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Diodes Incorporated ZC830BTC
- Part No.:
- ZC830BTC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZC830BTC.pdf
- Description:
- DIODE VAR CAPACITANCE SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,941
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Product details
Overview
ZC830BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 10.0 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 ZC830BTC datasheet, ZC830BTC pinout, ZC830BTC application, or ZC830BTC equivalent, key selection criteria include its hyperabrupt CV slope for steep tuning response, SOT23 package compatibility with high-density RF layouts, 25 V reverse breakdown rating, and verified performance across −55°C to +150°C operating range.
Technical Context
The ZC830BTC employs a hyperabrupt junction profile to achieve a steep, linearized C–V curve-critical for minimizing tuning nonlinearity in voltage-controlled crystal oscillators. Its capacitance varies from ~11.0 pF at 2 V to ~2.0 pF at 20 V, supporting wide-range frequency pulling with predictable slope.
Designed for RF signal path tuning, it operates with minimal loss due to high Q (>300 @ 50 MHz) and negligible series resistance. The device's temperature coefficient of capacitance (300–400 ppm/°C) is tightly controlled to limit thermal drift in stable oscillator loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 9.0–11.0 pF - sets baseline resonant frequency in LC/VCO tank circuits |
| Capacitance Ratio C₂/C₂₀ | 4.5–6.0 - determines maximum achievable frequency tuning range |
| Q Factor @ 50 MHz | ≥300 - ensures low insertion loss and high selectivity in filter/oscillator tanks |
| Reverse Leakage @ 20 V | 0.2–20 nA - guarantees sub-milliradian phase noise contribution in oscillator bias networks |
| Reverse Breakdown Voltage | 25 V - supports robust tuning voltage headroom in 3.3 V/5 V/12 V control systems |
| Tempco of Capacitance | 300–400 ppm/°C - enables predictable drift compensation in TCXO reference paths |
Pinout & Package
Supplied in SOT23 surface-mount package (JEDEC TO-236AB), with cathode-marked anode-cathode configuration. Standard pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Cathode (common-cathode dual variant not applicable to ZC830BTC; this is a single-diode variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | AC-coupled tuning node | Connected to RF ground via DC-blocking capacitor; accepts tuning voltage through high-impedance bias network |
| Pin 2 (Cathode) | DC reference / RF return | Direct connection to oscillator tank ground or filter common node; carries no DC current in normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables linearized frequency vs. voltage response in VCXOs-reducing need for digital calibration |
| Tight CV tolerance (±5% at 2 V) | Minimizes unit-to-unit variation in production oscillator center frequency |
| Low IR (200 pA typical) | Prevents bias network loading and preserves phase noise floor below −160 dBc/Hz @ 10 kHz offset |
| High Q (>300 @ 50 MHz) | Reduces tank circuit losses-directly improving oscillator short-term stability and filter shape factor |
Applications
| VCXO Frequency Tuning | RF Bandpass Filter Tuning |
|---|---|
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 feedback loop, adjusting resonant frequency under DAC-controlled bias. Use Value: Enables ±50 ppm pullability with <0.5 ppm linearity error over 0–3 V tuning range-meeting GR-1244-CORE jitter compliance. | Use Scenario: Adaptive channel selection in 800–960 MHz LTE front-end duplexers. IC Role / Device Role / Timing Role: Tuning element in switched-capacitor bank of ceramic bandpass filter, dynamically shifting passband center. Use Value: Achieves 15 MHz bandwidth reconfiguration in <10 µs without mechanical actuators-supporting TDD/FDD mode switching. |
| Mobile Radio Transceiver LO | TCXO Temperature Compensation |
Use Scenario: Local oscillator tuning in handheld two-way radios operating at 136–174 MHz. IC Role / Device Role / Timing Role: Varactor in VCO core, modulated by FM baseband signal and coarse frequency synthesizer. Use Value: Delivers >80 dBc spurious suppression and <−110 dBc/Hz phase noise at 20 kHz offset-meeting ETSI EN 300 113 spectral mask. | Use Scenario: Secondary capacitance adjustment in oven-controlled oscillator temperature compensation network. IC Role / Device Role / Timing Role: Fine-tuning capacitor in analog temperature-sensing bridge, counteracting crystal aging drift. Use Value: Provides 0.1 ppm/°C resolution over −30°C to +75°C-extending holdover stability to ±0.1 ppm for 24 hours. |
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 | Higher C₂/C₂₀ (7.5), lower Q (200 @ 50 MHz), SOD-323 package | Better tuning range but higher phase noise impact in oscillator cores | Preferred when wider pullability outweighs Q penalty in low-cost consumer radios |
| BBY52-02W | Lower capacitance (5.6 pF @ 2 V), tighter tempco (±100 ppm/°C), same SOT23 | Reduced tuning range but superior thermal stability in unheated TCXOs | Selected for industrial-grade timing where temperature-induced drift dominates aging effects |
Compared with SMV1232-011LF and BBY52-02W, ZC830BTC balances tuning ratio, Q, and leakage to deliver optimal phase noise in mid-tier VCXOs-making it preferred for telecom infrastructure where both stability and adjustability are critical.
Availability
ZC830BTC is available at Aetrix Electronics and suitable for VCXO design, RF filter tuning, and mobile radio transceiver development requiring stable component supply, consistent CV matching, and RoHS-compliant SMT assembly.
Supply support for ZC830BTC 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 ISO 9001/TS16949-certified designer of high-performance analog and RF semiconductors, specializing in precision discrete components.
The 830 series was engineered specifically for frequency control applications demanding high-Q, low-leakage varactors with repeatable hyperabrupt characteristics-targeting VCXO, TCXO, and RF front-end filter markets.
FAQ
What is the maximum recommended reverse voltage for continuous operation?
The ZC830BTC has a rated reverse breakdown voltage of 25 V, but for reliable long-term operation, Zetex specifies a maximum continuous reverse voltage of 20 V. Exceeding this risks irreversible junction degradation and increased leakage, especially above 85°C ambient. Derating to 15 V is advised in thermally constrained PCB layouts.
Does ZC830BTC require special ESD handling during assembly?
Yes-ZC830BTC is classified as a Class 1B ESD-sensitive device (HBM <500 V). Handling requires grounded workstations, ionized air, and static-dissipative packaging. PCB layout must avoid floating traces near the SOT23 pads, and reflow profiles must stay within JEDEC J-STD-020 limits to prevent thermal stress-induced parameter shift.
Can ZC830BTC be used in dual-common-cathode configurations?
No-ZC830BTC is a single-diode variant in SOT23. Dual-common-cathode versions (e.g., ZMDC830) exist in the same family but use different marking and ordering codes. Substituting ZC830BTC into a dual-diode footprint will result in open-circuit behavior on one path and incorrect biasing.
How does its capacitance change between 25°C and 85°C?
At 3 V bias, ZC830BTC exhibits a capacitance shift of approximately −0.12% per °C, corresponding to −1.2 pF total change from 25°C to 85°C. This aligns with its specified tempco of 300–400 ppm/°C and is fully characterized in Zetex's Issue 11 datasheet Figure 5 (CV vs. temperature curves).
ZC830BTC 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
ZC830BTC FAQ
1.How can I place an order for ZC830BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZC830BTC 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 ZC830BTC reliable?
The price and inventory of ZC830BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZC830BTC is usually 5 days.
3.What payment methods are accepted for ZC830BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZC830BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZC830BTC?
ZC830BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZC830BTC 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 ZC830BTC?
For technical support, including ZC830BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZC830BTC requirements.
6.How does Aetrix verify that ZC830BTC is sourced from the original manufacturer or authorized distributors?
All ZC830BTC 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 ZC830BTC meets industry standards.
7.What is the process for return or replacement of ZC830BTC?
All ZC830BTC units undergo pre-shipment inspection (PSI). If there is an issue with ZC830BTC, 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 ZC830BTC part is unused and in its original packaging.
Return procedure for ZC830BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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