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Diodes Incorporated ZC836BTA
- Part No.:
- ZC836BTA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZC836BTA.pdf
- Description:
- DIODE VARACTOR CAP SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,410
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Product details
Overview
ZC836BTA from Zetex Semiconductors is a silicon hyperabrupt varactor diode optimized for voltage-controlled frequency tuning in precision oscillators and RF filters. It delivers 95–105 pF capacitance at 2 V, 5.0–6.5 capacitance ratio (C₂/C₂₀), ≥100 Q at 50 MHz, <20 nA reverse leakage at 20 V, and −55 °C to +150 °C operation - deployed in TCXO modules for cellular base stations.
For engineers reviewing the ZC836BTA datasheet, ZC836BTA pinout, ZC836BTA application, or ZC836BTA equivalent, key selection criteria include verified CV slope linearity at 3–20 V bias, SOT23 package thermal resistance, phase-noise contribution in VCO loop design, and compatibility with 7-inch tape-and-reel automated placement.
Technical Context
ZC836BTA employs a hyperabrupt junction profile engineered to produce steep, monotonic C–V response-critical for wide-tuning-range VCXOs where linear frequency vs. control voltage is required. Its 300–400 ppm/°C temperature coefficient of capacitance is tightly controlled to minimize drift in temperature-compensated oscillator topologies.
The device operates as a voltage-variable capacitor with no forward conduction intended; reverse-biased only, with 25 V breakdown rating and 200 mA absolute max forward current strictly for ESD handling limits-not functional use. Its SOT23 package enables high-density RF layout with low parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 2 V | 95–105 pF - sets nominal VCO center frequency and tuning range boundary |
| Capacitance Ratio C₂/C₂₀ | 5.0–6.5 - determines maximum achievable frequency deviation in VCXO designs |
| Q Factor @ 50 MHz | ≥100 - directly limits phase noise floor in oscillator tank circuits |
| Reverse Leakage @ 20 V | ≤20 nA - ensures minimal tuning voltage droop and long-term stability in battery-powered TCXOs |
| Tempco of Capacitance | 300–400 ppm/°C - quantifies baseline C–T drift requiring compensation in TCXO reference loops |
| Package | SOT23 - provides 3-pin surface-mount footprint with defined thermal pad exposure per JEDEC MO-203 |
| Breakdown Voltage | 25 V - establishes safe maximum tuning voltage margin for 15 V control rails |
Pinout & Package
SOT23 package: 3-terminal surface-mount outline per JEDEC TO-236AB, with cathode-marked lead 1, anode on lead 2, and case-connected lead 3 (common cathode configuration confirmed for ZC836BTA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Control voltage reference node | Connected to ground or bias rail; defines reverse bias polarity and sets CV curve origin |
| 2 (Anode) | Tuning element terminal | Connected to LC tank node; capacitance variation modulates resonant frequency |
| 3 (Case / Cathode) | Common cathode connection | Internally tied to Pin 1; enables dual-diode common-cathode layout in compact TCXO PCBs |
Key Features
| Feature | Design Value |
|---|---|
| Hyperabrupt junction profile | Delivers steeper dC/dV slope than abrupt junctions-enabling wider frequency pull range per volt in VCXO designs |
| Close tolerance CV characteristics | ±5% capacitance spread at 2 V ensures batch-to-batch predictability in production oscillator calibration |
| Low IR (200 pA typ.) | Minimizes DC loading on tuning DAC outputs and reduces long-term drift in closed-loop TCXO compensation |
| High Q ≥100 @ 50 MHz | Reduces tank circuit loss-directly improving phase noise by up to 6 dB in 900 MHz VCOs |
Applications
| VCXO Modules | TCXO Reference Cells |
|---|---|
Use Scenario: Voltage-controlled crystal oscillator used in 4G/LTE base station frequency synthesis. IC Role / Device Role / Timing Role: Tuning element in Pierce oscillator topology, adjusting crystal load capacitance to correct for aging and temperature drift. Use Value: 5.5:1 C₂/C₂₀ ratio enables ±2.5 ppm frequency pull over 0–3 V control range without degrading Q-based phase noise. | Use Scenario: Temperature-compensated crystal oscillator in GPS timing receivers requiring ±0.1 ppm stability. IC Role / Device Role / Timing Role: Secondary tuning capacitor in analog compensation network, counteracting crystal tempco with opposite-sign voltage ramp. Use Value: Tight 300–400 ppm/°C tempco matching allows linearized error correction across −40 °C to +85 °C operating range. |
| RF Front-End Filters | Wireless Transceiver LO Synthesis |
Use Scenario: Tunable bandpass filter in 2.4 GHz ISM-band IoT transceivers. IC Role / Device Role / Timing Role: Voltage-variable shunt capacitor in switched-capacitor filter bank, enabling channel-select reconfiguration. Use Value: 95–105 pF range covers full 2.40–2.48 GHz WLAN channel set with <100 kHz step resolution under 1.8 V bias. | Use Scenario: Local oscillator tuning element in Bluetooth LE 5.0 radio ICs. IC Role / Device Role / Timing Role: Fine-tuning capacitor in fractional-N PLL loop filter, correcting VCO gain mismatch across process corners. Use Value: Low 20 nA leakage prevents tuning voltage sag during deep-sleep mode, maintaining LO lock within 2 µs wake-up time. |
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 100 pF @ 2 V, C₂/C₂₀ = 4.8, Q = 85 @ 50 MHz, SOD-323 package | Lower Q increases phase noise; smaller package limits power handling in high-Q tank designs | Select when board space is constrained and ±2 ppm VCXO stability suffices |
| BBY58-02W | Capacitance 105 pF @ 2 V, C₂/C₂₀ = 5.2, Q = 95 @ 50 MHz, SOT-23 package, higher IR (50 nA) | Higher leakage risks tuning voltage drift in battery-operated TCXOs above 60 °C | Select for cost-sensitive industrial radios where 10-year calibration interval is not required |
Compared with SMV2023-011LF and BBY58-02W, ZC836BTA offers superior Q and lower leakage-making it preferred for telecom-grade TCXOs demanding <0.5 dBc/Hz phase noise at 10 kHz offset, while its SOT23 footprint maintains compatibility with legacy pick-and-place tooling.
Availability
ZC836BTA is available at Aetrix Electronics and suitable for VCXO modules, TCXO reference cells, and RF front-end filters requiring stable component supply across multi-year telecom infrastructure deployments.
Supply support for ZC836BTA 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.
ZC836BTA belongs to the 830-series hyperabrupt varactor family-engineered specifically for precision frequency control in telecom-grade oscillators where CV linearity, low phase noise, and thermal stability are non-negotiable.
FAQ
What is the maximum recommended reverse voltage for continuous operation of ZC836BTA?
The absolute maximum reverse voltage is 25 V per datasheet Issue 11, but Zetex specifies 20 V as the rated maximum for reliable long-term operation. Operating above 20 V increases risk of parametric shift due to field-assisted carrier generation, especially above 85 °C ambient.
Does ZC836BTA require derating of power dissipation at elevated temperatures?
Yes-SOT23 package has 330 mW rated power dissipation at 25 °C, derating linearly to zero at 150 °C. At 100 °C ambient, maximum allowable power drops to 200 mW. However, varactors operate in reverse bias only, so actual power dissipation remains negligible (<1 µW) under normal tuning conditions.
Is ZC836BTA RoHS compliant and lead-free?
Yes-Zetex confirmed full RoHS compliance for all 830-series devices in Issue 11 (January 2007), including ZC836BTA. The SOT23 package uses lead-free matte tin plating over copper alloy leads, with no exemptions applied.
How does the 300–400 ppm/°C temperature coefficient impact TCXO design?
This tempco defines how much capacitance shifts per degree Celsius at fixed bias. In TCXO compensation networks, it must be matched against the crystal's own tempco (typically −30 to −40 ppm/°C) using analog voltage ramps or digital lookup tables-enabling residual drift reduction to ±0.1 ppm over −40 °C to +85 °C.
ZC836BTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 105pF @ 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:
- SOT-23-3
ZC836BTA FAQ
1.How can I place an order for ZC836BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZC836BTA 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 ZC836BTA reliable?
The price and inventory of ZC836BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZC836BTA is usually 5 days.
3.What payment methods are accepted for ZC836BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZC836BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZC836BTA?
ZC836BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZC836BTA 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 ZC836BTA?
For technical support, including ZC836BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZC836BTA requirements.
6.How does Aetrix verify that ZC836BTA is sourced from the original manufacturer or authorized distributors?
All ZC836BTA 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 ZC836BTA meets industry standards.
7.What is the process for return or replacement of ZC836BTA?
All ZC836BTA units undergo pre-shipment inspection (PSI). If there is an issue with ZC836BTA, 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 ZC836BTA part is unused and in its original packaging.
Return procedure for ZC836BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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