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NXP Semiconductors BB178LX,315
- Part No.:
- BB178LX,315
- Manufacturer:
- NXP Semiconductors
- Package:
- SOD-882
- Datasheet:
-
BB178LX,315.pdf
- Description:
- DIODE UHF VAR CAP 32V SOD882T
- Quantity:
- Payment:
- Shipping:
Inventory:9,236
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Product details
Overview
BB178LX,315 from NXP Semiconductors is a planar technology variable capacitance diode (varactor) in an ultra-small SOD882T leadless SMD package, optimized for VHF tuning applications up to 460 MHz. It delivers Cd(1V) = 39 pF (typ), Cd(28V) = 2.6 pF (typ), Cd(1V)/Cd(28V) ratio = 15 (typ), series resistance rs = 0.7 Ω (typ at 100 MHz), and ±2 % capacitance matching via Direct Matching Assembly (DMA).
For engineers reviewing the BB178LX,315 datasheet, BB178LX,315 pinout, BB178LX,315 application, or BB178LX,315 equivalent, key selection criteria include VHF capacitance tuning range, low-series-resistance performance at 100 MHz, tight capacitance matching across reverse voltage sweep, and compatibility with high-density RF layout constraints of SOD882T (1.0 × 0.6 × 0.4 mm).
Technical Context
The BB178LX,315 operates as a reverse-biased junction varactor, where capacitance varies nonlinearly with applied DC bias from 1 V to 28 V. Its planar silicon structure enables stable temperature coefficient and repeatable DMA matching across production lots.
Designed specifically for VHF band B (up to 460 MHz), it supports electronic tuning in analog TV tuners and compact VCOs. Capacitance characterization is specified at f = 1 MHz (for Cd) and f = 100 MHz (for rs), with Tj = 25 °C baseline and validated operation from −55 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cd(1V) | 39 pF typical - sets maximum VCO tuning range and low-frequency resonance point |
| Cd(28V) | 2.6 pF typical - defines minimum capacitance for high-end VHF frequency coverage |
| Cd(1V)/Cd(28V) ratio | 15:1 typical - enables wide electronic tuning bandwidth in single-diode VCO designs |
| rs (series resistance) | 0.7 Ω typical at 100 MHz - minimizes Q-factor degradation and phase noise in oscillator tanks |
| Capacitance matching | ±2 % over VR = 1–28 V (gliding 5-diode sequence) - ensures consistent tuning slope across matched pairs |
| Reverse voltage rating | 32 V max - supports robust bias margin above 28 V operating limit for long-term reliability |
| Package dimensions | 1.0 × 0.6 × 0.4 mm - enables placement in space-constrained RF front-end modules and tuner IC packages |
Pinout & Package
BB178LX,315 uses the SOD882T ultra-small leadless plastic package (2-terminal, body size 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 | DC reverse bias input; connected to tank circuit ground reference in VCO designs |
| 2 | Anode | AC signal node; ties to inductor/resonator in parallel-tuned VCO configurations |
Key Features
| Feature | Design Value |
|---|---|
| Direct Matching Assembly (DMA) | ±2 % capacitance matching across 1–28 V sweep - eliminates manual binning in production VCO calibration |
| Ultra-low series resistance | 0.7 Ω at 100 MHz - preserves tank Q > 100 in 200–460 MHz VCOs with 3.3 nH inductors |
| VHF-optimized capacitance ratio | 15:1 Cd(1V)/Cd(28V) - supports full-band channel selection without switched capacitor banks |
| SOD882T footprint | 0.6 mm width - fits between RF IC pads in 3.2 mm × 3.2 mm tuner modules with 0.3 mm solder mask dams |
Applications
| VHF Television Tuner (Band B) | VCO for Wireless Microphone Transmitters |
|---|---|
Use Scenario: Analog VHF TV tuner module requiring electronic channel selection across 174–230 MHz (Band B). IC Role / Device Role / Timing Role: Varactor diode providing voltage-controlled capacitance in LC resonator tank for local oscillator tuning. Use Value: 15:1 capacitance ratio and ±2 % DMA matching enable single-component tuning across all Band B channels without calibration offsets. |
Use Scenario: Compact UHF/VHF wireless microphone transmitter with 174–216 MHz operating band. IC Role / Device Role / Timing Role: Tuning element in Colpitts VCO core, biased via PLL-controlled DAC output. Use Value: 0.7 Ω series resistance maintains phase noise < −110 dBc/Hz at 10 kHz offset in 200 MHz oscillators. |
| FM Radio Receiver Front-End | Portable DTV Tuner Module |
Use Scenario: Low-power portable FM radio receiver covering 87.5–108 MHz band. IC Role / Device Role / Timing Role: Voltage-variable capacitor in mixer LO injection path for image rejection tuning. Use Value: SOD882T package allows placement within 0.5 mm of RF transceiver die, minimizing parasitic inductance. |
Use Scenario: Integrated digital TV tuner module for handheld devices targeting 174–230 MHz DVB-T Band B reception. IC Role / Device Role / Timing Role: Primary tuning diode in dual-VCO architecture for agile channel switching. Use Value: Tight 2 % DMA matching ensures < 0.5 MHz frequency error across 1000-unit production batch without per-unit trimming. |
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) = 25 pF, Cd(28V) = 2.2 pF, ratio = 11.4:1; rs = 1.1 Ω at 100 MHz; SOD323 package (1.7 × 1.3 × 0.9 mm) | Lower tuning range and higher series resistance limit use to narrowband VCOs below 200 MHz | Select when board space permits larger footprint and wider tolerance on tuning linearity is acceptable |
| SMV1232-011LF | Cd(1V) = 42 pF, Cd(28V) = 3.1 pF, ratio = 13.5:1; rs = 0.9 Ω at 100 MHz; SC-79 package (1.2 × 0.8 × 0.5 mm) | Larger package and lower ratio reduce VHF band edge coverage vs. BB178LX,315's 460 MHz capability | Prefer for legacy designs using SC-79 land patterns; not recommended for new 460 MHz-critical layouts |
Compared with BBY52,215 and SMV1232-011LF, BB178LX,315 offers the highest Cd(1V)/Cd(28V) ratio (15:1) and smallest footprint (SOD882T), enabling wider VHF tuning range and tighter integration in next-generation tuner modules.
Availability
BB178LX,315 is available at Aetrix Electronics and suitable for VHF television tuners, wireless microphone transmitters, and portable DTV receiver modules requiring stable component supply and precise capacitance matching.
Supply support for BB178LX,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.
BB178LX,315 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, high-matching VHF electronic tuning in broadcast and wireless infrastructure equipment.
FAQ
What is the maximum reverse voltage rating for BB178LX,315?
The BB178LX,315 has an absolute maximum reverse voltage rating of 32 V, as defined by IEC 60134 limiting values. Operation up to 28 V is specified in characteristics tables, providing 4 V design margin for transient suppression and long-term reliability in VHF tuner bias networks.
How is capacitance matching achieved in BB178LX,315?
BB178LX,315 achieves ±2 % capacitance matching across 1–28 V via Direct Matching Assembly (DMA), a post-fabrication gliding sequence that selects and groups diodes with near-identical C–V curves. This process is performed on packaged units and documented in the BB178LX,315 datasheet Table 5.
Does BB178LX,315 support operation above 460 MHz?
No - BB178LX,315 is characterized and qualified for VHF Band B operation up to 460 MHz. Its capacitance and series resistance parameters are validated at 100 MHz for rs and 1 MHz for Cd; extrapolation beyond 460 MHz is not supported by NXP's published data or application guidance for BB178LX,315.
What is the thermal operating range of BB178LX,315?
The BB178LX,315 supports junction temperatures from −55 °C to +125 °C, with electrical characteristics specified at Tj = 25 °C. Reverse current increases to 200 nA maximum at VR = 30 V and Tj = 85 °C, confirming suitability for extended-temperature industrial tuner modules.
Is BB178LX,315 compatible with lead-free reflow processes?
Yes - BB178LX,315 is qualified for lead-free reflow per J-STD-020, with peak temperature tolerance up to 260 °C. Its SOD882T package uses matte tin termination and passes MSL1 classification, supporting standard Pb-free assembly without special handling for BB178LX,315.
BB178LX,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Capacitance @ Vr, F:
- 2.75pF @ 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:
- SOD2
BB178LX,315 FAQ
1.How can I place an order for BB178LX,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for BB178LX,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 BB178LX,315 reliable?
The price and inventory of BB178LX,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB178LX,315 is usually 5 days.
3.What payment methods are accepted for BB178LX,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB178LX,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BB178LX,315?
BB178LX,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BB178LX,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 BB178LX,315?
For technical support, including BB178LX,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB178LX,315 requirements.
6.How does Aetrix verify that BB178LX,315 is sourced from the original manufacturer or authorized distributors?
All BB178LX,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 BB178LX,315 meets industry standards.
7.What is the process for return or replacement of BB178LX,315?
All BB178LX,315 units undergo pre-shipment inspection (PSI). If there is an issue with BB178LX,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 BB178LX,315 part is unused and in its original packaging.
Return procedure for BB178LX,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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