful for extending C₂/C₂₀ range in wide-pull TCXOs. Series connection is not recommended: mismatched junctions cause nonlinear voltage division and unpredictable CV behavior, violating hyperabrupt slope integrity.

Is the SOT23 marking "J1B" sufficient for full traceability?

Yes - "J1B" is the official Zetex device marking for ZC830BTA per Issue 11 documentation, indicating 10.0 pF nominal capacitance (J1) and ±5% tolerance grade (B). Full traceability requires reel code (TA/TC), date code, and lot number from original packaging - all preserved in Aetrix's certified distribution chain.

ZC830BTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 10.5pF @ 2V, 1MHz

Capacitance Ratio:: 6.0

Capacitance Ratio Condition:: C2/C20

Voltage - Peak Reverse (Max):: 25 V

Diode Type:: Single

Q @ Vr, F:: 300 @ 3V, 50MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZC830BTA FAQ

1.How can I place an order for ZC830BTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZC830BTA 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 ZC830BTA reliable?

The price and inventory of ZC830BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZC830BTA is usually 5 days.

3.What payment methods are accepted for ZC830BTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZC830BTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZC830BTA?

ZC830BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZC830BTA 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 ZC830BTA?

For technical support, including ZC830BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZC830BTA requirements.

6.How does Aetrix verify that ZC830BTA is sourced from the original manufacturer or authorized distributors?

All ZC830BTA 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 ZC830BTA meets industry standards.

7.What is the process for return or replacement of ZC830BTA?

All ZC830BTA units undergo pre-shipment inspection (PSI). If there is an issue with ZC830BTA, 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 ZC830BTA part is unused and in its original packaging.

Return procedure for ZC830BTA:

1.Submit a request within 90 days.

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

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