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NXP Semiconductors BB179B,315
- Part No.:
- BB179B,315
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB179B,315.pdf
- Description:
- DIODE UHF VAR CAP 32V SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
BB179B,315 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 9:1 capacitance ratio from 1 V to 28 V, and 2 % gliding matching accuracy via Direct Matching Assembly (DMA), enabling precise tuning in high-frequency oscillator circuits.
For engineers reviewing the BB179B,315 datasheet, BB179B,315 pinout, BB179B,315 application, or BB179B,315 equivalent, key selection criteria include reverse voltage rating (32 V), 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,315 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 across UHF bands.
Capacitance matching is achieved through gliding matching and DMA processing, ensuring ≤2 % variation across sequences of 10 diodes. Temperature coefficient of capacitance is characterized across 0 °C to 85 °C, with typical values provided per reverse voltage in Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance @ 1 V | 18.22–20 pF - sets minimum oscillation frequency and tuning range lower bound |
| Capacitance @ 28 V | 1.9–2.25 pF - defines maximum oscillation frequency and tuning range upper bound |
| Capacitance Ratio (1 V / 28 V) | 8.45–10 - determines usable tuning bandwidth in VCO and tuner applications |
| Series Resistance (rs) | 0.6–0.75 Ω @ 470 MHz - limits Q-factor degradation and phase noise in resonant tank circuits |
| Reverse Voltage Rating (VR) | 32 V - maximum DC bias voltage before parametric drift or breakdown risk |
| Matching Accuracy | ≤2 % over 10-diode sequence - enables predictable multi-varactor array behavior without individual calibration |
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 | Connected to higher DC bias potential in reverse-biased varactor operation; marking bar identifies this terminal |
| 2 | Anode | Connected to RF ground or AC signal reference; forms the low-impedance side of the junction capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitance linearity | Optimized for monotonic, predictable C–V response across 1–28 V, reducing harmonic distortion in tuning loops |
| Direct Matching Assembly (DMA) | Enables ≤2 % capacitance matching across production lots-critical for balanced filter or VCO arrays |
| Ultra-small SOD523 footprint | 0.85 mm × 1.25 mm outline allows placement in dense UHF RF layouts without compromising trace integrity |
| Low series resistance | 0.6–0.75 Ω at 470 MHz preserves tank circuit Q and minimizes VCO phase noise contribution |
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 LC resonator tanks of tuner front-ends. Use Value: 9:1 capacitance ratio and 2 % matching enable accurate, repeatable channel lock without manual alignment. |
Use Scenario: Frequency synthesis in wireless transceivers and spectrum analyzers requiring fine-resolution tuning. IC Role / Device Role / Timing Role: Core tuning element in Colpitts or Clapp oscillator topologies, modulated by PLL control voltage. Use Value: Low rs and stable C–V linearity reduce close-in phase noise and improve spectral purity under modulation. |
| FM Radio Front-Ends | RF Filter Tuning Modules |
|
Use Scenario: Local oscillator generation in 87.5–108 MHz FM broadcast receivers. IC Role / Device Role / Timing Role: Bias-controlled capacitance element adjusting resonant frequency of LC tank in LO path. Use Value: 32 V VR rating supports wide tuning voltage range (0–28 V), accommodating diverse IF/LO architectures. |
Use Scenario: Adaptive bandpass filtering in software-defined radio (SDR) and multi-band base stations. IC Role / Device Role / Timing Role: Tuning capacitor in switched-capacitor or active-filter banks for dynamic center-frequency adjustment. Use Value: Gliding matching ensures consistent group delay and insertion loss across tuned filter channels. |
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), SOD-323 package (larger footprint) | Better suited for VHF tuning; less ideal for UHF due to reduced ratio and higher parasitic inductance | Select when wider absolute capacitance range is needed at lower frequencies and board space permits larger SOD-323 |
| SMV1232-011 | Lower series resistance (0.4 Ω), tighter matching (±1.5 %), same SOD-523 package | Designed specifically for cellular infrastructure VCOs; higher cost and longer lead time than BB179B,315 | Choose for mission-critical phase-noise-sensitive applications where 0.2 Ω rs reduction justifies premium sourcing |
Compared with BB179B,315, BBY52,115 offers greater low-voltage capacitance but sacrifices UHF tuning range and board density; SMV1232-011 improves Q and matching at higher cost and supply complexity-making BB179B,315 the optimal balance of performance, size, and manufacturability for consumer UHF tuners.
Availability
BB179B,315 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators, FM radio front-ends, and RF filter tuning modules requiring stable component supply, tight capacitance matching, and ultra-compact packaging.
Supply support for BB179B,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 markets.
The BB179B,315 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, low-loss voltage-controlled tuning in UHF broadcast and communications equipment.
FAQ
What is the maximum reverse voltage rating for BB179B,315?
The BB179B,315 has an absolute maximum reverse voltage (VR) rating of 32 V, as defined in IEC 60134 limiting values. Exceeding this voltage risks permanent junction damage. The peak reverse voltage (VRM) is rated at 35 V when used in series with a 10 kΩ resistor, supporting transient tolerance in real-world bias networks. Always operate within 28 V for reliable capacitance specification compliance.
How does the capacitance matching of BB179B,315 benefit circuit design?
The BB179B,315 achieves ≤2 % capacitance matching across sequences of 10 diodes using gliding matching and Direct Matching Assembly (DMA). This enables predictable performance in multi-varactor configurations-such as balanced VCO cores or tunable filter banks-without per-unit calibration. Designers can rely on consistent tuning slope and center-frequency repeatability across production batches.
Is BB179B,315 suitable for automotive applications?
No, BB179B,315 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. Its specified operating junction temperature range is −55 °C to +125 °C, but qualification per AEC-Q200 or similar automotive standards is absent. For automotive-grade varactors, consult NXP's dedicated automotive portfolio.
What is the series resistance of BB179B,315 and why does it matter?
The BB179B,315 exhibits a typical series resistance (rs) of 0.6–0.75 Ω measured at 470 MHz. This low rs directly impacts resonator Q-factor and VCO phase noise: lower resistance reduces thermal noise contribution and maintains high tank efficiency. In UHF tuning applications, keeping rs below 0.8 Ω is critical to avoid frequency drift and spurious response under modulation.
Can BB179B,315 be substituted with BB179B without revision impact?
Yes-BB179B,315 is the standard ordering variant of the BB179B device, with "315" denoting tape-and-reel packaging per NXP's ordering convention. Electrical specifications, pinout, package dimensions, and matching performance are identical to the base BB179B type number. No PCB or schematic changes are required when migrating between BB179B and BB179B,315.
BB179B,315 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,315 FAQ
1.How can I place an order for BB179B,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB179B,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 BB179B,315 reliable?
The price and inventory of BB179B,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB179B,315 is usually 5 days.
3.What payment methods are accepted for BB179B,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB179B,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB179B,315?
BB179B,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB179B,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 BB179B,315?
For technical support, including BB179B,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB179B,315 requirements.
6.How does Aetrix verify that BB179B,315 is sourced from the original manufacturer or authorized distributors?
All BB179B,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 BB179B,315 meets industry standards.
7.What is the process for return or replacement of BB179B,315?
All BB179B,315 units undergo pre-shipment inspection (PSI). If there is an issue with BB179B,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 BB179B,315 part is unused and in its original packaging.
Return procedure for BB179B,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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