NXP Semiconductors BB173LXYL

Overview

BB173LXYL from NXP Semiconductors is a VHF variable capacitance diode (varactor) fabricated in planar technology, designed for tuning circuits in high-frequency oscillators. It delivers Cd = 39 pF at VR = 1 V, Cd = 2.6 pF at VR = 28 V, Cd(1V)/Cd(28V) ratio = 15, and low series resistance of 0.7 Ω at 100 MHz - enabling precise voltage-controlled frequency adjustment in compact RF modules.

For engineers reviewing the BB173LXYL datasheet, BB173LXYL pinout, BB173LXYL application, or BB173LXYL equivalent, key selection criteria include reverse voltage range (up to 32 V), ultra-small DFN1006D-2 footprint, cathode/anode polarity marking, and verified capacitance linearity across 1–28 V for VCO calibration and filter tuning.

Technical Context

The BB173LXYL operates as a reverse-biased junction varactor, where applied DC bias modulates depletion-layer width to vary junction capacitance. Its planar silicon structure ensures stable C-V response with minimal temperature drift (TCCd < 10⁻⁴ K⁻¹) and low leakage (IR ≤ 10 nA at VR = 30 V).

Designed specifically for VHF band operation (30–300 MHz), it supports high-Q resonant tank circuits via low rs (0.7 Ω typ.) and high capacitance ratio (15:1), minimizing phase noise in oscillator designs while maintaining compatibility with standard SMD reflow profiles.

Key Specifications

Pinout & Package

BB173LXYL is housed in the SOD882D (DFN1006D-2) ultra-small leadless plastic package: 2-terminal, bottom-soldered, cathode marked by a bar on the top surface. Body size is 1.0 mm × 0.6 mm × 0.4 mm with 0.55 mm pitch between solder pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BBY52-02W and MV2103, BB173LXYL offers optimal balance of ultra-small footprint, 15:1 tuning ratio, and sub-1 Ω series resistance - making it the preferred choice for space-constrained, high-Q VHF oscillator designs where phase noise and layout density are critical.

Availability

BB173LXYL is available at Aetrix Electronics and suitable for VHF oscillator design, FM radio tuner modules, and RF filter calibration requiring stable component supply, consistent parametric performance, and RoHS-compliant SMD packaging.

Supply support for BB173LXYL 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.

BB173LXYL belongs to NXP's RF discrete portfolio, engineered specifically for high-frequency tuning applications in VHF communications equipment - emphasizing low parasitics, repeatable C-V characteristics, and robust thermal performance in miniature packages.

FAQ

What is the maximum reverse voltage rating for BB173LXYL?

The BB173LXYL has an absolute maximum reverse voltage (VR) rating of 32 V, as defined in IEC 60134 limiting values. Operation beyond this voltage risks permanent junction damage. For reliable long-term use in VCO designs, NXP recommends staying within 28 V reverse bias - the upper limit specified for capacitance characterization and linearity validation in the datasheet.

How is polarity identified on the BB173LXYL package?

The BB173LXYL uses a cathode bar marking on the top surface of the SOD882D (DFN1006D-2) package to indicate Pin 1 (cathode). When viewing the device in top-down orientation with the marking bar on the left, Pin 1 is the left terminal and Pin 2 (anode) is the right terminal - consistent with standard SMD diode polarity conventions.

Does BB173LXYL require special PCB layout considerations?

Yes - due to its 1.0 × 0.6 mm footprint and RF function, BB173LXYL requires symmetric, short (<0.5 mm) solder pad traces to minimize parasitic inductance. Ground plane clearance under the package should be minimized, and thermal relief on pads is discouraged. The BB173LXYL datasheet specifies solder profile compatibility with standard lead-free reflow, but thermal mass imbalance must be avoided to prevent tombstoning.

What is the typical capacitance temperature coefficient (TCCd) of BB173LXYL?

The BB173LXYL exhibits a typical capacitance temperature coefficient (TCCd) below 10⁻⁴ K⁻¹ across 1–28 V reverse bias, as shown in Figure 5 of the NXP datasheet. This low drift ensures frequency stability better than ±50 ppm/°C in VHF oscillator tanks - critical for applications lacking active temperature compensation.

Can BB173LXYL be used in UHF applications above 300 MHz?

The BB173LXYL is characterized and optimized for VHF (30–300 MHz), with rs = 0.7 Ω measured at 100 MHz. While usable up to ~450 MHz in low-Q circuits, its effective Q begins declining above 300 MHz due to series resistance and package parasitics. For dedicated UHF designs, NXP recommends the BBY58 family - but BB173LXYL remains valid for broadband VHF/UHF front-ends where layout constraints prioritize size over ultimate high-frequency Q.