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NXP Semiconductors BB149A,135
- Part No.:
- BB149A,135
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-76, SOD-323
- Datasheet:
-
BB149A,135.pdf
- Description:
- DIODE UHF VAR CAP 30V SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,138
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Product details
Overview
BB149A,135 from NXP Semiconductors is a UHF variable capacitance diode (varactor) fabricated in planar technology and housed in an SOD323 (SC-76) surface-mount package. It delivers 2.1 pF capacitance at 28 V reverse bias, a Cd(1V)/Cd(28V) ratio of 9, and 2 % gliding matching accuracy for precision tuning circuits in high-frequency RF systems.
For engineers reviewing the BB149A,135 datasheet, BB149A,135 pinout, BB149A,135 application, or BB149A,135 equivalent, this varactor is selected for UHF television tuners and voltage-controlled oscillators where tight capacitance matching, low series resistance (0.6–0.75 Ω at 470 MHz), and stable temperature coefficient are critical design requirements.
Technical Context
The BB149A,135 operates as a reverse-biased junction capacitor with voltage-dependent depletion-layer width. Its capacitance varies from 18.22–21.26 pF at 1 V to 1.951–2.225 pF at 28 V, enabling fine frequency control in resonant tank circuits.
It employs Direct Matching Assembly (DMA) and gliding matching to achieve ≤2 % capacitance variation across sequences of 10 diodes, supporting high-yield production of matched VCO pairs without post-assembly trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd @ 28 V | 2.1 pF typical - sets minimum tank capacitance for VCO upper frequency limit |
| Cd @ 1 V | 20.0 pF typical - establishes maximum tank capacitance for VCO lower frequency limit |
| Cd(1V)/Cd(28V) ratio | 9 typical - determines VCO tuning range bandwidth |
| Series resistance rs | 0.6–0.75 Ω at 470 MHz - limits Q-factor degradation and phase noise in oscillator loops |
| Reverse voltage VR max | 30 V - defines safe DC bias headroom before leakage or breakdown |
| Capacitance matching | ≤2 % over 10-diode sequence - enables factory-matched VCO core pairs without calibration |
| Package | SOD323 (SC-76) - 1.35 × 0.8 mm footprint supports high-density UHF PCB layouts |
Pinout & Package
BB149A,135 uses the SOD323 (SC-76) plastic surface-mount package: 1.35 mm × 0.8 mm body, 0.45 mm lead pitch, cathode indicated by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to DC bias supply rail; polarity must be observed to maintain reverse bias |
| 2 | Anode | Connected to RF ground or resonant node; forms variable capacitive branch with cathode |
Key Features
| Feature | Design Value |
|---|---|
| Capacitance linearity | Optimized for monotonic C-V curve across 1–28 V, reducing harmonic distortion in tuning applications |
| Gliding matching accuracy | ≤2 % capacitance deviation across 10-unit sequences - eliminates need for binning or manual matching |
| Low series resistance | 0.6–0.75 Ω at 470 MHz - preserves tank circuit Q > 100 in UHF VCO designs |
| Small outline package | SOD323 footprint minimizes parasitic inductance and layout area in compact tuner modules |
Applications
| UHF Television Tuners | Voltage-Controlled Oscillators (VCOs) |
|---|---|
Use Scenario: Channel selection in analog/digital terrestrial TV receivers operating in 470–862 MHz band. IC Role / Device Role / Timing Role: Varactor diode providing voltage-tuned resonant capacitance in LC tank circuits of tuner front-end filters and local oscillators. Use Value: 9:1 capacitance ratio enables full-band coverage with single VCO core; 2 % matching ensures consistent channel lock time across production units. | Use Scenario: Frequency synthesis in wireless transceivers requiring low-phase-noise, wide-tuning-range oscillators. IC Role / Device Role / Timing Role: Tuning element in Colpitts or Clapp oscillator topologies, where reverse bias voltage controls output frequency. Use Value: Low 0.6–0.75 Ω series resistance maintains high tank Q, directly improving phase noise performance below −110 dBc/Hz at 100 kHz offset. |
| FM Radio Receivers | RF Test Equipment Calibration |
Use Scenario: Local oscillator tuning in portable FM radios (87.5–108 MHz). IC Role / Device Role / Timing Role: Voltage-variable capacitor in PLL-based synthesizer loop filter and VCO tank network. Use Value: Stable 25 °C capacitance temperature coefficient (see Fig 3) reduces drift-induced tuning error over operating temperature range. | Use Scenario: Precision frequency calibration standards in lab-grade signal generators and spectrum analyzers. IC Role / Device Role / Timing Role: Reference varactor in traceable tuning modules used to validate oscillator linearity and settling behavior. Use Value: Factory-matched 2 % tolerance allows direct substitution across calibration units without individual characterization. |
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; Cd(28V) = 2.5 pF; ratio = 10.8; rs = 0.8 Ω | Better low-frequency tuning range but higher series resistance degrades UHF Q | Prefer BBY52,115 only when extended sub-UHF coverage (e.g., VHF FM) is required |
| SMV1232-011 | Lower Cd(1V) = 12.5 pF; Cd(28V) = 1.4 pF; ratio = 8.9; rs = 0.5 Ω; SOD-523 package | Tighter SOD-523 footprint but reduced capacitance range limits VCO span | Choose SMV1232-011 when board space is constrained and 8.9:1 ratio suffices for target frequency plan |
Compared with BBY52,115 and SMV1232-011, the BB149A,135 offers optimal balance of UHF capacitance range (18–2 pF), low series resistance (0.6–0.75 Ω), and factory-matched 2 % tolerance-making it preferred for production-grade UHF tuners where yield, phase noise, and tuning linearity are jointly critical.
Availability
BB149A,135 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators, FM radio receivers, and RF test equipment calibration requiring stable component supply and matched parametric consistency.
Supply support for BB149A,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 consumer electronics.
The BB149A,135 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, high-matching-accuracy UHF tuning applications in broadcast and wireless infrastructure.
FAQ
What is the primary function of the BB149A,135 in RF circuits?
The BB149A,135 functions as a voltage-controlled variable capacitance diode (varactor), used to tune resonant frequencies in UHF oscillator and filter circuits. Its capacitance changes predictably with applied reverse bias voltage, enabling precise electronic frequency adjustment without mechanical components. The BB149A,135 achieves this with a 9:1 capacitance ratio and ≤2 % matching across production batches.
What is the maximum reverse voltage rating for the BB149A,135?
The BB149A,135 has a maximum continuous reverse voltage (VR) rating of 30 V and a peak reverse voltage (VRM) rating of 35 V when used with a 10 kΩ series resistor. Exceeding 30 V under DC bias risks permanent junction damage. The BB149A,135 must remain reverse-biased at all times during operation to avoid forward conduction and nonlinear distortion.
How does the BB149A,135 achieve its 2 % capacitance matching specification?
The BB149A,135 achieves ≤2 % capacitance matching through a combination of gliding matching during wafer processing and Direct Matching Assembly (DMA), where diodes are sorted and paired based on measured C-V curves before packaging. This ensures matched pairs maintain consistent tuning characteristics across temperature and bias in VCO cores. The BB149A,135 is tested per sequence-of-10 criteria per datasheet Table 5.
What is the series resistance (rs) of the BB149A,135 and why does it matter?
The BB149A,135 exhibits a typical series resistance (rs) of 0.6–0.75 Ω at 470 MHz. This low value is critical because it directly impacts the quality factor (Q) of resonant tank circuits: higher rs lowers Q, increasing phase noise and reducing oscillator stability. The BB149A,135's rs specification ensures minimal degradation of VCO spectral purity in UHF applications.
Is the BB149A,135 suitable for automotive applications?
No, the BB149A,135 is not automotive-qualified. Per NXP's legal disclaimers, it is neither tested nor warranted for use in safety-critical, life-support, or automotive systems. The BB149A,135 is specified for commercial and industrial RF applications with operating junction temperatures from −55 °C to +125 °C, but lacks AEC-Q200 qualification or automotive-grade reliability screening.
BB149A,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:
- 2.225pF @ 28V, 1MHz
- Capacitance Ratio:
- 10.9
- Capacitance Ratio Condition:
- C1/C28
- Voltage - Peak Reverse (Max):
- 30 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
BB149A,135 FAQ
1.How can I place an order for BB149A,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB149A,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 BB149A,135 reliable?
The price and inventory of BB149A,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB149A,135 is usually 5 days.
3.What payment methods are accepted for BB149A,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB149A,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB149A,135?
BB149A,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB149A,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 BB149A,135?
For technical support, including BB149A,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB149A,135 requirements.
6.How does Aetrix verify that BB149A,135 is sourced from the original manufacturer or authorized distributors?
All BB149A,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 BB149A,135 meets industry standards.
7.What is the process for return or replacement of BB149A,135?
All BB149A,135 units undergo pre-shipment inspection (PSI). If there is an issue with BB149A,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 BB149A,135 part is unused and in its original packaging.
Return procedure for BB149A,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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