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NXP Semiconductors BB187,335
- Part No.:
- BB187,335
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB187,335.pdf
- Description:
- DIODE VHF VAR CAP 32V SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,140
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Product details
Overview
BB187 from NXP Semiconductors is a planar technology variable capacitance diode (varactor) designed for VHF tuning applications, featuring 2.75 pF capacitance at 25 V reverse bias, 11:1 minimum capacitance ratio (Cd(2V)/Cd(25V)), and 2 % gliding matching accuracy via Direct Matching Assembly (DMA). It operates in ultra-small SOD523 (SC-79) package with low series resistance (0.75 Ω at 470 MHz, 5 V).
For engineers reviewing the BB187 datasheet, BB187 pinout, BB187 application, or BB187 equivalent, this varactor is selected for high-linearity voltage-controlled oscillators and VHF TV tuner circuits where tight capacitance matching, stable temperature coefficient, and minimal parasitic resistance are critical.
Technical Context
The BB187 uses planar silicon junction technology to achieve predictable C-V characteristics across 2–25 V reverse bias, with typical capacitance ranging from 29.3 pF at 2 V to 2.75 pF at 25 V. Its Cd(2V)/Cd(25V) ≥ 11 ratio enables wide tuning range in compact VCO designs.
Designed for gliding matching in sequences of 10 diodes, the BB187 achieves ≤ 2 % capacitance variation under matched-pair conditions. Its low rs (0.75 Ω @ 470 MHz, VR = 5 V) minimizes Q-factor degradation in resonant tank circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 25 V | 2.75 pF - sets minimum tank capacitance for high-frequency VCO operation |
| Capacitance @ 2 V | 29.3–34.2 pF - defines maximum tuning capacitance for VHF band coverage |
| Capacitance Ratio | ≥11 - enables >1.5× frequency tuning range in LC oscillator designs |
| Series Resistance | 0.75 Ω @ 470 MHz - preserves Q > 100 in 50–200 MHz resonant circuits |
| Reverse Voltage Limit | 32 V - supports robust bias margin in tunable filter and VCO control lines |
| Matching Accuracy | ≤2 % (gliding DMA) - ensures consistent frequency step linearity in multi-diode tuner arrays |
| Package | SOD523 (SC-79) - 1.25 × 0.85 mm footprint for space-constrained RF modules |
Pinout & Package
SOD523 (SC-79) ultra-small plastic surface-mount package with 2 leads; cathode indicated by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to reverse bias control voltage; polarity-sensitive for proper varactor operation |
| 2 | Anode | Common node for RF signal path; grounded or AC-coupled in most VCO tank configurations |
Key Features
| Feature | Design Value |
|---|---|
| High linearity | C-V curve optimized for <±5 % deviation across 2–25 V, reducing harmonic distortion in tuning loops |
| Excellent matching | ≤2 % capacitance spread in gliding DMA sequences-enables precise multi-stage VHF tuner calibration |
| Ultra small SMD package | SOD523 footprint (1.25 × 0.85 mm) allows placement adjacent to RF inductors without layout congestion |
| Low series resistance | 0.75 Ω at 470 MHz maintains tank circuit Q-factor above 100 for stable oscillation |
| Wide capacitance ratio | ≥11:1 enables full VHF band (30–300 MHz) coverage with single-diode tuning in compact designs |
Applications
| VHF Television Tuners | Voltage-Controlled Oscillators (VCOs) |
|---|---|
Use Scenario: Channel selection in analog/digital terrestrial TV receivers operating in 47–862 MHz bands. IC Role / Device Role / Timing Role: Varactor diode providing voltage-dependent capacitance for resonant LC tank tuning. Use Value: 2 % DMA matching ensures consistent channel spacing and reduced image interference across tuner modules. |
Use Scenario: Local oscillator generation in RF transceivers for cordless phones and ISM-band devices. IC Role / Device Role / Timing Role: Tuning element in Colpitts or Clapp oscillator topologies. Use Value: ≥11 capacitance ratio supports >100 MHz tuning bandwidth while maintaining phase noise < −100 dBc/Hz @ 100 kHz offset. |
| FM Radio Front-Ends | RF Filter Tuning Circuits |
Use Scenario: Frequency alignment of IF and RF filters in portable FM radio ICs. IC Role / Device Role / Timing Role: Bias-controlled capacitance shunt for center-frequency trimming. Use Value: Low 0.75 Ω series resistance prevents insertion loss degradation in 88–108 MHz bandpass networks. |
Use Scenario: Adaptive impedance matching in reconfigurable front-end filters for multi-band receivers. IC Role / Device Role / Timing Role: Variable capacitor in switched-capacitor or continuous-tuning filter banks. Use Value: Tight 2 % matching enables repeatable filter response shift across production units without per-unit calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BB204,315 | Higher capacitance (33 pF @ 2 V), lower ratio (≥8), same SOD523 package | Better suited for UHF tuning; less suitable for wide-range VHF VCOs requiring >10:1 ratio | Select BB204,315 when wider absolute capacitance range is needed over narrower frequency span |
| SMV1232-011LF | 0.5 pF min capacitance, 15:1 ratio, SOD-323 package, higher Q | Optimized for 800–2500 MHz; not validated for VHF TV tuner matching performance | Choose SMV1232-011LF only for high-frequency VCOs where VHF matching tolerance is not required |
Compared with BB187, BB204,315 offers greater low-voltage capacitance but sacrifices tuning range linearity, while SMV1232-011LF delivers superior high-frequency Q but lacks the DMA-matched consistency essential for broadcast tuner production calibration.
Availability
BB187 is available at Aetrix Electronics and suitable for VHF television tuners, voltage-controlled oscillators, FM radio front-ends, and RF filter tuning circuits requiring stable component supply and matched varactor performance.
Supply support for BB187 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 BB187 belongs to NXP's RF varactor diode product line, engineered specifically for high-precision electronic tuning in broadcast and communications equipment where matching accuracy and VHF stability are critical.
FAQ
What is the primary function of the BB187 in RF circuits?
The BB187 functions as a voltage-controlled variable capacitance diode (varactor), used to tune resonant frequencies in VHF oscillators and filters. Its capacitance changes predictably with applied reverse bias voltage, enabling precise electronic frequency adjustment. The BB187 is especially valued for its 2 % gliding matching accuracy and ≥11 capacitance ratio, making it ideal for production-grade VHF TV tuners and stable VCOs where repeatability matters.
Does the BB187 support operation beyond 25 V reverse bias?
No-the BB187 has an absolute maximum reverse voltage rating of 32 V, but its specified capacitance characteristics (including Cd(25V) = 2.75 pF) are guaranteed only up to 25 V. Operating above 25 V may cause parametric drift or accelerated aging. For reliable design, the BB187 should be biased within 2–25 V to maintain linearity, matching, and long-term stability as documented in its NXP datasheet Rev. 5.
How is the cathode identified on the BB187 package?
The cathode of the BB187 is marked by a visible bar on the top surface of the SOD523 (SC-79) package. Pin 1 (cathode) is located at the marked end, and Pin 2 (anode) is the opposite terminal. This marking aligns with standard diode polarity conventions and must be observed during PCB layout to ensure correct reverse-bias operation of the BB187 in tuning circuits.
Can the BB187 be used in automotive applications?
No-the BB187 is not automotive-qualified. Per NXP's legal disclaimers, unless explicitly stated in the datasheet, non-automotive qualified products like the BB187 are neither tested nor warranted for use in safety-critical or life-support systems. Its qualification covers commercial and industrial environments only; automotive deployment requires formal AEC-Q200 validation, which the BB187 does not possess.
What is the significance of the "Direct Matching Assembly (DMA)" process for the BB187?
The Direct Matching Assembly (DMA) process enables BB187 diodes to achieve ≤2 % capacitance variation when grouped in sequences of 10 units-a capability critical for mass-produced VHF tuners requiring consistent channel spacing. Unlike statistical binning, DMA uses active gliding matching during assembly, ensuring matched pairs retain tight correlation across the full 2–25 V bias range. This makes the BB187 uniquely suitable for high-yield broadcast receiver manufacturing.
BB187,335 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 2.92pF @ 25V, 1MHz
- Capacitance Ratio:
- 11.0
- Capacitance Ratio Condition:
- C2/C25
- 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:
- SOD-523
BB187,335 FAQ
1.How can I place an order for BB187,335 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB187,335 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 BB187,335 reliable?
The price and inventory of BB187,335 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB187,335 is usually 5 days.
3.What payment methods are accepted for BB187,335?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB187,335 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB187,335?
BB187,335 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB187,335 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 BB187,335?
For technical support, including BB187,335 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB187,335 requirements.
6.How does Aetrix verify that BB187,335 is sourced from the original manufacturer or authorized distributors?
All BB187,335 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 BB187,335 meets industry standards.
7.What is the process for return or replacement of BB187,335?
All BB187,335 units undergo pre-shipment inspection (PSI). If there is an issue with BB187,335, 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 BB187,335 part is unused and in its original packaging.
Return procedure for BB187,335:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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