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Diodes Incorporated ZMV835BTA
- Part No.:
- ZMV835BTA
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZMV835BTA.pdf
- Description:
- DIODE VARACTOR 25V SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,318
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Product details
Overview
ZMV835BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators. It delivers 64.6–71.4 pF capacitance at 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), and <20 nA reverse leakage at 20 V, enabling low-phase-noise VCXO designs in SOT23 surface-mount packages.
For engineers reviewing the ZMV835BTA datasheet, ZMV835BTA pinout, ZMV835BTA application, or ZMV835BTA equivalent, this part supports high-stability frequency control where steep CV slope, tight capacitance tolerance (±5%), and high Q (>100 at 50 MHz) are critical for RF filtering and oscillator loop calibration.
Technical Context
ZMV835BTA operates as a reverse-biased junction capacitor whose depletion width-and thus capacitance-varies nonlinearly with applied DC tuning voltage. Its hyperabrupt doping profile yields a steeper C–V slope than abrupt or linear diodes, improving tuning sensitivity in narrowband VCOs and TCXOs.
The device is characterized at 25°C with guaranteed C₂/C₂₀ ≥5.0, Q ≥100 at 50 MHz and 3 V bias, and temperature coefficient of capacitance between 300–400 ppm/°C-enabling predictable drift compensation in compensated crystal oscillator topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 64.6–71.4 pF - sets nominal oscillator tank impedance and center frequency in 1–2 GHz VCO designs |
| Capacitance Ratio C₂/C₂₀ | Min 5.0 - enables ≥2× frequency tuning range without compromising linearity or phase noise |
| Q Factor @ 50 MHz, 3 V | ≥100 - minimizes resonator loss, directly improving phase noise floor by up to 6 dB in VCXO loops |
| Reverse Leakage @ 20 V | ≤20 nA - ensures stable bias point and prevents thermal runaway in high-Q crystal networks |
| Tempco of Capacitance | 300–400 ppm/°C - allows accurate modeling of frequency drift over −40°C to +85°C operating range |
| Max Reverse Voltage | 25 V - defines safe tuning voltage headroom for ±12 V oscillator control rails |
| Package | SOT23 - 3-pin surface-mount footprint compatible with automated placement and reflow profiles per IPC-7095 |
Pinout & Package
SOT23 package: 3-terminal surface-mount outline with cathode-marked lead (Pin 3), anode (Pin 1), and common cathode connection (Pin 2) for dual-diode variants; ZMV835BTA is single-diode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | DC tuning voltage input node; must be AC-grounded via RF choke or capacitor for RF signal isolation |
| Pin 2 | Cathode | AC ground reference and RF return path; connects to oscillator tank ground plane with minimal inductance |
| Pin 3 | Cathode Mark | Physical orientation marker; electrically identical to Pin 2-no separate function |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Delivers >2× steeper dC/dV slope vs. standard abrupt varactors-reducing required tuning voltage swing by 40% |
| Tight capacitance tolerance (±5% at 2 V) | Eliminates post-assembly capacitor trimming in production VCXOs, reducing test time and BOM count |
| Low IR (200 pA typ., ≤20 nA max) | Maintains stable DC bias under temperature cycling-critical for long-term frequency stability in telecom base stations |
| High Q ≥100 @ 50 MHz | Directly lowers phase noise contribution in crystal oscillator phase-locked loops (PLLs) by limiting resonator loss |
Applications
| VCXO Frequency Calibration | TCXO Temperature Compensation |
|---|---|
Use Scenario: Fine-tuning of 10–100 MHz fundamental-mode quartz crystals in telecom timing modules. IC Role / Device Role / Timing Role: Voltage-variable capacitor in Colpitts oscillator feedback network, adjusting resonant frequency within ±50 ppm window. Use Value: Enables factory calibration and real-time drift correction using 0–3 V DAC output without external op-amp buffering. | Use Scenario: Secondary tuning element in analog temperature-compensated crystal oscillator (ATCXO) circuits. IC Role / Device Role / Timing Role: Varactor paired with thermistor network to counteract crystal's parabolic frequency vs. temperature curve. Use Value: Achieves <±0.5 ppm stability over −20°C to +70°C using passive compensation-no microcontroller required. |
| RF Front-End Filtering | Wireless Transceiver Local Oscillator |
Use Scenario: Tunable bandpass filter in 800–900 MHz ISM-band receiver front ends. IC Role / Device Role / Timing Role: Tuning capacitor in switched-capacitor LC filter bank, dynamically adjusting center frequency during channel hopping. Use Value: Supports 12 MHz bandwidth reconfiguration in <10 µs with <0.3 dB insertion loss variation across tuning range. | Use Scenario: Core tuning element in 2.4 GHz Bluetooth LE transceiver synthesizer VCO core. IC Role / Device Role / Timing Role: Hyperabrupt varactor in differential cross-coupled VCO topology, providing primary frequency control via PLL charge pump voltage. Use Value: Delivers −110 dBc/Hz phase noise at 1 MHz offset while supporting 20 MHz modulation bandwidth. |
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 = 56 pF, higher Q = 150 @ 50 MHz, tighter C₂/C₂₀ = 6.0 | Better phase noise but narrower tuning range; requires higher tuning voltage (0–28 V) | Select when Q-driven phase noise dominates over tuning range requirements |
| BBY52-02W | Higher C₂ = 75 pF, lower Q = 70 @ 50 MHz, C₂/C₂₀ = 4.2 | Wider absolute capacitance range but reduced linearity; suited for coarse tuning stages | Select when wider absolute C-range needed for multi-band VCO coverage |
Compared with SMV2023-011LF and BBY52-02W, ZMV835BTA offers balanced trade-off: sufficient C-range for ±50 ppm VCXO calibration, verified Q ≥100 for telecom-grade phase noise, and SOT23 compatibility with legacy oscillator PCB layouts.
Availability
ZMV835BTA is available at Aetrix Electronics and suitable for VCXO calibration, TCXO compensation, and RF front-end filtering requiring stable component supply, consistent parametric binning, and RoHS-compliant SMT packaging.
Supply support for ZMV835BTA 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 and TS16949-certified manufacturer specializing in high-performance analog and RF discrete semiconductors before its acquisition by Diodes Incorporated in 2008.
ZMV835BTA belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in precision oscillators and tunable filters-prioritizing CV slope linearity, Q consistency, and thermal stability over general-purpose switching performance.
FAQ
What is the maximum recommended reverse voltage for ZMV835BTA in continuous operation?
The absolute maximum reverse voltage is 25 V, but for reliable long-term operation in VCXO applications, Zetex specifies derating to ≤20 V to maintain reverse leakage below 20 nA and prevent junction degradation over temperature. Operating above 20 V increases risk of parametric shift after 1,000 hours at 85°C.
Does ZMV835BTA require special ESD handling during assembly?
Yes-ZMV835BTA is classified as Class 1B per ANSI/ESDA/JEDEC JS-001 (≤250 V HBM), requiring grounded workstations, ionized air, and static-dissipative trays. Its hyperabrupt junction is more sensitive than standard diodes; uncontrolled discharge can alter CV slope linearity or increase leakage beyond spec limits.
Can ZMV835BTA be used in series or parallel configurations for extended tuning range?
Parallel connection of two ZMV835BTA units doubles capacitance but preserves C₂/C₂₀ ratio and Q; series connection halves capacitance but degrades effective Q due to added series resistance and mismatched CV curves. Zetex does not characterize or guarantee performance in multi-device configurations-single-device use is validated.
Is the SOT23 package of ZMV835BTA compatible with standard reflow profiles for lead-free soldering?
Yes-the SOT23 package supports JEDEC J-STD-020D-compliant lead-free reflow with peak temperature ≤260°C for ≤30 seconds. Thermal mass and pad layout match IPC-7095 guidelines; no special preheat or cooling ramp rates are required beyond standard Pb-free profiles for discrete passives.
ZMV835BTA 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:
- 71.4pF @ 2V, 1MHz
- Capacitance Ratio:
- 6.5
- Capacitance Ratio Condition:
- C2/C20
- Voltage - Peak Reverse (Max):
- 25 V
- Diode Type:
- Single
- Q @ Vr, F:
- 100 @ 3V, 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
ZMV835BTA FAQ
1.How can I place an order for ZMV835BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMV835BTA 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 ZMV835BTA reliable?
The price and inventory of ZMV835BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV835BTA is usually 5 days.
3.What payment methods are accepted for ZMV835BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV835BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMV835BTA?
ZMV835BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMV835BTA 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 ZMV835BTA?
For technical support, including ZMV835BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV835BTA requirements.
6.How does Aetrix verify that ZMV835BTA is sourced from the original manufacturer or authorized distributors?
All ZMV835BTA 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 ZMV835BTA meets industry standards.
7.What is the process for return or replacement of ZMV835BTA?
All ZMV835BTA units undergo pre-shipment inspection (PSI). If there is an issue with ZMV835BTA, 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 ZMV835BTA part is unused and in its original packaging.
Return procedure for ZMV835BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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