NXP Semiconductors BB187LX,315

Overview

BB187LX,315 from NXP Semiconductors is a planar variable capacitance diode (varactor) in an ultra-small SOD882T leadless SMD package, designed for VHF tuning applications. It delivers 2.75 pF capacitance at 25 V reverse bias, a 11:1 capacitance ratio from 2 V to 25 V, and 0.7 Ω typical series resistance at 470 MHz - enabling precise frequency control in compact RF front-ends.

For engineers reviewing the BB187LX,315 datasheet, BB187LX,315 pinout, BB187LX,315 application, or BB187LX,315 equivalent, key selection criteria include its 2% gliding-matched capacitance tolerance, low-loss performance up to 470 MHz, ultra-compact 1.0 × 0.6 × 0.4 mm footprint, and suitability for high-density VHF oscillator and tuner designs requiring stable voltage-controlled reactance.

Technical Context

The BB187LX,315 operates as a reverse-biased junction varactor, where applied DC voltage modulates depletion-layer width to tune capacitance across 2.57–34.2 pF (25 V to 2 V). Its planar silicon structure and Direct Matching Assembly (DMA) process ensure tight inter-device capacitance matching within ±2% over 1–25 V.

Designed specifically for VHF band operation (30–300 MHz), it maintains low series resistance (0.7 Ω typ. at 470 MHz) and minimal temperature coefficient of capacitance, supporting stable oscillation in tuners and VCOs without external compensation networks.

Key Specifications

Pinout & Package

BB187LX,315 uses the SOD882T leadless ultra-small plastic package: 2-terminal surface-mount device with 1.0 × 0.6 × 0.4 mm body dimensions and cathode-indicating marking bar.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with BB187LX,315, BBY52,215 offers higher base capacitance but narrower tuning ratio, while SMV1232-011 improves series resistance and matching at identical footprint - making BB187LX,315 the balanced choice for cost-sensitive VHF tuner modules requiring proven 2% DMA matching and 11:1 range.

Availability

BB187LX,315 is available at Aetrix Electronics and suitable for VHF television tuners, voltage-controlled oscillators, FM radio receivers, and RF filter tuning modules requiring stable component supply with tight capacitance matching and ultra-compact packaging.

Supply support for BB187LX,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 BB187LX,315 belongs to NXP's RF varactor diode product line, engineered specifically for high-precision, high-density VHF tuning in broadcast and wireless infrastructure where matching accuracy and miniaturization are critical.

FAQ

What is the maximum reverse voltage rating for BB187LX,315?

The BB187LX,315 has a maximum reverse voltage (VR) rating of 32 V, as defined by IEC 60134 Absolute Maximum Ratings. This rating ensures reliable operation under typical VHF tuner bias conditions with margin for transient spikes. Exceeding 32 V may cause permanent junction damage. The BB187LX,315 is specified for continuous operation up to 25 V reverse bias in normal tuning applications.

How does the 2% capacitance matching of BB187LX,315 benefit circuit design?

The ±2% capacitance matching across 1–25 V reverse bias-achieved via Direct Matching Assembly (DMA)-enables predictable tracking in dual-varactor configurations without individual calibration. This reduces manufacturing test time and improves yield in VHF TV tuner modules where BB187LX,315 is used in push-pull tuning arrangements. The BB187LX,315 matching specification eliminates need for binning or trimming.

What is the typical series resistance of BB187LX,315 at 470 MHz?

The BB187LX,315 exhibits a typical series resistance (rs) of 0.7 Ω at 470 MHz and VR = 5 V, as measured per the manufacturer's characterization. This low loss supports high-Q resonant circuits essential for low-phase-noise VCOs. The BB187LX,315 rs remains stable across −55 °C to +125 °C junction temperature, ensuring consistent RF performance in varying thermal environments.

Can BB187LX,315 be used in UHF applications above 300 MHz?

The BB187LX,315 is characterized and optimized for VHF operation (30–300 MHz), with datasheet parameters validated up to 470 MHz. While usable in some UHF circuits, its 0.7 Ω rs and capacitance profile deliver best performance below 300 MHz. For dedicated UHF designs, alternatives like BBY52,215 offer better ratio and Q at higher frequencies. The BB187LX,315 remains valid for edge-of-band UHF use where VHF-optimized matching is prioritized.

What package type does BB187LX,315 use and how is polarity identified?

The BB187LX,315 uses the SOD882T ultra-small leadless plastic package (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 marking aligns with JEDEC-standard SOD882T orientation and ensures correct placement during automated SMT assembly of BB187LX,315.