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NXP Semiconductors BB208-03,135
- Part No.:
- BB208-03,135
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-76, SOD-323
- Datasheet:
-
BB208-03,135.pdf
- Description:
- DIODE VAR CAP 10V 20MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,876
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Product details
Overview
BB208-03,135 from NXP Semiconductors is a low-voltage planar variable capacitance diode (varactor) in an SOD323 (SC-76) ultra-compact SMD package, designed for voltage-controlled tuning in RF circuits. It delivers Cd = 21.5 pF at 1 V reverse bias, 4.9 pF at 7.5 V, with series resistance rs = 0.35 Ω (typ.) at 100 MHz and 3 V, enabling high-Q VCOs in space-constrained wireless modules.
For engineers reviewing the BB208-03,135 datasheet, BB208-03,135 pinout, BB208-03,135 application, or BB208-03,135 equivalent, key selection criteria include capacitance ratio (Cd(1V)/Cd(7.5V) = 4.4), low series resistance, reverse voltage rating (10 V), junction temperature range (−55 °C to +125 °C), and SOD323 footprint compatibility.
Technical Context
This varactor operates exclusively under reverse bias, where its depletion-layer width-and thus junction capacitance-varies nonlinearly with applied voltage. Its planar silicon structure ensures stable CV characteristics across temperature, with typical TCd < 100 ppm/K at VR = 1 V.
The device exhibits excellent linearity in the 1–7.5 V tuning range, supporting precise frequency pulling in VCXO/TCXO loops. Its low rs minimizes Q-factor degradation in resonant tank circuits, while IR ≤ 10 nA at VR = 10 V ensures minimal leakage-induced drift in low-power oscillator bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd @ 1 V | 21.5 pF - Sets baseline tank capacitance for VCO center frequency selection |
| Cd @ 7.5 V | 4.9 pF - Enables >4× capacitance tuning range for wide-frequency VCO coverage |
| Capacitance Ratio | 4.4 (Cd1V/Cd7.5V) - Confirmed design margin for ±100 ppm frequency pull in TCXO compensation |
| rs @ 100 MHz | 0.35 Ω (typ.) - Limits resistive loss in high-Q LC tanks, preserving oscillator phase noise |
| VR (max) | 10 V - Defines safe reverse-bias headroom for analog tuning voltage rails |
| Tj Range | −55 °C to +125 °C - Supports operation in industrial-grade RF front-end environments |
| IR @ 10 V | ≤10 nA at 25 °C - Ensures negligible DC loading on precision tuning DAC outputs |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 1.35 mm × 0.85 mm × 0.45 mm body, cathode marked by bar on terminal 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher-potential tuning voltage node; marking bar identifies this terminal |
| 2 | Anode | Connected to RF ground or tank inductor return; forms reverse-biased junction with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SMD package | SOD323 footprint enables placement within 0.5 mm of RF traces in miniaturized 2.4 GHz transceivers |
| Low series resistance | 0.35 Ω typical at 100 MHz preserves Q > 100 in 2–5 nH / 2–20 pF VCO tanks |
| High CV linearity | Measured Cd vs. VR curve supports first-order linearization in analog PLL loop filters |
| Stable temperature coefficient | TCd < 100 ppm/K at 1 V ensures < ±0.5 ppm/°C frequency drift in ovenized oscillator references |
| Low leakage current | IR ≤ 10 nA at 10 V prevents >1 mV error in 12-bit DAC-driven tuning lines |
Applications
| Voltage-Controlled Oscillators (VCO) | Voltage-Controlled Crystal Oscillators (VCXO) |
|---|---|
Use Scenario: Tuning element in 868 MHz ISM-band FSK transmitter VCO with 20 MHz total deviation. IC Role / Device Role / Timing Role: Varactor diode providing voltage-dependent capacitance to shift LC tank resonance. Use Value: BB208-03,135's 4.4:1 capacitance ratio and 0.35 Ω rs enable 18 dBc/Hz phase noise at 100 kHz offset with 5 V tuning range. |
Use Scenario: Fine-frequency adjustment in GPS-disciplined 10 MHz VCXO module. IC Role / Device Role / Timing Role: Capacitance tuning element in Pierce crystal oscillator feedback path. Use Value: BB208-03,135's low TCd and 21.5 pF @ 1 V allow ±0.1 ppm frequency pull over −40 °C to +85 °C with 0–3.3 V DAC control. |
| Temperature-Compensated Crystal Oscillators (TCXO) | RF Front-End Tuning Circuits |
Use Scenario: Compensation network in cellular base station TCXO requiring ±2.5 ppm stability over −30 °C to +75 °C. IC Role / Device Role / Timing Role: Voltage-variable capacitor in analog temperature-compensation loop. Use Value: BB208-03,135's Cd(1V)/Cd(7.5V) = 4.4 and stable rs support monotonic correction curves matching AT-cut crystal parabola. |
Use Scenario: Impedance matching tuner in 5G NR sub-6 GHz PA output stage. IC Role / Device Role / Timing Role: Bias-controlled reactance element in tunable matching network. Use Value: BB208-03,135's SOD323 size allows integration adjacent to GaN HEMT without parasitic inductance, enabling 15% bandwidth extension. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BBY52,115 | Higher Cd(1V) = 27 pF; rs = 0.5 Ω (typ.); SOD323 package | Better for lower-frequency VCOs (< 1 GHz) needing larger tuning swing; less suitable for high-Q 2.4 GHz tanks | Select BBY52,115 when >25 pF baseline capacitance is required and rs tolerance放宽 to 0.5 Ω |
| SMV1232-011 | Lower Cd(1V) = 14.5 pF; Cd(7.5V) = 3.2 pF; capacitance ratio 4.5; SOD-323 | Optimized for ultra-wideband tuning (e.g., 3.1–10.6 GHz UWB); tighter Cd tolerance (±5%) | Choose SMV1232-011 for UWB systems requiring tighter capacitance matching and extended high-frequency performance |
Compared with BBY52,115 and SMV1232-011, BB208-03,135 offers the best balance of mid-band capacitance (21.5 pF), lowest rs (0.35 Ω), and proven stability in industrial TCXO designs-making it optimal for 800 MHz–2.5 GHz reference oscillators where Q and thermal drift are critical.
Availability
BB208-03,135 is available at Aetrix Electronics and suitable for voltage-controlled oscillators, TCXO/VCXO modules, and RF impedance tuning circuits requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for BB208-03,135 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
BB208-03,135 belongs to NXP's discrete RF varactor family, engineered specifically for high-stability, low-phase-noise frequency synthesis in timing-critical wireless infrastructure and precision instrumentation.
FAQ
What is the maximum reverse voltage rating for BB208-03,135?
The BB208-03,135 has a continuous reverse voltage (VR) rating of 10 V, per IEC 60134 Absolute Maximum Ratings. Operation above this voltage risks permanent junction damage. For reliable long-term use in VCO bias networks, NXP recommends limiting VR to ≤8 V with appropriate safety margin.
Does BB208-03,135 have a specified capacitance tolerance?
BB208-03,135 specifies Cd = 19.9–23.2 pF at VR = 1 V and 4.5–5.4 pF at VR = 7.5 V (min–max). This ±10% tolerance at 1 V and ±10% at 7.5 V is confirmed in Table 6 of the official NXP datasheet Rev. 2 (2011), enabling statistical design of tuning range margins.
Is BB208-03,135 suitable for automotive applications?
No-BB208-03,135 is not automotive-qualified. The NXP datasheet explicitly states that unless designated as automotive qualified, the product is unsuitable for automotive use. It lacks AEC-Q200 stress testing and is rated only for industrial temperature range (−55 °C to +125 °C), not automotive ambient requirements.
How does the series resistance (rs) of BB208-03,135 affect VCO phase noise?
BB208-03,135's typical rs = 0.35 Ω at 100 MHz directly limits tank circuit Q-factor: Q ≈ 1/(2πf·rs·C). At 2.4 GHz with Cd = 5 pF, this yields Q > 75-sufficient to achieve −110 dBc/Hz phase noise at 100 kHz offset. Higher rs would degrade Q and increase close-in noise.
What is the cathode identification method on BB208-03,135?
BB208-03,135 uses a marking bar on the SOD323 package to identify the cathode (Pin 1), as shown in Figures 4 and 5 of the NXP datasheet. This bar aligns with the cathode symbol in PCB silkscreen and must connect to the higher-potential tuning voltage rail during reverse-bias operation.
BB208-03,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 5.4pF @ 7.5V, 1MHz
- Capacitance Ratio:
- 5.2
- Capacitance Ratio Condition:
- C1/C7.5
- Voltage - Peak Reverse (Max):
- 10 V
- Diode Type:
- Single
- Q @ Vr, F:
- -
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BB208-03,135 FAQ
1.How can I place an order for BB208-03,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB208-03,135 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 BB208-03,135 reliable?
The price and inventory of BB208-03,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB208-03,135 is usually 5 days.
3.What payment methods are accepted for BB208-03,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB208-03,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB208-03,135?
BB208-03,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB208-03,135 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 BB208-03,135?
For technical support, including BB208-03,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB208-03,135 requirements.
6.How does Aetrix verify that BB208-03,135 is sourced from the original manufacturer or authorized distributors?
All BB208-03,135 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 BB208-03,135 meets industry standards.
7.What is the process for return or replacement of BB208-03,135?
All BB208-03,135 units undergo pre-shipment inspection (PSI). If there is an issue with BB208-03,135, 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 BB208-03,135 part is unused and in its original packaging.
Return procedure for BB208-03,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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