BB 555 E7908

Overview

The BB 555 E7908 is a single silicon varactor diode manufactured by Infineon Technologies, designed for surface-mount applications in the SCD-80 package. It features a maximum reverse voltage of 30 V and operates within a junction temperature range of -55°C to +150°C. The device exhibits a capacitance of 2.3 pF at 28 V and 1 MHz, with a typical tuning ratio of 9.8 under C1/C28 conditions. This component is classified as obsolete and is no longer in active production.

Feature Summary

• Single-channel varactor configuration optimized for RF tuning circuits
• Capable of operation across an extended industrial temperature range up to 150°C
• Surface-mount construction utilizing the compact SCD-80 package format

Applications

• RF circuit tuning
• Voltage-controlled oscillators
• Frequency modulation stages

Procurement Notes

This component has been officially discontinued by Infineon Technologies and is no longer available through standard manufacturing channels. Verification of current availability should focus on secondary market distributors or surplus inventory holders. Engineers must confirm the authenticity of existing stock due to the end-of-life status. Replacement strategies should be initiated immediately to ensure supply chain continuity for ongoing projects.

Selection Notes

Designers requiring this specific electrical profile must evaluate alternative varactor diodes that match the 30 V reverse voltage rating and similar capacitance characteristics. The transition from the legacy SCD-80 package to modern surface-mount footprints requires careful PCB layout adjustments. Compatibility checks for the new component's tuning ratio and temperature stability are essential to maintain original circuit performance specifications without redesigning the entire RF stage.

Part Context

The BB 555 series represents a line of silicon varactor diodes historically utilized in radio frequency applications. The E7908 suffix denotes specific binning or packaging variations within this family. As part of Infineon's broader portfolio of discrete semiconductors, these components were engineered for reliability in consumer electronics and communication devices before being phased out in favor of newer technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not identified in the provided documentation. Engineers should consult official replacement guides or contact manufacturer support for validated cross-reference data.