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NXP Semiconductors BB181LX,315
- Part No.:
- BB181LX,315
- Manufacturer:
- NXP Semiconductors
- Package:
- SOD-882
- Datasheet:
-
BB181LX,315.pdf
- Description:
- DIODE VHF VAR CAP 32V SOD882
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
BB181LX,315 from NXP Semiconductors is a planar technology variable capacitance diode (varactor) designed for VHF tuning applications, featuring 1.055 pF typical capacitance at 28 V reverse bias, 14:1 capacitance ratio (0.5 V to 28 V), and 2.0 Ω typical series resistance at 470 MHz - deployed in voltage-controlled oscillators and satellite tuner front-ends.
For engineers reviewing the BB181LX,315 datasheet, BB181LX,315 pinout, BB181LX,315 application, or BB181LX,315 equivalent, key selection criteria include reverse voltage range (0–32 V), junction temperature limits (−55 °C to +125 °C), SOD882T ultra-small leadless package footprint, and verified capacitance linearity across VHF bands.
Technical Context
The BB181LX,315 operates as a reverse-biased junction varactor, where applied DC voltage modulates depletion-layer width to tune capacitance continuously. Its planar silicon structure ensures stable CV characteristics with low series resistance and minimal temperature drift.
It delivers specified capacitance values at 1 MHz and 470 MHz test frequencies, with maximum reverse current of 10 nA at 30 V and 25 °C, and 200 nA at 30 V and 85 °C - enabling reliable operation in thermally demanding VHF signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd @ 28 V | 1.055 pF typical - sets minimum oscillator tank capacitance for VHF frequency ceiling |
| Cd @ 0.5 V | 12.5 pF typical (midpoint of 8–17 pF min–max) - defines maximum tunable capacitance range |
| Cd Ratio (0.5 V / 28 V) | 14:1 typical (12–16 range) - enables wide VHF tuning bandwidth in compact VCO designs |
| rs @ 470 MHz | 2.0 Ω typical - minimizes Q degradation and phase noise in resonant circuits |
| Max Reverse Voltage | 32 V - supports robust bias margin above typical 28 V tuning rails |
| Junction Temp Range | −55 °C to +125 °C - qualified for industrial and satellite tuner thermal environments |
Pinout & Package
BB181LX,315 is housed in the SOD882T leadless ultra-small plastic SMD package (1.0 × 0.6 × 0.4 mm body), with cathode identified by a marking bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | DC reverse bias connection; polarity-sensitive terminal requiring correct PCB layout orientation |
| 2 | Anode | AC ground reference point in VCO tank circuits; connects to RF ground plane or inductor tap |
Key Features
| Feature | Design Value |
|---|---|
| Excellent capacitance linearity | Verified CV curve monotonicity and low harmonic distortion in VCO tuning sweeps |
| Ultra-small SOD882T package | 0.6 mm width enables high-density RF layout in space-constrained satellite tuner modules |
| 14:1 capacitance ratio | Supports >10 % fractional bandwidth tuning without switching banks or auxiliary components |
| Low 2.0 Ω series resistance | Maintains tank circuit Q >100 at 150 MHz, directly limiting phase noise floor in local oscillators |
Applications
| Voltage-Controlled Oscillator (VCO) | Satellite Tuner Front-End |
|---|---|
Use Scenario: Tuning element in monolithic VHF VCOs for broadcast receivers and wireless microphones. IC Role / Device Role / Timing Role: Varactor diode providing voltage-dependent reactance to shift resonant frequency of LC tank. Use Value: 14:1 C-ratio and 2.0 Ω rs enable <±10 kHz phase noise at 100 kHz offset in 100–200 MHz designs. | Use Scenario: Fine-tuning stage in LNB (Low-Noise Block) downconverters for Ku-band satellite TV reception. IC Role / Device Role / Timing Role: Capacitance-adjustable coupling element between RF amplifier and mixer input. Use Value: 1.055 pF @ 28 V allows precise impedance matching across 950–2150 MHz IF band with minimal insertion loss. |
| Tunable Coupling Network | RF Filter Calibration |
Use Scenario: Adjustable inter-stage coupling in multi-band VHF/UHF transceivers. IC Role / Device Role / Timing Role: Bias-controlled capacitive divider enabling dynamic gain and bandwidth control. Use Value: Linear CV response ensures monotonic coupling coefficient adjustment without mode hopping. | Use Scenario: Factory-trimmed capacitance element in bandpass filters for IoT base stations. IC Role / Device Role / Timing Role: Post-silicon calibration node replacing fixed trim caps in production test flow. Use Value: SOD882T footprint allows automated laser trimming setup integration without board redesign. |
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(0.5 V) = 25 pF; lower C-ratio = 10:1; SOD323 package (1.7 × 1.3 mm) | Better for UHF tuning below 1 GHz; less suitable for narrowband VHF VCOs requiring high ratio | Select BBY52,115 when wider absolute capacitance range outweighs ratio and size constraints |
| SMV1232-011 | Lower rs = 1.3 Ω; tighter C-ratio tolerance (13.5–14.5); SOD-523 package (1.2 × 0.8 mm) | Optimized for low-phase-noise 5G FR1 tuners; higher cost and narrower VHF linearity spec | Choose SMV1232-011 only if sub-1.5 Ω rs and ±0.25 pF Cd tolerance are design-critical |
Compared with BBY52,115 and SMV1232-011, BB181LX,315 uniquely balances ultra-compact SOD882T size, 14:1 ratio, and proven VHF linearity - making it optimal for space-limited satellite tuner VCOs where ratio and layout density dominate over absolute C-range or sub-Ω rs.
Availability
BB181LX,315 is available at Aetrix Electronics and suitable for satellite tuners, VHF radio transceivers, and RF filter calibration systems requiring stable component supply and consistent parametric performance across production lots.
Supply support for BB181LX,315 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 consumer applications.
The BB181LX,315 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, miniaturized VHF tuning in broadcast and satellite receiver systems.
FAQ
What is the maximum reverse voltage rating for BB181LX,315?
The BB181LX,315 has an absolute maximum reverse voltage rating of 32 V, per IEC 60134 limiting values. Operation beyond this voltage risks permanent junction damage. The device is typically biased between 0.5 V and 28 V to achieve its specified capacitance range, leaving a 4 V safety margin below the absolute limit.
How does the SOD882T package of BB181LX,315 impact PCB layout?
The SOD882T package of BB181LX,315 measures 1.0 × 0.6 × 0.4 mm with no leads, requiring precise stencil aperture design and reflow profile control. Its cathode-marked top surface must align with silkscreen polarity indicators, and thermal pads are not present - so thermal relief is managed via copper area under the body and adjacent ground planes.
What is the typical capacitance ratio (Cd(0.5 V)/Cd(28 V)) for BB181LX,315?
The BB181LX,315 exhibits a typical capacitance ratio of 14:1, with a guaranteed range of 12:1 to 16:1 at 1 MHz and 25 °C. This ratio is measured between 0.5 V and 28 V reverse bias and directly determines the achievable frequency tuning range in VCO applications without additional switching elements.
Is BB181LX,315 suitable for use at 470 MHz?
Yes, BB181LX,315 is characterized at 470 MHz for series resistance (rs = 2.0 Ω typical), confirming its suitability for VHF applications up to at least 500 MHz. Its capacitance values remain stable across this band, and the low rs preserves Q-factor in resonant circuits used in FM broadcast and land-mobile radio front-ends.
What marking code identifies BB181LX,315 on the device body?
The BB181LX,315 is marked with the code "L6" on its top surface, per NXP's marking specification. This two-character code is laser-etched or printed adjacent to the cathode bar and serves as the primary visual identifier for traceability and counterfeit detection during incoming inspection.
BB181LX,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 1.055pF @ 28V, 1MHz
- Capacitance Ratio:
- 16.0
- Capacitance Ratio Condition:
- C0.5/C28
- Voltage - Peak Reverse (Max):
- 32 V
- Diode Type:
- Single
- Q @ Vr, F:
- -
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD2
BB181LX,315 FAQ
1.How can I place an order for BB181LX,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB181LX,315 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 BB181LX,315 reliable?
The price and inventory of BB181LX,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB181LX,315 is usually 5 days.
3.What payment methods are accepted for BB181LX,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB181LX,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB181LX,315?
BB181LX,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB181LX,315 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 BB181LX,315?
For technical support, including BB181LX,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB181LX,315 requirements.
6.How does Aetrix verify that BB181LX,315 is sourced from the original manufacturer or authorized distributors?
All BB181LX,315 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 BB181LX,315 meets industry standards.
7.What is the process for return or replacement of BB181LX,315?
All BB181LX,315 units undergo pre-shipment inspection (PSI). If there is an issue with BB181LX,315, 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 BB181LX,315 part is unused and in its original packaging.
Return procedure for BB181LX,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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