BB639E7904HTSA1

Overview

The BB639E7904HTSA1 is a single varactor diode manufactured by Infineon Technologies, designed for UHF and VHF tuner applications. It operates within a maximum reverse voltage of 30 V and supports a maximum forward current of 20 mA. The device features a series resistance of 0.65 Ω and exhibits specific capacitance values at defined bias points: CT1 is 29.75 pF and CT2 is 2.85 pF. These parameters define its tuning ratio performance under standard test conditions.

Feature Summary

• Single diode configuration optimized for radio frequency tuning circuits
• Capacitance variation characteristics suitable for UHF and VHF frequency bands
• Low series resistance to minimize signal loss in high-frequency paths

Applications

• UHF tuner circuits
• VHF tuner circuits
• Frequency modulation systems

Procurement Notes

This component has reached end-of-life status and is officially discontinued by the manufacturer. Production has ceased, and no new units are being manufactured. Verification of authenticity is critical when sourcing remaining stock from third-party distributors, as availability is limited to existing inventory or surplus channels rather than direct factory supply.

Selection Notes

Engineers should evaluate alternative components due to the discontinuation of this part number. Selection criteria must prioritize matching capacitance ranges, reverse voltage ratings, and package compatibility with the original design requirements. Transitioning to newer generations requires re-validation of circuit performance to ensure stability across the intended operating temperature range.

Part Context

The BB639 series represents a line of varactor diodes specifically engineered for broadcast and communication tuner modules. This particular variant utilizes the SOD-323 surface-mount package, facilitating automated assembly in compact electronic devices. The product falls under Infineon's discrete semiconductor portfolio focused on RF tuning solutions.

Replacement Considerations

Consult official replacement guides for updated varactor diode models compatible with UHF/VHF tuners. Verify that substitute parts maintain equivalent capacitance ratios and voltage tolerances to preserve circuit integrity without requiring significant schematic modifications.