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NXP Semiconductors BB179LX,315
- Part No.:
- BB179LX,315
- Manufacturer:
- NXP Semiconductors
- Package:
- SOD-882
- Datasheet:
-
BB179LX,315.pdf
- Description:
- DIODE UHF VAR CAP 30V SOD882T
- Quantity:
- Payment:
- Shipping:
Inventory:9,572
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Product details
Overview
BB179LX,315 from NXP Semiconductors (formerly Philips) is a UHF variable capacitance diode (varactor) fabricated using planar technology in an ultra-small SOD882T leadless SMD package. It delivers Cd(1V) = 20 pF (typ), Cd(28V) = 2.1 pF (typ), Cd(1V)/Cd(28V) ratio = 9 (typ), series resistance rs = 0.65 Ω (typ at 470 MHz), and 2% matching via Direct Matching Assembly (DMA), enabling precise tuning in high-frequency oscillator circuits.
For engineers reviewing the BB179LX,315 datasheet, BB179LX,315 pinout, BB179LX,315 application, or BB179LX,315 equivalent, key selection criteria include reverse voltage range (1–28 V), capacitance linearity, low-series-resistance performance at UHF, and matched-pair capability for differential VCO topologies.
Technical Context
The BB179LX,315 operates as a voltage-controlled capacitor where junction capacitance varies inversely with applied reverse bias. Its planar structure and DMA-based matching ensure tight capacitance tracking across paired devices under identical bias conditions.
Designed for UHF operation, it exhibits stable capacitance characteristics up to 470 MHz with minimal series resistance (0.65 Ω typ) and low temperature coefficient of capacitance (TCCd ≈ 10⁻⁴ K⁻¹). Reverse leakage remains ≤10 nA at VR = 30 V and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd(1V) | 20 pF typical - sets baseline tuning range start point in VCO tank circuits |
| Cd(28V) | 2.1 pF typical - defines minimum capacitance and maximum oscillation frequency |
| Cd(1V)/Cd(28V) ratio | 9:1 typical - enables wide frequency tuning bandwidth in single-stage VCOs |
| Series resistance (rs) | 0.65 Ω typical at 470 MHz - minimizes Q-factor degradation and phase noise impact |
| Reverse voltage range | 1–28 V - compatible with standard analog tuning voltage rails and DAC outputs |
| Capacitance matching | ≤2% over 1–28 V (gliding DMA) - supports balanced, low-phase-error differential VCO designs |
| Package dimensions | 1.0 × 0.6 × 0.4 mm - enables high-density RF layout in space-constrained tuners and transceivers |
Pinout & Package
SOD882T is a 2-terminal, leadless ultra-small plastic surface-mount package with body dimensions 1.0 × 0.6 × 0.4 mm. The cathode is marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher DC potential in reverse-biased varactor configuration; marking bar identifies this terminal |
| 2 | Anode | Connected to RF ground or lower DC potential; forms the junction with cathode to define depletion region capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Direct Matching Assembly (DMA) | Guarantees ≤2% capacitance deviation across 5-device sequences - critical for push-push VCOs and image-reject mixers |
| Low series resistance | 0.65 Ω at 470 MHz - preserves tank circuit Q > 100 in 400–900 MHz VCOs |
| High capacitance ratio | 9:1 (1V/28V) - supports >30% fractional frequency tuning without band-switching |
| UHF-optimized planar junction | Stable C–V response up to 470 MHz with <±5% variation - avoids parasitic resonance in tuner front-ends |
Applications
| Voltage-Controlled Oscillator (VCO) | VHF Television Tuner Front-End |
|---|---|
Use Scenario: Tuning element in monolithic LC-tank VCOs for wireless transceivers operating at 400–900 MHz. IC Role / Device Role / Timing Role: Voltage-variable capacitor defining resonant frequency of the oscillator tank circuit. Use Value: 9:1 capacitance ratio and 0.65 Ω series resistance enable low-phase-noise operation with ±50 ppm stability over temperature. |
Use Scenario: Channel-select tuning capacitor in analog VHF TV tuner IF and RF stages. IC Role / Device Role / Timing Role: Varactor diode providing electronic tuning of bandpass filters and local oscillator frequency. Use Value: Tight 2% DMA matching ensures consistent channel-to-channel gain and image rejection across multi-channel tuner modules. |
| Differential Pair VCO Core | FM Radio Receiver Tuning |
Use Scenario: Matched pair used in symmetrical cross-coupled VCO architectures for improved common-mode rejection. IC Role / Device Role / Timing Role: Dual varactor forming complementary tuning elements in differential LC tank. Use Value: Gliding DMA matching maintains <0.5° phase skew between arms, reducing even-order harmonics and supply-pump leakage. |
Use Scenario: Frequency calibration capacitor in portable FM radio receivers requiring low-voltage tuning (1–3 V). IC Role / Device Role / Timing Role: Low-voltage varactor adjusting local oscillator frequency to track station carrier. Use Value: Cd(1V) = 20 pF provides sufficient tuning sensitivity at 1–3 V bias, minimizing DAC resolution requirements in digital-tuning systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BBY52,215 | Cd(1V) = 27 pF, Cd(28V) = 2.5 pF, ratio = 10.8; rs = 0.8 Ω; SOD323 package (1.7 × 1.3 × 0.9 mm) | Higher baseline capacitance suits lower-frequency VCOs (100–400 MHz); larger footprint limits high-density RF layouts | Select when wider tuning range at sub-UHF is prioritized over board space and UHF Q-performance |
| SMV1232-011 | Cd(1V) = 18.5 pF, Cd(28V) = 2.05 pF, ratio = 9; rs = 0.75 Ω; SC-79 package (1.2 × 0.8 × 0.5 mm) | Near-identical C–V specs but slightly higher rs; no DMA matching specified - requires external binning for matched pairs | Choose when cost sensitivity outweighs need for factory-matched pairs; verify matching in-system if used differentially |
Compared with BB179LX,315, BBY52,215 offers greater low-end capacitance but sacrifices UHF efficiency and board area; SMV1232-011 matches C–V closely but lacks guaranteed DMA matching, increasing design effort for differential VCOs.
Availability
BB179LX,315 is available at Aetrix Electronics and suitable for voltage-controlled oscillators, VHF television tuners, differential VCO cores, and FM radio receiver tuning requiring stable component supply and traceable sourcing.
Supply support for BB179LX,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 specializing in secure connectivity solutions for automotive, industrial, and consumer applications.
The BB179LX,315 belongs to NXP's legacy RF varactor portfolio, originally developed by Philips for high-precision UHF tuning in broadcast and wireless infrastructure equipment.
FAQ
What is the maximum reverse voltage rating for BB179LX,315?
The BB179LX,315 has an absolute maximum reverse voltage (VR) rating of 30 V per IEC 60134. Operation above 28 V reduces usable capacitance range and increases risk of junction breakdown; recommended bias range is 1–28 V for optimal C–V linearity and reliability. The BB179LX,315 must not be forward-biased during normal operation.
Does BB179LX,315 support matched-pair operation out of the box?
Yes - the BB179LX,315 is manufactured using Direct Matching Assembly (DMA) and gliding matching to achieve ≤2% capacitance deviation across sequences of five devices. This factory-level matching eliminates need for post-production binning when implementing differential VCOs or image-reject architectures. The BB179LX,315 data sheet confirms this performance under "diode capacitance matching" in Table 5.
What is the typical series resistance of BB179LX,315 at UHF frequencies?
The BB179LX,315 exhibits a typical series resistance (rs) of 0.65 Ω measured at 470 MHz with Cd = 30 pF. This low value directly contributes to high Q-factor (>100) in practical LC tanks, minimizing phase noise degradation in VCOs. The BB179LX,315 rs remains stable across its 1–28 V tuning range, as shown in Figure 2 of the datasheet.
Can BB179LX,315 be used in FM radio tuning applications?
Yes - the BB179LX,315 is suitable for FM radio receiver tuning due to its 20 pF capacitance at 1 V bias, which provides adequate sensitivity for 88–108 MHz local oscillator adjustment using low-voltage DACs or potentiometers. Its low series resistance and stable C–V curve ensure minimal distortion and tracking error. The BB179LX,315 has been deployed in portable FM tuner modules requiring compact, reliable tuning elements.
What package type does BB179LX,315 use and how is polarity identified?
The BB179LX,315 uses the SOD882T package: a 2-terminal, leadless ultra-small plastic SMD case measuring 1.0 × 0.6 × 0.4 mm. Polarity is indicated by a marking bar on the top surface, which identifies Pin 1 as the cathode. Pin 2 (anode) is unmarked and located opposite the bar. This orientation is confirmed in the pinning diagram (Figure 5) and discrete pinning table of the BB179LX,315 datasheet.
BB179LX,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 2.22pF @ 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:
- SOD2
BB179LX,315 FAQ
1.How can I place an order for BB179LX,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB179LX,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 BB179LX,315 reliable?
The price and inventory of BB179LX,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB179LX,315 is usually 5 days.
3.What payment methods are accepted for BB179LX,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB179LX,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB179LX,315?
BB179LX,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB179LX,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 BB179LX,315?
For technical support, including BB179LX,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB179LX,315 requirements.
6.How does Aetrix verify that BB179LX,315 is sourced from the original manufacturer or authorized distributors?
All BB179LX,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 BB179LX,315 meets industry standards.
7.What is the process for return or replacement of BB179LX,315?
All BB179LX,315 units undergo pre-shipment inspection (PSI). If there is an issue with BB179LX,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 BB179LX,315 part is unused and in its original packaging.
Return procedure for BB179LX,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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