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Diodes Incorporated ZMV835BTC
- Part No.:
- ZMV835BTC
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZMV835BTC.pdf
- Description:
- DIODE VARACTOR 25V SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,968
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Product details
Overview
ZMV835BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators. It delivers 68.0 pF nominal capacitance at 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), Q ≥ 100 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 ZMV835BTC datasheet, ZMV835BTC pinout, ZMV835BTC application, or ZMV835BTC equivalent, key selection criteria include its 25 V reverse breakdown rating, −55°C to +150°C operating range, SOT23 package compatibility, and verified hyperabrupt CV slope for steep tuning response in compact RF modules.
Technical Context
ZMV835BTC operates as a voltage-dependent capacitor with hyperabrupt doping profile, yielding a steep, predictable C–V curve essential for linear frequency modulation in oscillator control loops. Its capacitance varies from ~74.8 pF at 2 V to ~11.4 pF at 20 V (C₂/C₂₀ ≈ 6.5), supporting wide tuning bandwidths without external compensation.
The device exhibits high Q (>100 @ 50 MHz) due to low series resistance and minimized dielectric loss, directly contributing to phase noise reduction in crystal oscillator circuits. Its 200 pA typical reverse leakage at 20 V ensures minimal DC bias current injection into sensitive oscillator nodes, preserving loop stability and long-term frequency accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 68.0 pF nominal - sets baseline resonant frequency in parallel-tuned LC tank |
| Capacitance Ratio C₂/C₂₀ | 5.0–6.5 - enables >100 ppm tuning range in TCXO/VCXO applications |
| Q Factor @ 50 MHz | ≥100 - minimizes phase noise contribution in oscillator feedback path |
| Reverse Leakage @ 20 V | 0.2–20 nA - prevents bias drift and thermal runaway in closed-loop tuning |
| Reverse Breakdown Voltage | 25 V - supports robust operation under transient overvoltage in RF front-end bias networks |
| Temp. Coeff. of C | 300–400 ppm/°C - quantifies thermal drift impact on center frequency stability |
| Package | SOT23 - enables automated placement and high-density layout in miniaturized RF modules |
Pinout & Package
SOT23 package: 3-terminal surface-mount plastic case with cathode-marked lead (Pin 3), anode (Pin 1), and common cathode (Pin 2) for dual-diode variants; ZMV835BTC is single-diode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | DC bias input node - must be AC-coupled to avoid forward conduction during tuning |
| Pin 2 | Cathode | RF ground reference - connects directly to oscillator tank ground plane for minimal parasitic inductance |
| Pin 3 | Cathode Mark | Physical polarity indicator - aligns with PCB silkscreen for error-proof assembly |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables linearized frequency vs. voltage response in VCXOs without external compensation networks |
| Closely controlled CV tolerance | ±5% capacitance spread (ZMV835B grade) - reduces binning and calibration overhead in production |
| Low IR (200 pA typ.) | Maintains stable tuning voltage under high-impedance bias conditions, preventing frequency drift |
| High Q ≥100 @ 50 MHz | Directly improves oscillator phase noise floor by >3 dB compared to standard abrupt-junction varactors |
| −55°C to +150°C operation | Validates use in automotive under-hood and industrial base station environments without derating |
Applications
| VCXO Frequency Tuning | TCXO Temperature Compensation |
|---|---|
Use Scenario: Fine frequency adjustment in 10–100 MHz crystal oscillators using analog voltage control. IC Role / Device Role / Timing Role: Voltage-variable capacitor in Colpitts oscillator feedback network, modulating resonant frequency. Use Value: 6.5:1 C₂/C₂₀ ratio provides >120 ppm tuning range while maintaining Q > 100 for sub-100 fs integrated jitter. | Use Scenario: Compensating crystal frequency drift across −40°C to +85°C ambient in GPS timing modules. IC Role / Device Role / Timing Role: Active capacitance element in analog temperature-compensation loop, paired with thermistor network. Use Value: Tight ±5% CV tolerance (ZMV835B) reduces calibration points needed per batch, cutting test time by 30%. |
| Mobile Radio Transceiver LO | Wireless Baseband Filter Tuning |
Use Scenario: Local oscillator frequency agility in 800/900 MHz PHS and TETRA handheld radios. IC Role / Device Role / Timing Role: Tuning element in VCO core, enabling channel switching within <10 μs settling time. Use Value: Hyperabrupt slope delivers 2× faster frequency slew vs. standard varactors, meeting fast-hopping protocol requirements. | Use Scenario: Adaptive bandpass filter center frequency alignment in LTE femtocell front-ends. IC Role / Device Role / Timing Role: Variable capacitor in switched-capacitor filter bank, reconfiguring passband in real time. Use Value: 25 V breakdown rating allows direct interface with 15 V DAC outputs, eliminating level-shifting circuitry. |
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 = 47 pF, higher Q = 150 @ 50 MHz, SOD-323 package | Better phase noise in low-capacitance VCOs; limited tuning range due to lower C₂/C₂₀ (4.2) | Select when optimizing for ultra-low jitter in <50 MHz oscillators where size permits SOD-323 |
| BBY58-02W | Higher C₂ = 82 pF, lower Q = 75 @ 50 MHz, SOT-23 package | Wider absolute tuning range but increased phase noise; less stable over temperature | Prefer for cost-sensitive 2G/3G transceivers where moderate jitter is acceptable |
Compared with SMV2023-011LF and BBY58-02W, ZMV835BTC uniquely balances mid-range capacitance (68 pF), steep hyperabrupt slope (C₂/C₂₀ = 6.5), and SOT23 compatibility-making it optimal for space-constrained, high-stability VCXOs requiring both wide tuning and low noise.
Availability
ZMV835BTC is available at Aetrix Electronics and suitable for VCXO design, TCXO manufacturing, and mobile radio transceiver development requiring stable component supply and full traceability through Zetex's authorized distribution chain.
Supply support for ZMV835BTC 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 ISO 9001/TS16949-certified manufacturer specializing in high-performance analog and RF discrete semiconductors.
ZMV835BTC belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in wireless timing systems where CV linearity, thermal stability, and miniature packaging are critical.
FAQ
What is the maximum recommended reverse voltage for continuous operation?
The absolute maximum reverse voltage is 25 V, but Zetex specifies 20 V as the rated operating limit for long-term reliability. Operating continuously above 20 V increases risk of parametric shift and accelerated aging due to field-enhanced leakage; design margin should maintain VR ≤ 18 V in production circuits.
Does ZMV835BTC require external biasing components for VCXO use?
Yes - a high-impedance DC bias network (typically ≥1 MΩ) and AC coupling capacitor (≥100 pF) are mandatory to isolate the varactor from oscillator AC signals while delivering stable tuning voltage. Direct connection to op-amp outputs without series resistance risks instability and excess current injection.
How does the temperature coefficient of capacitance affect TCXO performance?
With a TC of +300 to +400 ppm/°C, ZMV835BTC introduces predictable positive capacitance drift versus temperature. In TCXO designs, this is actively compensated using negative-TC thermistors or digital lookup tables, enabling net frequency stability better than ±0.1 ppm over −40°C to +85°C.
Is ZMV835BTC RoHS-compliant and lead-free?
Yes - Zetex confirmed full RoHS compliance per Directive 2011/65/EU in Issue 11 (January 2007) documentation. The SOT23 package uses matte tin (Sn) lead finish with no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE, and meets JEDEC J-STD-020 moisture sensitivity level 1.
ZMV835BTC 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
ZMV835BTC FAQ
1.How can I place an order for ZMV835BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMV835BTC 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 ZMV835BTC reliable?
The price and inventory of ZMV835BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV835BTC is usually 5 days.
3.What payment methods are accepted for ZMV835BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV835BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMV835BTC?
ZMV835BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMV835BTC 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 ZMV835BTC?
For technical support, including ZMV835BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV835BTC requirements.
6.How does Aetrix verify that ZMV835BTC is sourced from the original manufacturer or authorized distributors?
All ZMV835BTC 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 ZMV835BTC meets industry standards.
7.What is the process for return or replacement of ZMV835BTC?
All ZMV835BTC units undergo pre-shipment inspection (PSI). If there is an issue with ZMV835BTC, 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 ZMV835BTC part is unused and in its original packaging.
Return procedure for ZMV835BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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