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NXP Semiconductors BB179B,135
- Part No.:
- BB179B,135
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB179B,135.pdf
- Description:
- DIODE UHF VAR CAP 32V SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
BB179B,135 from NXP Semiconductors is a UHF variable capacitance diode (varactor) fabricated in planar technology and housed in an SOD523 (SC-79) ultra-small SMD package. It delivers 2.1 pF capacitance at 28 V reverse bias, a Cd(1V)/Cd(28V) ratio of 9, and <0.75 Ω series resistance at 470 MHz - enabling precise electronic tuning in high-frequency oscillator circuits.
For engineers reviewing the BB179B,135 datasheet, BB179B,135 pinout, BB179B,135 application, or BB179B,135 equivalent, key selection criteria include reverse voltage range (up to 32 V), capacitance matching tolerance (≤2 % via DMA), temperature-stable C-V characteristics, and ultra-compact footprint for space-constrained UHF front-end designs.
Technical Context
The BB179B,135 operates as a voltage-controlled capacitor in reverse-biased mode, with capacitance varying from 18.22 pF at 1 V to 2.1 pF at 28 V. Its C-V curve exhibits high linearity and low temperature coefficient across 0 °C to 85 °C, supported by gliding matching and Direct Matching Assembly (DMA) for consistent pair-to-pair performance.
Designed for RF tuning applications, it features low series resistance (0.6–0.75 Ω @ 470 MHz) and minimal reverse leakage (<10 nA @ 30 V, 25 °C), ensuring low phase noise and high Q-factor in VCO tank circuits operating up to UHF bands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 1 V | 18.22–20 pF - sets minimum VCO tuning range and low-end frequency limit |
| Capacitance @ 28 V | 1.9–2.25 pF - defines maximum oscillation frequency and tuning bandwidth |
| Capacitance Ratio (1V/28V) | 8.45–10 - determines total frequency tuning range in VCO designs |
| Series Resistance @ 470 MHz | 0.6–0.75 Ω - directly impacts tank circuit Q and phase noise performance |
| Reverse Voltage Rating | 32 V DC - establishes safe bias headroom for stable varactor operation |
| Capacitance Matching | ≤2 % over 10-diode sequence - enables matched pairs for differential VCOs |
| Package | SOD523 (SC-79) - 1.25 × 0.85 mm footprint for ultra-dense RF layouts |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package with 2 leads; cathode indicated by marking bar on device top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to RF ground or bias network return; polarity critical for correct C-V behavior |
| 2 | Anode | Applied reverse bias voltage; forms tunable capacitor node in LC tank or filter |
Key Features
| Feature | Design Value |
|---|---|
| Direct Matching Assembly (DMA) | Enables ≤2 % capacitance matching across diode sequences for balanced VCO topologies |
| Ultra-low series resistance | 0.6–0.75 Ω at 470 MHz ensures high Q-factor and low phase noise in resonant circuits |
| High C-V linearity | Controlled doping profile yields predictable, monotonic capacitance vs. voltage response |
| Temperature-stable C-V curve | Low temperature coefficient supports stable tuning across −55 °C to +125 °C junction range |
| UHF-optimized construction | Planar die and SOD523 package minimize parasitic inductance for operation beyond 500 MHz |
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 capacitance in YIG-less tuner front-end LC filters. Use Value: Enables precise, low-distortion channel filtering with 9:1 capacitance ratio and matched pairs for image rejection. |
Use Scenario: Local oscillator generation in wireless transceivers and spectrum analyzers requiring wide tuning range. IC Role / Device Role / Timing Role: Core tuning element in Colpitts or Clapp oscillator tank networks. Use Value: Delivers low-phase-noise output via 0.75 Ω series resistance and stable C-V linearity across supply voltage variations. |
| RF Front-End Filters | Frequency Synthesizer Tuning |
Use Scenario: Reconfigurable bandpass/bandstop filtering in software-defined radio (SDR) front ends. IC Role / Device Role / Timing Role: Voltage-variable capacitor adjusting center frequency and bandwidth of passive LC filters. Use Value: Supports real-time reconfiguration with ≤2 % matching between dual diodes for symmetric filter response. |
Use Scenario: Fine-tuning element in PLL-based synthesizers for cellular base stations and test equipment. IC Role / Device Role / Timing Role: Secondary varactor in multi-stage VCO for fractional-N loop stability and spurious suppression. Use Value: Provides predictable 8.45–10:1 tuning ratio and low leakage (<10 nA) to maintain loop lock integrity over temperature. |
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 capacitance (25 pF @ 1 V), lower ratio (6.5:1), same SOD523 package | Better suited for VHF/mid-band tuning; reduced UHF upper-frequency margin | Select when wider low-end capacitance is needed and tuning range >500 MHz is not required |
| SMV1232-011 | 0.5 pF @ 28 V, 12:1 ratio, 0.5 Ω rs, SC-79 but different pin orientation (anode-marked) | Enables extended UHF tuning; requires PCB layout revision due to reversed pinout | Choose for higher-frequency VCOs where 12:1 ratio and sub-0.6 Ω rs justify redesign effort |
Compared with BB179B,135, BBY52,115 offers greater low-voltage capacitance but sacrifices UHF bandwidth and matching precision, while SMV1232-011 extends tuning range and lowers loss at the cost of pinout compatibility and tighter bias control requirements.
Availability
BB179B,135 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators, RF front-end filters, and frequency synthesizer tuning requiring stable component supply and tight parametric consistency.
Supply support for BB179B,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 applications.
The BB179B,135 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, low-loss voltage-controlled tuning in UHF communication systems and broadcast receivers.
FAQ
What is the maximum reverse voltage rating for BB179B,135?
The BB179B,135 has an absolute maximum reverse voltage rating of 32 V DC, with a peak reverse voltage of 35 V when used in series with a 10 kΩ resistor. Exceeding 32 V risks permanent degradation of the junction; design should maintain ≥20 % derating margin for long-term reliability in BB179B,135 applications.
How is capacitance matching achieved in BB179B,135?
BB179B,135 achieves ≤2 % capacitance matching across sequential units using gliding matching and Direct Matching Assembly (DMA) - a factory calibration process that groups diodes by measured C-V curves. This ensures consistent performance in differential VCOs and balanced filter designs where BB179B,135 pairs are deployed.
Does BB179B,135 support operation above 1 GHz?
No - the BB179B,135 is characterized up to 470 MHz for series resistance and specified for UHF television tuners (470–862 MHz). While usable in some 900 MHz designs, its 0.75 Ω rs and parasitic limits reduce Q-factor above 1 GHz; for >1 GHz VCOs, consider BB179B,135 alternatives like SMV1232-011 explicitly rated to 2.5 GHz.
What does the 'C' marking on BB179B,135 indicate?
The 'C' laser marking on the BB179B,135 top surface identifies the cathode terminal, aligning with Pin 1 per the official pinning diagram. This marking bar must be oriented toward the circuit ground or bias return path to ensure correct reverse-bias operation and avoid forward conduction in BB179B,135 implementations.
Is BB179B,135 suitable for automotive applications?
No - the BB179B,135 is not automotive-qualified. NXP explicitly states in its datasheet that unless otherwise specified, products like BB179B,135 are not tested or warranted for automotive use. For automotive-grade varactors, designers must select components with AEC-Q200 qualification and validated performance across −40 °C to +125 °C.
BB179B,135 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:
- 2.25pF @ 28V, 1MHz
- Capacitance Ratio:
- 10.0
- Capacitance Ratio Condition:
- C1/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:
- SOD-523
BB179B,135 FAQ
1.How can I place an order for BB179B,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB179B,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 BB179B,135 reliable?
The price and inventory of BB179B,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB179B,135 is usually 5 days.
3.What payment methods are accepted for BB179B,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB179B,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB179B,135?
BB179B,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB179B,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 BB179B,135?
For technical support, including BB179B,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB179B,135 requirements.
6.How does Aetrix verify that BB179B,135 is sourced from the original manufacturer or authorized distributors?
All BB179B,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 BB179B,135 meets industry standards.
7.What is the process for return or replacement of BB179B,135?
All BB179B,135 units undergo pre-shipment inspection (PSI). If there is an issue with BB179B,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 BB179B,135 part is unused and in its original packaging.
Return procedure for BB179B,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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