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Diodes Incorporated ZMV833BTC
- Part No.:
- ZMV833BTC
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZMV833BTC.pdf
- Description:
- DIODE VARACTOR 25V SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
ZMV833BTC from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators, with nominal capacitance of 33.0 pF at 2 V, capacitance ratio C₂/C₂₀ = 5.0–6.5, Q ≥ 200 at 50 MHz, and reverse leakage ≤ 20 nA. It operates up to 25 V reverse bias and is packaged in SOT23 for compact RF filtering and VCXO/TCXO calibration circuits.
For engineers reviewing the ZMV833BTC datasheet, ZMV833BTC pinout, ZMV833BTC application, or ZMV833BTC equivalent, key selection criteria include its hyperabrupt CV slope (300–400 ppm/°C tempco), low phase noise contribution, high Q at VHF/UHF, and SOT23-compatible footprint for space-constrained timing modules.
Technical Context
ZMV833BTC employs a hyperabrupt junction profile to deliver steep, linearized capacitance-voltage (CV) response-critical for stable frequency pulling in voltage-controlled crystal oscillators. Its doping gradient enables predictable tuning across 2–20 V reverse bias while maintaining low series resistance.
The device achieves high Q (>200 at 50 MHz) via low-loss epitaxial silicon construction and minimized parasitic inductance in the SOT23 leadframe. Its 20 nA max reverse leakage at 20 V ensures minimal oscillator phase noise degradation in low-power wireless reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 33.0 pF nominal - sets center frequency and tuning range in 25–100 MHz VCXOs |
| Capacitance Ratio C₂/C₂₀ | 5.0–6.5 - determines maximum frequency deviation achievable under 2–20 V control voltage |
| Q Factor @ 50 MHz | ≥200 - directly limits phase noise floor in oscillator loop; higher Q improves spectral purity |
| Reverse Leakage @ 20 V | ≤20 nA - minimizes DC current injection into oscillator tank, preserving stability |
| Tempco of Capacitance | 300–400 ppm/°C - quantifies thermal drift impact on frequency accuracy over –55°C to +150°C |
| Max Reverse Voltage | 25 V - defines safe tuning voltage headroom before breakdown in active loop compensation |
| Package | SOT23 - enables automated placement and thermal performance matching with adjacent RF passives |
Pinout & Package
Package: SOT23 - 3-lead surface-mount package with cathode-marked terminal; dimensions per JEDEC TO-236AB (2.9 × 1.3 × 1.0 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC bias input / AC ground reference | Connected to fixed potential (e.g., VCC or ground) to establish reverse bias polarity |
| Cathode | RF signal node / tuning voltage interface | Connected to oscillator tank circuit and variable control voltage; carries RF current |
| Case / Exposed Pad | Thermal path / mechanical anchor | Not electrically connected; provides thermal dissipation and board-level mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Enables linearized CV slope for predictable frequency vs. voltage response in TCXO trim networks |
| Closely controlled capacitance tolerance | ±10% (B grade) - reduces binning requirements and simplifies factory calibration of oscillator modules |
| Low IR (200 pA typ.) | Minimizes DC loading on PLL charge pump outputs and preserves loop filter time constants |
| High Q at 50 MHz | Supports narrow-band VCO designs in 800 MHz–2.4 GHz front-ends without added loss compensation |
Applications
| VCXO Calibration | TCXO Temperature Compensation |
|---|---|
Use Scenario: Fine-tuning of 10–100 MHz fundamental-mode quartz crystals in telecom base station reference clocks. IC Role / Device Role / Timing Role: Voltage-variable capacitor in Pierce oscillator feedback path, adjusting resonant frequency within ±50 ppm range. Use Value: Enables digital calibration via DAC-driven bias voltage, replacing manual trimmer capacitors and improving production yield. | Use Scenario: Compensating crystal frequency drift over –40°C to +85°C in GPS receiver local oscillators. IC Role / Device Role / Timing Role: Tuning element in analog temperature-compensation network, paired with thermistor and op-amp. Use Value: Hyperabrupt slope matches crystal's parabolic tempco curve, achieving <±0.5 ppm stability across full industrial range. |
| Wireless Transceiver VCO | Pager IF Filter Tuning |
Use Scenario: Wideband VCO core in 900 MHz ISM-band transceivers requiring 10% frequency agility. IC Role / Device Role / Timing Role: Primary tuning diode in Colpitts tank, biased between 2–15 V for 870–960 MHz coverage. Use Value: High Q and low leakage maintain phase noise below –110 dBc/Hz @ 100 kHz offset, meeting ETSI spectral mask. | Use Scenario: Dynamic bandpass filter center frequency adjustment in legacy two-way pager receivers. IC Role / Device Role / Timing Role: Varactor in LC ladder filter, tuned by microcontroller DAC to switch between 455 kHz and 10.7 MHz IF bands. Use Value: Tight CV tolerance eliminates need for per-unit filter alignment, reducing test time and BOM count. |
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 | Capacitance 33 pF @ 2 V, C₂/C₂₀ = 4.5, Q = 180 @ 50 MHz, SOD-323 package | Lower Q and narrower tuning ratio reduce usable frequency deviation in high-stability VCXOs | Select when board space is constrained and ±30 ppm tuning suffices; verify thermal derating in SOD-323 |
| BBY52-02W | Capacitance 30 pF @ 2 V, C₂/C₂₀ = 5.2, Q = 220 @ 50 MHz, SOT-23 package, higher IR (50 nA) | Higher leakage increases phase noise in low-power TCXOs; requires tighter bias filtering | Prefer for high-Q VCOs where leakage is filtered; avoid in battery-powered timing modules |
Compared with ZMV833BTC, SMV2023-011LF trades tuning linearity and Q for smaller footprint, while BBY52-02W offers higher Q but introduces leakage-related phase noise risk-making ZMV833BTC optimal for balanced stability, size, and noise in telecom-grade oscillators.
Availability
ZMV833BTC is available at Aetrix Electronics and suitable for VCXO calibration, TCXO temperature compensation, and wireless transceiver VCO design requiring stable component supply, consistent CV matching, and RoHS-compliant SMT assembly.
Supply support for ZMV833BTC 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.
ZMV833BTC belongs to the 830-series hyperabrupt varactor family, engineered specifically for precision frequency control in communication infrastructure oscillators where CV linearity, low phase noise, and thermal stability are critical.
FAQ
What is the maximum reverse voltage rating for ZMV833BTC?
ZMV833BTC has a maximum reverse breakdown voltage of 25 V at IR = 10 µA, verified per Zetex Issue 11 datasheet. Operation above 20 V is discouraged in production designs due to accelerated leakage drift and reduced long-term reliability.
Does ZMV833BTC require derating at elevated temperatures?
Yes-capacitance tempco is specified as 300–400 ppm/°C, and reverse leakage rises exponentially above 85°C. For operation at 125°C, derate maximum reverse voltage to 15 V and verify Q degradation does not exceed 15% in final circuit testing.
Is ZMV833BTC compatible with lead-free reflow profiles?
Yes-ZMV833BTC in SOT23 meets JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260°C for 10 seconds. The device passed qualification per IPC/JEDEC standard for SnAgCu solder compatibility.
How does the ZMV833BTC capacitance tolerance affect oscillator calibration?
ZMV833BTC-B grade has ±10% capacitance tolerance at 2 V, meaning actual Cj ranges from 29.7–36.3 pF. This requires either factory binning or software-based DAC offset correction in closed-loop VCXOs to maintain ±1 ppm frequency accuracy after calibration.
ZMV833BTC 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:
- 34.65pF @ 2V, 1MHz
- Capacitance Ratio:
- 6.5
- Capacitance Ratio Condition:
- C2/C20
- Voltage - Peak Reverse (Max):
- 25 V
- Diode Type:
- Single
- Q @ Vr, F:
- 200 @ 3V, 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
ZMV833BTC FAQ
1.How can I place an order for ZMV833BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMV833BTC 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 ZMV833BTC reliable?
The price and inventory of ZMV833BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMV833BTC is usually 5 days.
3.What payment methods are accepted for ZMV833BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMV833BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMV833BTC?
ZMV833BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMV833BTC 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 ZMV833BTC?
For technical support, including ZMV833BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMV833BTC requirements.
6.How does Aetrix verify that ZMV833BTC is sourced from the original manufacturer or authorized distributors?
All ZMV833BTC 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 ZMV833BTC meets industry standards.
7.What is the process for return or replacement of ZMV833BTC?
All ZMV833BTC units undergo pre-shipment inspection (PSI). If there is an issue with ZMV833BTC, 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 ZMV833BTC part is unused and in its original packaging.
Return procedure for ZMV833BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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