105R-681J

Overview

The Delevan 105R-681J is an obsolete surface-mount RF inductor with a nominal inductance of 680 nH and a tolerance of ±5%. It features a maximum DC resistance of 0.62 ohms and a rated current of 395 mA. The component operates within a temperature range of -55°C to +125°C and exhibits a self-resonant frequency of 175 MHz.

Feature Summary

• Surface-mount construction for PCB integration
• Unshielded design suitable for specific RF layouts
• Wide operating temperature capability

Applications

• RF circuit filtering
• Impedance matching networks
• General-purpose RF signal processing

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Procurement requires verification of remaining stock availability through authorized distributors or secondary market suppliers. Designers should confirm lead times and authenticity carefully, as direct factory orders are no longer supported.

Selection Notes

Engineers replacing this part must account for its obsolete status. Selection criteria should focus on matching the 680 nH inductance, 0.62 ohm DCR, and physical footprint. Verify that alternative components meet the required Q factor and self-resonant frequency specifications for the target RF application.

Part Context

The 105R series represents Delevan's line of unshielded chip RF inductors. These components utilize ferrite core technology to provide stable inductance values in compact surface-mount packages. The series is designed for high-frequency applications where magnetic shielding is not strictly required.

Replacement Considerations

Direct substitutes include the 105R-681K (±10% tolerance) and the shielded 105R-681G variant. Evaluate these options based on tolerance requirements and shielding needs before finalizing a replacement strategy.