Infineon Technologies BB55502VE7908XT

Overview

BB55502VE7908XT from NXP Semiconductors is a silicon tuning diode (varactor) designed for UHF-TV tuner front-end VCO and RF filter tuning circuits, featuring 14.01 pF typical capacitance at 2 V, 8.9 typical capacitance ratio (CT₁/CT₂₈), and 0.6 nH series inductance in SC79 package.

For engineers reviewing the BB55502VE7908XT datasheet, BB55502VE7908XT pinout, BB55502VE7908XT application, or BB55502VE7908XT equivalent, key selection criteria include capacitance vs. voltage curve linearity across 1–28 V, low r_S (0.58 Ω typ.) for Q-factor preservation at 470 MHz, and tight capacitance matching (±0.25% over 4-diode sequence) for multi-stage tuning alignment.

Technical Context

This varactor operates as a voltage-controlled capacitor in resonant tank circuits, where reverse bias (1–28 V) modulates junction depletion width to tune frequency. Its SC79 package minimizes parasitic inductance (0.6 nH) and resistance (0.58 Ω typ.), enabling stable operation up to UHF bands.

The device delivers a measured CT₁/CT₂₈ ratio of 8.9 with ±0.25% capacitance matching across four diodes in sequence - critical for phase-aligned tuning in multi-band TV tuners requiring consistent tracking between RF and IF stages.

Key Specifications

Pinout & Package

SC79 ultra-small surface-mount package (1.3 × 0.7 × 0.5 mm), anode/cathode marked by laser dot on cathode side; optimized for high-frequency layout with minimal pad inductance.

Key Features

Applications

Availability

BB55502VE7908XT is available at Aetrix Electronics and suitable for UHF-TV tuner modules, automotive infotainment systems, portable DVB-T receivers, and SDR front-end filters requiring stable component supply with tight capacitance matching and UHF-grade parasitics.

Supply support for BB55502VE7908XT 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.

BB55502VE7908XT belongs to NXP's BB5xx silicon tuning diode product line, engineered specifically for high-linearity, low-parasitic RF tuning in broadcast receiver front ends and frequency-agile communication systems.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The BB55502VE7908XT has a rated DC reverse voltage (V_R) of 30 V at 25°C, with a peak reverse voltage (V_RM) of 35 V. Operation above 30 V is not recommended for long-term reliability, especially above 85°C where IR increases significantly - derating to 25 V is advised for 150°C ambient designs.

How does capacitance matching impact multi-diode tuning arrays?

With ±0.25% capacitance matching across four diodes in sequence, BB55502VE7908XT enables predictable, repeatable frequency tracking in cascaded tuning banks. This eliminates need for post-assembly calibration and reduces yield loss in mass-produced TV tuner modules where multiple varactors set harmonic-related frequencies.

Can this diode be used in 5G sub-6 GHz front-end tuning?

Yes - its 0.6 nH series inductance and 0.58 Ω r_S maintain capacitive dominance up to 3 GHz, supporting sub-6 GHz 5G NR bands (3.3–4.2 GHz). However, capacitance at 1 V (17.5 pF typ.) falls outside optimal range for many 5G PA impedance-matching networks; verify C-V slope linearity at target bias points.

Is the SC79 package compatible with standard reflow profiles?

Yes - the Pb-free SC79 package complies with JEDEC J-STD-020C Level 1 moisture sensitivity and supports peak reflow temperatures up to 260°C. Standard SnAgCu solder paste and 60–90 sec above 220°C profiles achieve reliable void-free joints without die cracking or marking degradation.