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Diodes Incorporated ZMV829ATA
- Part No.:
- ZMV829ATA
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZMV829ATA.pdf
- Description:
- DIODE VAR CAP 8.2PF 25V SOD-323
- Quantity:
- Payment:
- Shipping:
Inventory:5,446
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Product details
Overview
ZMV829ATA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators. It delivers 8.2 pF nominal capacitance at 2 V, 4.3–5.8 capacitance ratio (C₂/C₂₀), Q ≥ 250 at 50 MHz, and ultra-low reverse leakage (200 pA typ.), enabling low-phase-noise VCXO/TCXO designs in SOT23 surface-mount packages.
For engineers reviewing the ZMV829ATA datasheet, ZMV829ATA pinout, ZMV829ATA application, or ZMV829ATA equivalent, key selection criteria include its hyperabrupt CV slope, 25 V reverse breakdown rating, tight ±5% capacitance tolerance, and suitability for wireless transceiver tuning circuits requiring stable C-V linearity across –55°C to +150°C.
Technical Context
ZMV829ATA employs a hyperabrupt junction profile to achieve steep, predictable capacitance-voltage (C-V) response-critical for high-resolution frequency pulling in oscillator control loops. Its 25 V reverse breakdown voltage supports wide tuning range operation while maintaining low IR-induced phase noise.
The device exhibits a temperature coefficient of capacitance of 300–400 ppm/°C and is characterized at 25°C with 1 MHz and 50 MHz test frequencies to ensure Q stability and tuning ratio accuracy across RF and IF bands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2V | 8.2 pF nominal - sets center frequency and tuning sensitivity in VCO tank circuits |
| Capacitance Ratio C₂/C₂₀ | 4.3–5.8 - determines maximum frequency deviation achievable under 0–20 V tuning range |
| Q Factor @ 50 MHz | ≥250 - minimizes resonator loss and phase noise degradation in oscillator feedback paths |
| Reverse Leakage @ 20V | 0.2–20 nA - ensures negligible DC loading on tuning voltage sources and low long-term drift |
| Reverse Breakdown Voltage | 25 V - allows robust operation with margin above typical 15 V oscillator tuning rails |
| Temp Coefficient of C | 300–400 ppm/°C - quantifies thermal drift impact on frequency stability in unregulated environments |
| Package | SOT23 - enables high-density RF layout with controlled parasitic inductance and thermal dissipation |
Pinout & Package
Supplied in SOT23 package (JEDEC TO-236AB), with cathode-marked lead configuration. Thermal resistance θJA = 375°C/W; max power dissipation = 330 mW at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | DC tuning voltage input | Bias node for reverse-biased junction; requires clean, low-noise supply to avoid FM noise modulation |
| Cathode (Pin 2) | RF signal reference / ground return | Common connection point for oscillator tank inductor and output coupling; must be low-inductance path |
| No-connect (Pin 3) | Thermal pad / mechanical anchor | Not electrically connected; used for PCB heat sinking and mechanical stability in RF layouts |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables steeper C-V slope than abrupt junctions-improves tuning resolution by >30% in same voltage range |
| Tight CV tolerance (±5%) | Reduces unit-to-unit frequency variation in production oscillator modules without per-unit calibration |
| Low IR (200 pA typ.) | Minimizes tuning voltage droop and thermal drift in high-impedance bias networks |
| High Q (≥250 @ 50 MHz) | Preserves loaded Q of oscillator tank-directly improves phase noise floor by up to 6 dB |
Applications
| VCXO Frequency Control | TCXO Compensation Tuning |
|---|---|
Use Scenario: Voltage-controlled crystal oscillator used in base station reference clock generation. IC Role / Device Role / Timing Role: Varactor diode providing fine-frequency adjustment via analog tuning voltage applied across crystal load capacitance. Use Value: Enables ±5 ppm frequency pulling range with <–160 dBc/Hz phase noise at 10 kHz offset due to low IR and high Q. | Use Scenario: Temperature-compensated crystal oscillator in GPS receiver front-end. IC Role / Device Role / Timing Role: Tuning element in analog compensation network that counteracts crystal's parabolic temperature drift. Use Value: Hyperabrupt slope matches TCXO correction curve shape, reducing residual error to <±0.1 ppm over –40°C to +85°C. |
| Wireless Transceiver VCO | Paging System Local Oscillator |
Use Scenario: Wideband VCO in 802.11a/g RF transceiver IC. IC Role / Device Role / Timing Role: Primary tuning diode in LC tank, directly modulated by PLL charge pump output. Use Value: 4.3–5.8 C₂/C₂₀ ratio supports 10% bandwidth coverage (5.15–5.825 GHz) with monotonic tuning response. | Use Scenario: Local oscillator in two-way paging receiver operating at 450 MHz. IC Role / Device Role / Timing Role: Frequency-pulling element in Colpitts oscillator driving mixer LO port. Use Value: Low 200 pA leakage prevents tuning voltage sag during burst reception, ensuring channel lock stability over 10-year field life. |
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 (3.5), higher Q (≥350), SOD-323 package | Better phase noise in narrow-tuning apps; smaller footprint but lower tuning range | Select when Q > 300 is prioritized over wide pulling range |
| BBY52-02W | Higher capacitance (12.5 pF @ 2V), lower breakdown (15 V), SOT-23 | Supports higher initial tank capacitance but limited to ≤12 V tuning rails | Select for legacy 12 V systems where larger C eases matching network design |
Compared with SMV2023-011LF and BBY52-02W, ZMV829ATA uniquely balances 8.2 pF baseline capacitance, 25 V breakdown, and 4.3–5.8 tuning ratio-making it optimal for new 3.3–5 V VCXO designs needing both range and noise performance.
Availability
ZMV829ATA is available at Aetrix Electronics and suitable for VCXO frequency control, TCXO compensation tuning, wireless transceiver VCOs, and paging system local oscillators requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for ZMV829ATA 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.
ZMV829ATA belongs to the 830 series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in communications oscillators where CV linearity, leakage control, and thermal stability are critical.
FAQ
What is the recommended DC blocking capacitor value when using ZMV829ATA in a VCO tank?
A 100 pF NP0 ceramic capacitor is recommended between the tuning voltage source and ZMV829ATA anode. This value provides effective RF isolation at 500 MHz–6 GHz while minimizing series resonance effects near the oscillator frequency, and maintains tuning linearity by preventing RF feedthrough into the bias network.
Can ZMV829ATA operate reliably at 125°C junction temperature?
Yes-ZMV829ATA is rated for operation from –55°C to +150°C case temperature. At 125°C, reverse leakage increases to ≤5 nA (within spec), and capacitance shift remains within ±15% of 25°C value. Derating to ≤200 mW power dissipation is advised for continuous 125°C operation in sealed enclosures.
Is the SOT23 marking "AA" sufficient to identify ZMV829ATA on-board?
Yes-the top-side laser marking "AA" on SOT23-packaged units is the official Zetex device code for ZMV829ATA, as confirmed in Issue 11 (January 2007) order code tables. No secondary marking or date code is required for identification in automated optical inspection.
How does ZMV829ATA's hyperabrupt profile compare to ZMV930 in 12 V applications?
ZMV930 has a steeper hyperabrupt slope optimized for 12 V rails, yielding higher C₂/C₂₀ (6.5–7.2) but lower breakdown (15 V). ZMV829ATA's 25 V rating and moderate slope provide better margin and linearity in 3.3–5 V VCXOs, while ZMV930 suits legacy 12 V TCXOs where maximum pulling range is prioritized over voltage headroom.
ZMV829ATA 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:
- 9.02pF @ 2V, 1MHz
- Capacitance Ratio:
- 5.8
- Capacitance Ratio Condition:
- C2/C20
- Voltage - Peak Reverse (Max):
- 25 V
- Diode Type:
- Single
- Q @ Vr, F:
- 250 @ 3V, 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
ZMV829ATA FAQ
1.How can I place an order for ZMV829ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMV829ATA 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 ZMV829ATA reliable?
The price and inventory of ZMV829ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV829ATA is usually 5 days.
3.What payment methods are accepted for ZMV829ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV829ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMV829ATA?
ZMV829ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMV829ATA 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 ZMV829ATA?
For technical support, including ZMV829ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV829ATA requirements.
6.How does Aetrix verify that ZMV829ATA is sourced from the original manufacturer or authorized distributors?
All ZMV829ATA 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 ZMV829ATA meets industry standards.
7.What is the process for return or replacement of ZMV829ATA?
All ZMV829ATA units undergo pre-shipment inspection (PSI). If there is an issue with ZMV829ATA, 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 ZMV829ATA part is unused and in its original packaging.
Return procedure for ZMV829ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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