105R-121K

Overview

The Delevan 105R-121K is a fixed surface-mount inductor designed for radio frequency applications. It features an unshielded construction with an iron core material, housed in a nonstandard rectangular package. The component provides a nominal inductance of 0.12 µH (120 nH) with a tolerance of ±10%. It supports a maximum DC current of 830 mA and exhibits a maximum DC resistance of 140 mΩ. The self-resonant frequency is specified at 500 MHz, ensuring effective performance in high-frequency circuits.

Feature Summary

• Unshielded design suitable for minimizing magnetic interference in specific layouts
• Iron core construction optimized for RF choke applications
• Surface mount configuration for automated PCB assembly

Applications

• RF signal filtering
• High-frequency impedance matching networks
• General purpose RF chokes

Procurement Notes

Verify the exact package dimensions against the official datasheet, as the 105R series utilizes a nonstandard footprint distinct from standard metric sizes. Confirm RoHS compliance status and lead-free specifications with the manufacturer prior to ordering. Ensure the selected variant matches the required inductance tolerance and current rating for the target circuit design.

Selection Notes

Select this component when an unshielded RF inductor is required to prevent magnetic coupling issues in dense layouts. The 120 nH value and 500 MHz self-resonant frequency make it suitable for higher frequency bands. Consider the 830 mA current rating to ensure adequate headroom for the application's operating conditions without saturation.

Part Context

The 105R series represents API Delevan's line of micro chip inductors. These components are engineered for surface mount technology, offering reliability in compact electronic designs. The series includes various inductance values tailored for different RF and general-purpose requirements, maintaining consistent quality standards across the product family.

Replacement Considerations

Cross-reference with other unshielded 120 nH SMD inductors if supply constraints exist. Verify that substitute parts match the 140 mΩ DCR limit and 830 mA current handling capability. Ensure the replacement maintains the 500 MHz self-resonant frequency characteristic for equivalent RF performance.