105R-681G

Overview

The Delevan 105R-681G is an obsolete surface-mount RF inductor with a nominal inductance of 680 nH and a tolerance of 2%. It features a maximum DC resistance of 620 mOhms and a rated current of 685 mA. The component operates within a temperature range of -55°C to +125°C, maintaining a minimum Q factor of 40 at 25 MHz. Its self-resonant frequency is 105 MHz. The device utilizes an unshielded ferrite core construction housed in a standard 1008 (2520 metric) package.

Feature Summary

• Unshielded surface-mount design for high-frequency applications
• Ferrite core construction providing stable inductance characteristics
• Standard SMD/SMT termination style for PCB mounting

Applications

• RF circuit filtering
• High-frequency signal processing
• Impedance matching networks

Procurement Notes

This component is officially classified as obsolete and is no longer manufactured by Delevan. Verification of availability should focus on surplus distributors or secondary markets rather than direct manufacturer channels. Buyers must confirm the authenticity and storage history of existing stock due to the part's discontinued status. Cross-referencing with current equivalent components is recommended for new designs.

Selection Notes

Designers requiring this specific inductance value should consider that the 105R series is discontinued. Selection criteria must account for the unshielded nature of the component, which may influence nearby circuit layout to prevent interference. Alternative parts from the same family, such as shielded variants, offer different electrical profiles but require re-evaluation of the circuit design parameters.

Part Context

The 105R-681G belongs to the Delevan 105R series of fixed RF inductors. This series is characterized by unshielded chip inductors designed for general-purpose RF applications. The 105R designation indicates a specific footprint and performance tier within the broader API Delevan inductor portfolio, distinct from their shielded S1008R line.

Replacement Considerations

Publicly confirmed substitute part numbers include LQW2UASR68F00L. Designers should verify mechanical compatibility and electrical equivalence before substitution.