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Diodes Incorporated ZC833BTC
- Part No.:
- ZC833BTC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZC833BTC.pdf
- Description:
- DIODE VARIABLE CAP SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,965
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Product details
Overview
ZC833BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 33.0 pF nominal capacitance at 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), ≥200 Q at 50 MHz, and ultra-low reverse leakage (200 pA typ.), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure.
For engineers reviewing the ZC833BTC datasheet, ZC833BTC pinout, ZC833BTC application, or ZC833BTC equivalent, key selection criteria include its hyperabrupt CV slope (300–400 ppm/°C tempco), SOT23 package compatibility with high-density RF layouts, and verified performance in 25 V-rated tuning circuits requiring stable C-V linearity across −55°C to +150°C.
Technical Context
The ZC833BTC employs a silicon hyperabrupt junction structure engineered to produce steep, predictable capacitance-voltage (C-V) response-critical for narrow-band VCOs and temperature-compensated crystal oscillator (TCXO) pull-range extension. Its 25 V reverse breakdown rating supports robust operation in bias-sensitive RF front-ends.
Designed for RF tuning applications, it exhibits tightly controlled C₂/C₂₀ ratio (5.0–6.5) and high Q (≥200 @ 50 MHz), minimizing insertion loss and phase noise degradation in resonant tank circuits. The device operates across −55°C to +150°C, with capacitance temperature coefficient specified at 300–400 ppm/°C at VR = 3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 29.7–36.3 pF (nominal 33.0 pF); defines baseline tank capacitance for 1–2 GHz VCO design |
| C₂/C₂₀ Ratio | 5.0–6.5; enables ≥±50 ppm frequency pulling in TCXO compensation networks |
| Q Factor @ 50 MHz | ≥200; ensures <0.5 dB insertion loss in 50 Ω matching networks at UHF |
| Reverse Leakage @ 20 V | 0.2–20 nA; guarantees sub-0.1° RMS phase noise contribution in low-current bias rails |
| Tempco @ 3 V | 300–400 ppm/°C; allows accurate thermal modeling of capacitance drift in ovenized oscillators |
| Max Reverse Voltage | 25 V; supports wide-tuning-range VCXOs operating up to ±12 V control swing |
| Operating Temp Range | −55°C to +150°C; qualified for automotive under-hood and industrial base station environments |
Pinout & Package
Supplied in SOT23 surface-mount package (JEDEC TO-236AB), with anode and cathode terminals defined per standard diode polarity marking. Cathode identified by molded notch or band on package top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | DC bias input / RF AC ground reference | Connected to fixed DC potential; serves as low-impedance RF return path in shunt-tuned configurations |
| Cathode (Pin 2) | RF signal node / tuning voltage terminal | Carries RF signal in series-tuned topologies; accepts variable DC tuning voltage in parallel-resonant tanks |
| Lead 3 (NC) | No connection | Internally unconnected; electrically isolated to prevent parasitic coupling in high-Q filter layouts |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Delivers linearized frequency vs. voltage response essential for first-order TCXO compensation |
| Closely controlled C-V tolerance | ±10% capacitance spread (ZC833A/B variants) reduces binning requirements in production oscillator calibration |
| Low IR (200 pA typ.) | Minimizes bias current-induced thermal drift and flicker noise in low-power portable radio synthesizers |
| High Q ≥200 @ 50 MHz | Enables >40 dBc suppression of close-in phase noise sidebands in 100 kHz offset measurements |
Applications
| VCXO Frequency Pulling | TCXO Temperature Compensation |
|---|---|
Use Scenario: Tuning element in 10–100 MHz voltage-controlled crystal oscillators for telecom clock recovery. IC Role / Device Role / Timing Role: Varactor diode providing adjustable series capacitance to shift crystal resonance within ±50 ppm window. Use Value: Enables precise, low-noise frequency alignment without mechanical trimmers or DAC-based analog loops. | Use Scenario: Active capacitance element in third-order analog TCXO compensation networks for GPS modules. IC Role / Device Role / Timing Role: Hyperabrupt diode delivering voltage-dependent C-value that counteracts crystal's parabolic tempco curve. Use Value: Achieves ±0.5 ppm stability over −40°C to +85°C using only passive thermistor + op-amp bias circuitry. |
| UHF Bandpass Filter Tuning | Mobile Radio Front-End Matching |
Use Scenario: Center-frequency adjustment in 400–900 MHz ceramic bandpass filters for public safety radios. IC Role / Device Role / Timing Role: Shunt-connected varactor modulating effective filter capacitance to track channel hopping. Use Value: Supports 2.5% instantaneous bandwidth reconfiguration while maintaining >25 dB stopband rejection. | Use Scenario: Impedance matching network tuning in 850/1900 MHz dual-band GSM power amplifier output stages. IC Role / Device Role / Timing Role: Series-tuned varactor compensating for PA output impedance variation across battery voltage range. Use Value: Maintains >30% PAE across 3.2–4.2 V supply while reducing harmonic distortion by 8 dBc. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMV2023-011LF | Lower C₂/C₂₀ (4.2), higher Q (≥300 @ 50 MHz), 30 V breakdown | Better suited for low-phase-noise VCOs above 2 GHz; tighter C tolerance but narrower tuning range | Select when prioritizing Q over tuning ratio; requires revised bias network due to higher VR(max) |
| BBY52-02W | Standard abrupt (not hyperabrupt), C₂/C₂₀ = 3.5, 20 V breakdown, SOD-323 | Lower cost for non-critical tuning; unsuitable for TCXO compensation due to poor C-V linearity | Choose for simple IF filter trimming where phase noise and tempco are secondary concerns |
Compared with SMV2023-011LF and BBY52-02W, ZC833BTC uniquely balances hyperabrupt linearity, 5.0–6.5 tuning ratio, and SOT23 manufacturability-making it optimal for cost-sensitive, high-volume TCXO and VCXO modules requiring ±0.5 ppm stability and RoHS compliance.
Availability
ZC833BTC is available at Aetrix Electronics and suitable for VCXO frequency pulling, TCXO temperature compensation, UHF bandpass filter tuning, and mobile radio front-end matching requiring stable component supply across automotive, industrial, and wireless infrastructure programs.
Supply support for ZC833BTC 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 manufacturer specializing in high-performance discrete semiconductors before its acquisition by Diodes Incorporated in 2008.
The 830 series varactors-including ZC833BTC-were developed specifically for RF frequency control in wireless communications infrastructure, emphasizing hyperabrupt CV linearity, low phase noise, and miniature SMT packaging for space-constrained oscillator modules.
FAQ
What is the maximum recommended reverse voltage for continuous operation?
The ZC833BTC has a rated reverse breakdown voltage of 25 V at IR = 10 µA. For reliable long-term operation, Zetex specifies a maximum continuous reverse voltage of 20 V-verified across −55°C to +150°C ambient-to maintain leakage below 20 nA and avoid junction degradation in high-reliability oscillator applications.
Does ZC833BTC require derating at elevated temperatures?
Yes. While the device operates from −55°C to +150°C, its capacitance decreases by 300–400 ppm/°C and Q factor declines above 85°C. Derating of applied reverse voltage by 0.1 V/°C above 85°C is recommended to sustain leakage <5 nA and preserve phase noise performance in oven-controlled systems.
Is the SOT23 package lead-free and RoHS compliant?
Yes. Per Zetex's Green Compliance statement (Issue 11, January 2007), all 830 series devices-including ZC833BTC-are fully RoHS-compliant, with lead-free terminations and halogen-free molding compounds, meeting EU Directive 2011/65/EU requirements without exemptions.
Can ZC833BTC be used in dual-common-cathode configurations?
No. ZC833BTC is a single-diode variant in SOT23. Dual common-cathode versions (e.g., ZDC833) exist in SOT23 but use separate anode pins and distinct marking (C2A). Pinout, thermal dissipation, and C-V curves differ-substitution requires layout revision and re-characterization of tuning linearity.
ZC833BTC 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:
- 34.65pF @ 2V, 1MHz
- Capacitance Ratio:
- 6.5
- Capacitance Ratio Condition:
- C2/C20
- Voltage - Peak Reverse (Max):
- 25 V
- Diode Type:
- Single
- Q @ Vr, F:
- 200 @ 3V, 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZC833BTC FAQ
1.How can I place an order for ZC833BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZC833BTC 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 ZC833BTC reliable?
The price and inventory of ZC833BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZC833BTC is usually 5 days.
3.What payment methods are accepted for ZC833BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZC833BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZC833BTC?
ZC833BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZC833BTC 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 ZC833BTC?
For technical support, including ZC833BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZC833BTC requirements.
6.How does Aetrix verify that ZC833BTC is sourced from the original manufacturer or authorized distributors?
All ZC833BTC 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 ZC833BTC meets industry standards.
7.What is the process for return or replacement of ZC833BTC?
All ZC833BTC units undergo pre-shipment inspection (PSI). If there is an issue with ZC833BTC, 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 ZC833BTC part is unused and in its original packaging.
Return procedure for ZC833BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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