Infineon Technologies BB68902VH7908XTSA1

Overview

BB68902VH7908XTSA1 from Infineon Technologies is a silicon tuning diode (varactor) designed for VHF TV tuner front-end voltage-controlled oscillator (VCO) and filter tuning circuits. It delivers a capacitance range of 2.5–61.5 pF at 1 MHz, 20.9 typical capacitance ratio (CT₁/CT₂₈), 0.85 Ω typical series resistance at 470 MHz, and operates from –55 °C to +150 °C in SC79 package.

For engineers reviewing the BB68902VH7908XTSA1 datasheet, BB68902VH7908XTSA1 pinout, BB68902VH7908XTSA1 application, or BB68902VH7908XTSA1 equivalent, key selection criteria include VHF tuning linearity, low RF loss at 470 MHz, tight capacitance matching (≤2% across 7-diode sequence), and RoHS-compliant SMT packaging for high-volume tuner module assembly.

Technical Context

This varactor diode functions as a voltage-dependent capacitor in resonant tank circuits, where reverse bias voltage (1–28 V) directly controls junction capacitance. Its low series resistance (0.85 Ω typ.) and minimal series inductance (0.6 nH) preserve Q-factor above 100 MHz, critical for stable VHF oscillator phase noise performance.

The device employs an "in-line" matching assembly process ensuring ≤2% capacitance deviation across production lots-enabling precise multi-stage filter alignment without individual trimming. Its SC79 package supports automated placement and reflow compatibility per JEDEC J-STD-020.

Key Specifications

Pinout & Package

SC79 package: 2-terminal surface-mount device with cathode marked by laser dot on top surface. Anode and cathode terminals are co-planar; no internal leads or bond wires. Thermal pad not present. Compatible with standard IR-reflow profiles (peak 260 °C).

Key Features

Applications

Availability

BB68902VH7908XTSA1 is available at Aetrix Electronics and suitable for VHF TV tuners, FM radio VCOs, automotive RKE transmitters, and broadcast IF filter banks requiring stable component supply across extended temperature ranges and high-volume SMT production.

Supply support for BB68902VH7908XTSA1 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, RF, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

BB68902VH7908XTSA1 belongs to Infineon's BB689 varactor family, engineered specifically for high-linearity, low-loss VHF tuning in broadcast receiver front-ends where capacitance matching and thermal stability are design-critical.

FAQ

What is the cathode marking method for BB68902VH7908XTSA1?

The cathode is marked with a laser dot on the top surface of the SC79 package, positioned adjacent to the cathode terminal. This marking complies with JEDEC standards for polarity identification and is visible under 10× magnification. No bar or stripe is used-only the discrete dot distinguishes cathode orientation for automated optical inspection during SMT placement.

Does BB68902VH7908XTSA1 support bias voltages above 28 V?

No. The absolute maximum reverse voltage is 30 V DC, but capacitance characterization and matching specifications are guaranteed only between 1 V and 28 V. Operating above 28 V risks exceeding the specified 2.9 pF minimum capacitance and may degrade long-term reliability due to increased electric field stress at the junction.

How does the 0.6 nH series inductance affect VHF performance?

The 0.6 nH LS contributes <0.2 Ω reactance at 100 MHz and <1.9 Ω at 500 MHz, remaining negligible versus the 0.85 Ω rS. This ensures the impedance remains dominantly resistive across VHF, preserving predictable C–V linearity and avoiding spurious resonance in tank circuits below 1 GHz.

Is BB68902VH7908XTSA1 pin-compatible with BB689-02V?

Yes-both share identical SC79 package dimensions, terminal layout, and cathode marking. BB68902VH7908XTSA1 is a date-code and reel-packaged variant of BB689-02V, with identical electrical specs and matching performance. The "H7908XTSA1" suffix denotes Infineon's internal lot and packaging code, not functional differentiation.