Infineon Technologies BB68902VH7902XTSA1

Overview

BB68902VH7902XTSA1 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-end voltage-controlled oscillator (VCO) and RF filter tuning circuits. It delivers a capacitance range of 2.5–61.5 pF at 1 MHz, a high capacitance ratio CT1/CT28 = 20.9, low series resistance rS = 0.85 Ω (typ.), and operates up to 150°C ambient temperature.

For engineers reviewing the BB68902VH7902XTSA1 datasheet, BB68902VH7902XTSA1 pinout, BB68902VH7902XTSA1 application, or BB68902VH7902XTSA1 equivalent, key selection criteria include VHF capacitance tuning linearity, thermal stability of C-V curve, matching tolerance across production lots, and SCD80 package compatibility with high-frequency PCB layout constraints.

Technical Context

This varactor diode functions as a voltage-dependent capacitor in resonant tank circuits, where reverse bias voltage (VR = 1–28 V) directly controls junction capacitance. Its "in-line" matching assembly ensures ≤2% capacitance deviation across 7-diode sequences, critical for multi-channel tuner alignment.

The device exhibits low parasitic series inductance (LS = 0.6 nH typ.) and minimal temperature coefficient of capacitance (TCC), enabling stable VCO center frequency over –55°C to +150°C. Its 0.85 Ω typical series resistance supports high Q-factor operation at 470 MHz.

Key Specifications

Pinout & Package

BB68902VH7902XTSA1 is housed in the SC79 (SOD-523) surface-mount package: 1.3 mm × 0.7 mm × 0.6 mm, cathode-marked top-side dot, single anode/cathode configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB68902VH7902XTSA1, BAS16HT1G sacrifices VHF tuning range and Q for cost and availability, while BBY52-02W extends tuning ratio at the expense of series resistance-making BB68902VH7902XTSA1 optimal for balanced VHF tuner designs demanding both range and spectral purity.

Availability

BB68902VH7902XTSA1 is available at Aetrix Electronics and suitable for VHF TV tuners, CATV filter modules, and ISM band transmitter calibration requiring stable component supply, tight capacitance matching, and high-temperature reliability.

Supply support for BB68902VH7902XTSA1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and RF components, with global R&D and manufacturing infrastructure.

BB68902VH7902XTSA1 belongs to Infineon's BB6xx silicon tuning diode product line, engineered specifically for high-reliability, high-volume VHF/UHF tuner applications in broadcast and cable infrastructure equipment.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at TA = 25°C. Derating is required above 25°C: VR decreases linearly to 25 V at +125°C. Peak reverse voltage of 35 V is permitted only with series limiting resistance ≥5 kΩ to prevent avalanche breakdown.

How does capacitance matching work across production lots?

Infineon uses an "in-line" matching assembly process where seven BB68902VH7902XTSA1 diodes are tested and binned sequentially on the same wafer strip. This ensures ≤2% ∆CT/CT variation across the group, enabling batch-level calibration instead of unit-by-unit trimming in tuner manufacturing.

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

No. While its 0.6 nH series inductance supports operation up to ~1 GHz, its capacitance range (2.5–61.5 pF) and C-V linearity are optimized for VHF (47–230 MHz). At 3.5 GHz, parasitic effects dominate and measured Q drops below usable thresholds for 5G PA impedance tuning.

Is the SC79 package compatible with standard reflow profiles?

Yes. BB68902VH7902XTSA1 in SC79 package is qualified for lead-free reflow per JEDEC J-STD-020 Rev E, with peak temperature ≤260°C for ≤30 seconds. The 0.6 mm height and cathode dot marking support automated optical inspection (AOI) in high-speed SMT lines.