My Inquiry
My Account
Diodes Incorporated ZMV829BTA
- Part No.:
- ZMV829BTA
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZMV829BTA.pdf
- Description:
- DIODE VAR CAP 8.2PF 25V SOD-323
- Quantity:
- Payment:
- Shipping:
Inventory:7,752
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZMV829BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 7.79–8.61 pF capacitance at 2 V, 4.3–5.8 capacitance ratio (C₂/C₂₀), Q ≥ 250 at 50 MHz, and reverse leakage ≤ 200 pA - enabling low-phase-noise VCXO/TCXO designs in SOT23 surface-mount packages.
For engineers reviewing the ZMV829BTA datasheet, ZMV829BTA pinout, ZMV829BTA application, or ZMV829BTA equivalent, key selection criteria include its hyperabrupt CV slope, tight ±5% C tolerance at 2 V, 25 V breakdown rating, -55°C to +150°C operating range, and SOT23 package compatibility with high-density RF layouts.
Technical Context
ZMV829BTA is a single-die, cathode-marked hyperabrupt junction varactor designed for nonlinear voltage-to-capacitance conversion. Its doping profile yields steep, predictable CV characteristics (dC/dV ≈ −0.5 pF/V near 2 V) and minimal temperature coefficient (300–400 ppm/°C).
The device operates exclusively under reverse bias, with maximum 20 V recommended tuning range and absolute 25 V breakdown limit. Its 250 mW power dissipation rating (SOT23) and 200 pA typical IR support ultra-low-noise oscillator core integration without thermal drift or leakage-induced detuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 7.79–8.61 pF - sets nominal center frequency and tuning bandwidth in VCO tank circuits |
| Capacitance Ratio C₂/C₂₀ | 4.3–5.8 - determines total frequency deviation range in VCXO applications |
| Q Factor @ 50 MHz | ≥250 - directly limits phase noise floor in oscillator loop; higher Q improves spectral purity |
| Reverse Leakage @ 20 V | ≤20 nA - ensures stable bias point and prevents capacitor voltage droop over time |
| Breakdown Voltage | 25 V - defines maximum safe tuning voltage margin before junction avalanche |
| Tempco @ 3 V | 300–400 ppm/°C - quantifies capacitance drift per degree, critical for TCXO compensation design |
| Package | SOT23 - enables automated placement, RF shielding via ground pad, and thermal relief in 2-layer PCBs |
Pinout & Package
SOT23 package: 3-lead surface-mount plastic case with cathode marked on top surface; leads are anode (pin 1), cathode (pin 2), and no internal connection (pin 3 - unused, isolated).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | DC bias input node; connected to tuning voltage source through current-limiting resistor |
| Pin 2 | Cathode | RF signal path node; tied to inductor/resonator in VCO tank; marked side of package |
| Pin 3 | NC (No Connection) | Internally unconnected; must remain floating or grounded only if required for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables steeper dC/dV slope than abrupt junctions - increases tuning sensitivity without increasing control voltage range |
| Tight CV tolerance (±5% at 2 V) | Reduces unit-to-unit frequency spread in production VCXOs - lowers calibration overhead and binning cost |
| Low IR (200 pA typ.) | Minimizes DC loading on tuning DAC or potentiometer - preserves linearity and long-term bias stability |
| High Q (250 min. @ 50 MHz) | Directly improves oscillator phase noise by >6 dB compared to Q = 100 varactors at same frequency |
Applications
| VCXO Frequency Control | TCXO Temperature Compensation |
|---|---|
Use Scenario: Tuning element in 10–100 MHz crystal oscillator loops where fine frequency adjustment (< ±50 ppm) is required via analog voltage. IC Role / Device Role / Timing Role: Voltage-variable capacitor forming resonant tank with AT-cut quartz crystal and series inductor. Use Value: Hyperabrupt slope provides 0.4–0.6 pF/V tuning gain - sufficient for DAC-driven calibration without external op-amp buffering. | Use Scenario: Secondary tuning capacitor in analog temperature-compensated crystal oscillator (TCXO) networks, paired with thermistor-based voltage divider. IC Role / Device Role / Timing Role: Adjustable reactance node that counteracts crystal's negative tempco by varying tank impedance vs. temperature. Use Value: Tight ±5% C tolerance at 2 V reduces initial offset error in compensation curve - cuts factory trim time by ~30%. |
| Wireless IF Filter Tuning | Pager Receiver Front-End |
Use Scenario: Center-frequency tuning element in 45–500 MHz bandpass filters for software-defined radio receivers. IC Role / Device Role / Timing Role: Varactor coupled to LC resonator to shift passband in response to baseband control voltage. Use Value: Q ≥ 250 maintains filter insertion loss < 2.5 dB across full tuning range - avoids need for active gain stages. | Use Scenario: Local oscillator tuning component in narrowband FM pager receiver ICs operating at 136–174 MHz. IC Role / Device Role / Timing Role: Bias-controlled capacitance adjusting VCO frequency to match channel spacing (12.5/25 kHz) under battery-voltage variation. Use Value: 200 pA IR ensures < 0.1 ppm/h frequency drift during 24-h standby - meets ETSI EN 300 220-1 long-term stability requirement. |
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 | Higher C (10.5–11.5 pF @ 2 V); lower C₂/C₂₀ (3.8); Q = 200 @ 50 MHz | Better suited for wider-tuning IF filters; less precise for VCXO center-frequency lock | Select when broader absolute frequency range needed over tighter C matching |
| BBY52-02W | Lower C (4.5–5.2 pF @ 2 V); higher C₂/C₂₀ (6.5); Q = 300 @ 50 MHz | Optimized for UHF VCOs (>500 MHz); requires higher tuning voltage for same Δf | Select when operating above 400 MHz or phase noise below −145 dBc/Hz @ 10 kHz is mandatory |
Compared with SMV2023-011LF and BBY52-02W, ZMV829BTA offers the best balance of mid-band capacitance, tight tolerance, and proven VCXO stability - making it preferred for 10–100 MHz telecom timing modules where production yield and calibration repeatability are critical.
Availability
ZMV829BTA is available at Aetrix Electronics and suitable for VCXO design, TCXO manufacturing, and wireless IF filter development requiring stable component supply across multi-year production cycles.
Supply support for ZMV829BTA 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 designer and manufacturer of high-performance analog and RF semiconductors, acquired by Diodes Incorporated in 2008.
ZMV829BTA belongs to the 830-series hyperabrupt varactor family, engineered specifically for low-phase-noise frequency control in telecom timing systems and portable RF front-ends where CV linearity and thermal stability are design-critical.
FAQ
What is the maximum recommended reverse tuning voltage for ZMV829BTA?
The maximum recommended reverse tuning voltage is 20 V, well below its 25 V breakdown rating. Operating beyond 20 V risks accelerated aging and increased leakage, especially at elevated temperatures. Designers should maintain ≥5 V margin to ensure long-term reliability in commercial-grade oscillators.
Does ZMV829BTA require derating at high ambient temperatures?
Yes - reverse leakage doubles approximately every 10°C rise above 25°C. At 85°C, IR may reach 3.2 nA (vs. 0.2 nA typ. at 25°C), potentially causing measurable frequency drift in sensitive VCXOs. Derate tuning voltage by 10% above 70°C or implement thermal compensation in control loop.
Can ZMV829BTA be used in dual-common-cathode configurations?
No - ZMV829BTA is a single-diode variant in SOT23. Dual configurations (e.g., ZMDC831BTA) use SOT323 or SOD323 packages with shared cathode pins. Substituting ZMV829BTA into dual layouts will result in incorrect biasing and open-circuit behavior at one junction.
Is ZMV829BTA RoHS-compliant and lead-free?
Yes - ZMV829BTA is fully RoHS-compliant and lead-free per EU Directive 2011/65/EU. The SOT23 package uses matte tin (Sn) lead finish with no lead content in die attach, bond wires, or molding compound, verified per JEDEC J-STD-020 moisture sensitivity level 1.
ZMV829BTA 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:
- 8.61pF @ 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
ZMV829BTA FAQ
1.How can I place an order for ZMV829BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMV829BTA 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 ZMV829BTA reliable?
The price and inventory of ZMV829BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV829BTA is usually 5 days.
3.What payment methods are accepted for ZMV829BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV829BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMV829BTA?
ZMV829BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMV829BTA 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 ZMV829BTA?
For technical support, including ZMV829BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV829BTA requirements.
6.How does Aetrix verify that ZMV829BTA is sourced from the original manufacturer or authorized distributors?
All ZMV829BTA 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 ZMV829BTA meets industry standards.
7.What is the process for return or replacement of ZMV829BTA?
All ZMV829BTA units undergo pre-shipment inspection (PSI). If there is an issue with ZMV829BTA, 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 ZMV829BTA part is unused and in its original packaging.
Return procedure for ZMV829BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMV829BTA Tags
-
BBY5702VH6327XTSA1
Infineon Technologies
-
BBY5602VH6327XTSA1
Infineon Technologies
-
SMV1405-040LF
Skyworks Solutions Inc.
-
BBY6502VH6327XTSA1
Infineon Technologies
-
BBY6602VH6327XTSA1
Infineon Technologies
-
BBY5802VH6327XTSA1
Infineon Technologies
.jpg)
-
BB175X
NXP USA Inc.
-
SMV1430-040LF
Skyworks Solutions Inc.
-
SMV1273-079LF
Skyworks Solutions Inc.
-
SMV1255-079LF
Skyworks Solutions Inc.
-
SMV1213-079LF
Skyworks Solutions Inc.
-
SMV1247-079LF
Skyworks Solutions Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
