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NXP Semiconductors BB179B,335
- Part No.:
- BB179B,335
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB179B,335.pdf
- Description:
- DIODE UHF VAR CAP 32V SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,895
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Product details
Overview
BB179B,335 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 <2 % capacitance matching across sequences via Direct Matching Assembly (DMA), enabling precise tuning in high-frequency oscillator circuits.
For engineers reviewing the BB179B,335 datasheet, BB179B,335 pinout, BB179B,335 application, or BB179B,335 equivalent, key selection criteria include reverse voltage range (32 V max), series resistance (0.6–0.75 Ω at 470 MHz), temperature-stable capacitance characteristics, and ultra-compact SOD523 footprint for space-constrained UHF front-end designs.
Technical Context
The BB179B,335 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 linearity and low series resistance support stable frequency pulling in VCOs up to UHF bands.
Capacitance matching is achieved through gliding matching and DMA processing-ensuring ≤2 % variation across 10-diode sequences-while its SOD523 package maintains thermal stability over −55 °C to +125 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 1 V | 18.22–20 pF - sets minimum oscillation frequency in VCO tank circuits |
| Capacitance @ 28 V | 1.9–2.25 pF - defines maximum oscillation frequency and tuning range |
| Capacitance Ratio (1V/28V) | 8.45–10 - determines usable frequency tuning bandwidth in UHF tuners |
| Series Resistance (rs) | 0.6–0.75 Ω @ 470 MHz - minimizes Q-factor degradation and phase noise in resonant circuits |
| Max Reverse Voltage (VR) | 32 V - establishes safe DC bias headroom for stable varactor operation |
| Capacitance Matching | ≤2 % over 10-diode sequence - enables matched-pair use in differential VCO topologies |
| Junction Temp Range | −55 °C to +125 °C - supports reliable operation in consumer and industrial UHF modules |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.25 mm × 0.85 mm × 0.58 mm body, 2-terminal configuration, cathode indicated by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Reverse-bias terminal; connects to tuning voltage reference (e.g., ground or fixed bias node) |
| 2 | Anode | AC-coupled node in tank circuit; carries RF signal while blocking DC bias current |
Key Features
| Feature | Design Value |
|---|---|
| Direct Matching Assembly (DMA) | Enables ≤2 % capacitance matching across production lots for differential VCO calibration |
| Ultra-low series resistance | 0.6–0.75 Ω at 470 MHz preserves tank circuit Q and reduces VCO phase noise |
| High capacitance ratio | 9:1 (1V/28V) provides wide frequency tuning range without external switching |
| SOD523 footprint | 1.25 mm × 0.85 mm area allows dense placement in UHF TV tuner modules and compact RF front-ends |
| Low leakage current | ≤10 nA @ 30 V reverse bias ensures stable DC bias point and minimal drift in tuning voltage |
Applications
| UHF Television Tuners | Voltage-Controlled Oscillators |
|---|---|
Use Scenario: Channel selection and fine-tuning in analog/digital terrestrial TV receivers operating at 470–862 MHz. IC Role / Device Role / Timing Role: Varactor diode providing voltage-dependent capacitance in LC tank circuit of tuner's local oscillator. Use Value: 9:1 capacitance ratio and ≤2 % matching enable accurate, repeatable channel lock without manual alignment. |
Use Scenario: Frequency synthesis in wireless microphones, remote controls, and ISM-band transceivers. IC Role / Device Role / Timing Role: Tuning element in Colpitts or Clapp oscillator topology, modulated by control voltage. Use Value: Low rs (0.6–0.75 Ω) sustains high tank Q, reducing close-in phase noise critical for narrowband modulation. |
| RF Front-End Filters | Differential Tuning Circuits |
Use Scenario: Adjustable bandpass filtering in UHF RFID readers and smart meter RF interfaces. IC Role / Device Role / Timing Role: Capacitance-adjustable shunt element in switched-capacitor filter banks. Use Value: Stable Cd vs. VR curve (Figure 1) ensures predictable center frequency shift across temperature (−40 °C to +85 °C). |
Use Scenario: Symmetric frequency tuning in quadrature VCOs and I/Q modulator LO paths. IC Role / Device Role / Timing Role: Matched pair (gliding-matched) BB179B,335 diodes used in push-pull varactor configuration. Use Value: ≤2 % capacitance matching across 10-diode sequences enables sub-degree phase error in quadrature generation. |
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) = 25 pF; lower ratio = 6.5; SOD323 package (larger footprint) | Better for lower-UHF (300–500 MHz); less suitable for 700+ MHz due to reduced tuning range | Select when wider absolute capacitance range needed at lower frequencies; verify PCB pad compatibility with SOD323 |
| SMV1232-011 | Higher VR = 30 V; Cd(1V)/Cd(28V) = 10.5; 0.5 Ω rs; SC-70 package (1.25 × 0.85 mm same outline but different leadform) | Optimized for 2.4 GHz ISM VCOs; tighter tolerance on TCd (temperature coefficient) | Prefer for 2.4 GHz+ designs requiring lower phase noise; requires validation of SC-70 solder profile vs. SOD523 |
Compared with BBY52,115 and SMV1232-011, the BB179B,335 offers the best combination of UHF-optimized capacitance ratio (9), ultra-compact SOD523 footprint, and production-grade matching for cost-sensitive TV tuner modules.
Availability
BB179B,335 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators, RF front-end filters, and differential tuning circuits requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for BB179B,335 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,335 belongs to NXP's RF discrete portfolio, designed specifically for high-linearity, high-stability varactor operation in UHF broadcast and wireless infrastructure systems.
FAQ
What is the primary function of the BB179B,335 in RF circuits?
The BB179B,335 functions as a voltage-controlled variable capacitance diode (varactor), used to tune resonant frequency in UHF oscillator and filter circuits. Its capacitance changes predictably with applied reverse voltage-18.22 pF at 1 V decreasing to 2.1 pF at 28 V-enabling precise electronic frequency adjustment without mechanical components. This behavior is central to the BB179B,335's role in TV tuners and VCOs.
Does the BB179B,335 support differential tuning configurations?
Yes-the BB179B,335 is qualified for differential use via gliding matching and Direct Matching Assembly (DMA), achieving ≤2 % capacitance variation across sequences of 10 diodes. This allows paired BB179B,335 units to maintain balanced tuning response in quadrature VCOs and I/Q LO paths, directly supporting the BB179B,335's deployment in high-fidelity RF signal generation.
What is the maximum reverse voltage rating for the BB179B,335?
The BB179B,335 has an absolute maximum reverse voltage (VR) rating of 32 V per IEC 60134, with a peak reverse voltage (VRM) of 35 V when used in series with a 10 kΩ resistor. Operating beyond 32 V risks permanent junction damage; design margin should keep DC bias ≤28 V to ensure reliable long-term performance of the BB179B,335.
How does the BB179B,335's series resistance affect VCO phase noise?
The BB179B,335's typical series resistance of 0.6–0.75 Ω at 470 MHz directly limits tank circuit Q-factor-lower rs yields higher Q, which suppresses close-in phase noise. In VCO designs, this rs value enables measurable improvement in Leeson-model phase noise floor compared to varactors with >1 Ω rs, making the BB179B,335 especially effective where spectral purity is critical.
Is the BB179B,335 automotive-qualified?
No-the BB179B,335 is not automotive-qualified. Per NXP's legal disclaimers, it is neither tested nor warranted for automotive use, including under AEC-Q200 stress conditions. For automotive applications, users must perform full qualification independently; the BB179B,335 remains intended for consumer UHF tuners and industrial RF modules where automotive reliability standards do not apply.
BB179B,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:
- 2.25pF @ 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,335 FAQ
1.How can I place an order for BB179B,335 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB179B,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 BB179B,335 reliable?
The price and inventory of BB179B,335 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB179B,335 is usually 5 days.
3.What payment methods are accepted for BB179B,335?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB179B,335 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB179B,335?
BB179B,335 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB179B,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 BB179B,335?
For technical support, including BB179B,335 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB179B,335 requirements.
6.How does Aetrix verify that BB179B,335 is sourced from the original manufacturer or authorized distributors?
All BB179B,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 BB179B,335 meets industry standards.
7.What is the process for return or replacement of BB179B,335?
All BB179B,335 units undergo pre-shipment inspection (PSI). If there is an issue with BB179B,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 BB179B,335 part is unused and in its original packaging.
Return procedure for BB179B,335:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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