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Diodes Incorporated ZC831BTC
- Part No.:
- ZC831BTC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZC831BTC.pdf
- Description:
- DIODE VARIABLE CAP SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,571
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Product details
Overview
ZC831BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 15.0 pF nominal capacitance at 2 V, 4.5–6.0 capacitance ratio (C₂/C₂₀), ≥300 Q at 50 MHz, and ultra-low reverse leakage (200 pA typ.), enabling low-phase-noise VCXO/TCXO designs in wireless infrastructure and mobile radio front-ends.
For engineers reviewing the ZC831BTC datasheet, ZC831BTC pinout, ZC831BTC application, or ZC831BTC equivalent, key selection criteria include its hyperabrupt CV slope for steep tuning response, SOT23 package compatibility with high-density RF layouts, guaranteed C₂/C₂₀ ≥4.5, and operation up to +150°C ambient.
Technical Context
The ZC831BTC employs a hyperabrupt junction profile to achieve a nonlinear capacitance-voltage (CV) characteristic ideal for wide-range, high-sensitivity frequency control. Its doping gradient yields a steeper dC/dV slope than abrupt or linear diodes, directly supporting fine-resolution tuning in voltage-controlled crystal oscillators.
Designed for RF signal path integration, it maintains Q ≥300 at 50 MHz under 3 V bias and exhibits <20 nA reverse leakage at 20 V, minimizing phase noise contribution in oscillator tank circuits and ensuring stable resonance tracking across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 13.5–16.5 pF (tight tolerance enables predictable oscillator center frequency) |
| Capacitance Ratio C₂/C₂₀ | Min. 4.5 (supports ≥2-octave tuning range in VCOs) |
| Q Factor @ 50 MHz | ≥300 (minimizes resonator loss and phase noise in crystal tanks) |
| Reverse Leakage @ 20 V | 0.2–20 nA (ensures low DC current injection into sensitive oscillator nodes) |
| Max Reverse Voltage | 25 V (allows safe operation with common ±12 V or 3.3–5 V tuning rails) |
| Temp Coefficient of C | 300–400 ppm/°C (predictable drift behavior for TCXO compensation algorithms) |
Pinout & Package
Supplied in SOT23 surface-mount package (JEDEC TO-236AB), 3-pin configuration with anode, cathode, and case (cathode-connected substrate). Dimensions: 2.67–3.05 mm × 1.20–1.40 mm × 0.95 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | DC tuning voltage input node | Bias point for reverse-biased junction; connects to tuning potentiometer or DAC output |
| Cathode (Pin 2) | RF ground reference | Common connection to oscillator tank ground plane; lowest inductance return path |
| Case / Pin 3 | Thermal & electrical ground | Internally tied to cathode; provides mechanical stability and thermal dissipation path |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables >4.5× capacitance tuning range with linearized V–f response in VCXOs |
| Controlled CV tolerance (±10% at 2 V) | Reduces binning requirements and simplifies oscillator calibration across production lots |
| Low IR (200 pA typical) | Prevents DC loading of high-impedance tuning networks and preserves loop stability |
| High Q ≥300 @ 50 MHz | Directly improves phase noise floor by reducing tank circuit resistive losses |
Applications
| VCXO Frequency Tuning | TCXO Temperature Compensation |
|---|---|
Use Scenario: Fine-tuning of 10–100 MHz crystal oscillator output in telecom base station timing modules. IC Role / Device Role / Timing Role: Voltage-variable capacitor in Pierce oscillator tank, adjusting resonant frequency via analog tuning voltage. Use Value: Achieves ±50 ppm tuning range with <−150 dBc/Hz phase noise at 10 kHz offset due to high Q and low IR. | Use Scenario: Compensating crystal frequency drift over −40°C to +85°C in GPS receiver reference clocks. IC Role / Device Role / Timing Role: Varactor element in analog temperature-compensation network, paired with thermistor and op-amp. Use Value: Predictable 300–400 ppm/°C capacitance drift enables accurate polynomial compensation without digital lookup tables. |
| Mobile Radio Front-End Filtering | Wireless IF Tuning |
Use Scenario: Reconfigurable bandpass filter in 800/900 MHz PHS and TETRA handheld radios. IC Role / Device Role / Timing Role: Tuning element in switched-capacitor LC filter bank, enabling channel-select filtering on-the-fly. Use Value: Hyperabrupt CV slope allows 12 dB rejection shift per 0.5 V tuning step, supporting fast channel switching. | Use Scenario: Local oscillator frequency alignment in 2.4 GHz Bluetooth transceivers during packet synchronization. IC Role / Device Role / Timing Role: Fine-tuning capacitor in fractional-N PLL loop filter, correcting VCO gain mismatch. Use Value: Tight 13.5–16.5 pF tolerance reduces post-calibration frequency error to <±2 kHz at 2.45 GHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAVR-000120-1411 | Lower C₂/C₂₀ (3.8 min), higher Q (≥400), SOD-323 package | Better suited for narrow-range, ultra-low-noise VCOs where size > tuning range priority | Select when board space is constrained and tuning range ≤1.8× required |
| SMV1232-011 | Higher capacitance (22 pF nom), lower Q (≥200), SOT-23 same footprint | Optimized for UHF TV tuners requiring wider absolute capacitance swing | Select when >18 pF baseline capacitance needed for lower-frequency oscillator designs |
Compared with MAVR-000120-1411 and SMV1232-011, ZC831BTC uniquely balances 4.5× tuning ratio, 300+ Q, and 15 pF baseline in SOT23-making it optimal for mid-band VCXOs where both range and phase noise matter.
Availability
ZC831BTC is available at Aetrix Electronics and suitable for VCXO design, TCXO compensation, and RF front-end filtering requiring stable component supply, tight CV matching, and high-temperature reliability up to +150°C.
Supply support for ZC831BTC 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 analog and RF discrete semiconductors before its acquisition by Diodes Incorporated in 2008.
The 830 series varactors were engineered specifically for frequency-agile wireless infrastructure and precision timing systems, emphasizing hyperabrupt CV linearity, low leakage, and high-Q RF performance in miniature packages.
FAQ
What is the maximum reverse voltage rating for ZC831BTC?
The absolute maximum reverse voltage is 25 V, specified at IR = 10 µA. Operation above this risks junction breakdown and irreversible capacitance shift. For reliable long-term use in VCXOs, derate to ≤15 V reverse bias to maintain CV stability and minimize aging effects.
Does ZC831BTC require special PCB layout considerations?
Yes: keep the cathode (Pin 2) trace short and wide to minimize inductance in the RF ground path; avoid vias under the SOT23 pad; use thermal relief on the case (Pin 3) only if soldering requires it-otherwise solid copper pour improves thermal dissipation and RF grounding.
How does temperature affect ZC831BTC's capacitance value?
Capacitance changes at 300–400 ppm/°C over −55°C to +150°C. At 85°C, nominal 15.0 pF drops ~4.5 pF relative to 25°C-this predictable drift is leveraged in analog TCXO compensation networks using thermistor-derived bias voltages.
Is ZC831BTC RoHS compliant?
Yes. As confirmed in Zetex's January 2007 datasheet Issue 11, all 830 series devices-including ZC831BTC-are fully compliant with the EU RoHS Directive (2002/95/EC), containing no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
ZC831BTC 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:
- 15.75pF @ 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
ZC831BTC FAQ
1.How can I place an order for ZC831BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZC831BTC 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 ZC831BTC reliable?
The price and inventory of ZC831BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZC831BTC is usually 5 days.
3.What payment methods are accepted for ZC831BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZC831BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZC831BTC?
ZC831BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZC831BTC 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 ZC831BTC?
For technical support, including ZC831BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZC831BTC requirements.
6.How does Aetrix verify that ZC831BTC is sourced from the original manufacturer or authorized distributors?
All ZC831BTC 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 ZC831BTC meets industry standards.
7.What is the process for return or replacement of ZC831BTC?
All ZC831BTC units undergo pre-shipment inspection (PSI). If there is an issue with ZC831BTC, 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 ZC831BTC part is unused and in its original packaging.
Return procedure for ZC831BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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