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NXP Semiconductors BB178,315
- Part No.:
- BB178,315
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-79, SOD-523
- Datasheet:
-
BB178,315.pdf
- Description:
- DIODE VHF VAR CAP 32V SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
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Product details
Overview
BB178,315 from NXP Semiconductors is a planar variable capacitance diode (varactor) in SOD523 (SC-79) package, designed for VHF tuning applications up to 460 MHz. It delivers Cd(1V) = 34.65–42.35 pF, Cd(28V) = 2.361–2.754 pF, capacitance ratio Cd(1V)/Cd(28V) = 13.5–15, series resistance rs = 0.65–0.8 Ω at 100 MHz, and matching tolerance ≤2 % via Direct Matching Assembly (DMA).
For engineers reviewing the BB178,315 datasheet, BB178,315 pinout, BB178,315 application, or BB178,315 equivalent, key selection criteria include reverse voltage range (0–32 V), low-series-resistance tuning linearity, ultra-small SMD footprint, and guaranteed capacitance matching across diode pairs in VCO and TV tuner designs.
Technical Context
The BB178,315 operates as a reverse-biased junction varactor, where capacitance varies nonlinearly with applied DC bias (1–28 V). Its planar silicon structure enables tight process control for gliding matching across sequences of 10 diodes.
Capacitance tuning is characterized at 1 MHz with Tj = 25 °C; temperature coefficient is specified across 0–85 °C. Reverse leakage remains ≤10 nA at VR = 30 V and ≤200 nA at 85 °C, supporting stable VCO pullability in thermally varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd(1V) | 34.65–42.35 pF: sets minimum VCO tuning range and input impedance at low bias |
| Cd(28V) | 2.361–2.754 pF: defines maximum oscillation frequency ceiling and high-bias Q |
| Cd(1V)/Cd(28V) | 13.5–15: determines total frequency tuning ratio in VHF band B (up to 460 MHz) |
| rs @ 100 MHz | 0.65–0.8 Ω: ensures low insertion loss and high Q (>100 at 100 MHz) in resonant tank circuits |
| Matching tolerance | ≤2 % over 10-diode sequence: enables precise push-pull or differential VCO calibration without trimming |
| VR max | 32 V DC: sets absolute maximum tuning voltage for reliable long-term operation |
| Tj operating range | −55 to +125 °C: supports industrial-grade VHF front-end deployment without derating |
Pinout & Package
SOD523 (SC-79) ultra-small plastic surface-mount package: 1.25 × 0.85 × 0.65 mm body, 0.17 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | cathode | DC bias return path; connected to ground or tuning voltage reference in shunt-tuned VCOs |
| 2 | anode | RF signal node; placed directly in LC tank or coupling network for minimal parasitic inductance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitance linearity | Optimized for monotonic C–V curve across 1–28 V, reducing harmonic distortion in wideband VCOs |
| DMA matching | ≤2 % capacitance deviation across 10-device sequence enables factory-calibrated dual-varactor modules |
| Ultra-small SMD footprint | SOD523 package allows placement within <1.5 mm² PCB area-critical for compact TV tuner modules |
| Low series resistance | 0.65–0.8 Ω minimizes resistive losses in high-Q VHF resonators, preserving phase noise performance |
| VHF-rated construction | Validated operation up to 460 MHz (Band B TV) with stable C–V and leakage behavior at RF frequencies |
Applications
| TV Tuner Front-End | Voltage-Controlled Oscillator |
|---|---|
Use Scenario: Band B VHF television tuner (47–223 MHz) requiring electronic channel selection without mechanical components. IC Role / Device Role / Timing Role: Varactor diode providing voltage-variable reactance in parallel-tuned LC circuit for RF input filtering and local oscillator tracking. Use Value: 15:1 capacitance ratio enables full-band coverage with single-stage tuning; DMA matching ensures consistent channel-to-channel gain flatness. |
Use Scenario: Low-phase-noise VCO for wireless microphones or ISM-band transceivers operating near 160–450 MHz. IC Role / Device Role / Timing Role: Tuning element in Colpitts or Clapp oscillator topology, directly modulated by PLL control voltage. Use Value: Sub-0.8 Ω series resistance maintains tank Q > 120 at 200 MHz, limiting close-in phase noise degradation. |
| FM Radio Receiver | Automotive Remote Keyless Entry |
Use Scenario: Compact FM radio module (87.5–108 MHz) in portable audio devices with space-constrained PCB layout. IC Role / Device Role / Timing Role: Voltage-variable capacitor in IF or RF tracking filter, adjusted by microcontroller DAC output. Use Value: SOD523 footprint fits within 1.3 mm × 0.9 mm keep-out zone; 2 % DMA matching reduces calibration overhead in mass production. |
Use Scenario: 315 MHz RKE transmitter module requiring stable carrier frequency across −40 to +85 °C ambient. IC Role / Device Role / Timing Role: Primary tuning diode in LC tank of SAW-less oscillator, biased via voltage regulator. Use Value: Specified TCd vs. VR curve (Fig 3) and ≤200 nA IR at 85 °C ensure <±10 kHz drift over full temperature range. |
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 | Cd(1V) = 25–30 pF; Cd(28V) = 2.0–2.4 pF; ratio ≈12.5; rs = 0.9–1.1 Ω; SOD523 package | Narrower tuning range; higher series resistance reduces Q in high-frequency VCOs | Acceptable for narrowband FM tuners but not recommended for full-band VHF TV (460 MHz) due to lower ratio and Q |
| SMV1232-011 | Cd(1V) = 38–45 pF; Cd(28V) = 2.5–2.9 pF; ratio ≈14.5; rs = 0.7–0.9 Ω; SOD-323 package (1.7 × 1.3 mm) | Larger footprint increases parasitic inductance; tighter Cd(1V) tolerance (±5 %) but no DMA matching spec | Suitable for general-purpose VCOs where board space permits; lacks guaranteed 2 % matching for differential tuning schemes |
Compared with BBY52,115 and SMV1232-011, the BB178,315 uniquely combines 15:1 tuning ratio, ≤2 % DMA matching, and sub-0.8 Ω series resistance in the smallest SOD523 footprint-making it the only option qualified for production-critical VHF TV tuner modules requiring batch-matched varactors.
Availability
BB178,315 is available at Aetrix Electronics and suitable for VHF television tuners, voltage-controlled oscillators, FM radio receivers, and remote keyless entry systems requiring stable component supply across extended temperature ranges and high-volume manufacturing cycles.
Supply support for BB178,315 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 applications.
The BB178,315 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, matched-capacitance tuning in analog VHF front-ends-including broadcast TV tuners and license-free ISM-band transceivers.
FAQ
What is the maximum reverse voltage rating for BB178,315?
The BB178,315 has an absolute maximum reverse voltage (VR) rating of 32 V DC, with a peak reverse voltage (VRM) of 35 V when used in series with a 10 kΩ resistor. Exceeding 32 V DC risks permanent junction damage per IEC 60134 limiting values. The BB178,315 is typically operated between 1 V and 28 V to maintain specified capacitance linearity and matching performance.
Does BB178,315 support operation at 460 MHz?
Yes, the BB178,315 is explicitly characterized and qualified for electronic tuning in VHF television tuners up to 460 MHz (Band B). Its capacitance and series resistance parameters are validated at 1 MHz and 100 MHz, and its SOD523 package parasitics are optimized for stable RF performance through the upper VHF band. The BB178,315 datasheet confirms suitability for this frequency range in both general description and applications sections.
How is capacitance matching achieved in BB178,315?
Capacitance matching in the BB178,315 is achieved through a Direct Matching Assembly (DMA) procedure combined with gliding matching across sequences of 10 diodes. This yields ≤2 % capacitance deviation over the full 1–28 V bias range, enabling precise pair-wise or array-based tuning without post-assembly calibration. The BB178,315 specification sheet documents this as a guaranteed parameter under "Characteristics" Table 5.
What is the typical series resistance of BB178,315 at RF frequencies?
The BB178,315 exhibits a typical series resistance (rs) of 0.65–0.8 Ω measured at 100 MHz. This low value is critical for maintaining high Q-factor in VHF resonant tanks-directly impacting VCO phase noise and tuner selectivity. The BB178,315 datasheet specifies rs under "Characteristics" Table 5, confirming its suitability for high-performance RF tuning applications.
Is BB178,315 automotive-qualified?
No, the BB178,315 is not automotive-qualified. Per NXP's legal disclaimers in the BB178,315 datasheet, non-automotive qualified products are neither tested nor warranted for automotive use. The BB178,315 is rated for industrial temperature operation (−55 to +125 °C), but lacks AEC-Q200 stress testing, PPAP documentation, or automotive-specific reliability validation required for vehicle applications.
BB178,315 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:
- 2.754pF @ 28V, 1MHz
- Capacitance Ratio:
- 15.0
- 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
BB178,315 FAQ
1.How can I place an order for BB178,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB178,315 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 BB178,315 reliable?
The price and inventory of BB178,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB178,315 is usually 5 days.
3.What payment methods are accepted for BB178,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB178,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB178,315?
BB178,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB178,315 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 BB178,315?
For technical support, including BB178,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB178,315 requirements.
6.How does Aetrix verify that BB178,315 is sourced from the original manufacturer or authorized distributors?
All BB178,315 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 BB178,315 meets industry standards.
7.What is the process for return or replacement of BB178,315?
All BB178,315 units undergo pre-shipment inspection (PSI). If there is an issue with BB178,315, 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 BB178,315 part is unused and in its original packaging.
Return procedure for BB178,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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