1812LS-105XJLB – COILCRAFT

Overview

The Coilcraft 1812LS-105XJLB is a high-performance, unshielded wirewound RF inductor designed for demanding signal path applications. Its primary function is to introduce controlled impedance and energy storage in resonant circuits, critical for filtering and impedance matching in radio frequency front-ends. A key design consideration for inductors of this inductance value (1 mH) is the inherent trade-off between inductance, DC resistance (DCR), and self-resonant frequency (SRF). While the 1 mH provides significant filtering capability, achieving a low DCR of 44 Ohms and a usable SRF of 1.9 MHz at this inductance requires careful winding and core selection, as seen in this ceramic-cored component.

Key Features

• Inductance: 1 mH
• Tolerance: ±5%
• Maximum DC Current: 50 mA
• Maximum DC Resistance: 44 Ohms
• Minimum Q Factor: 30 @ 790 kHz
• Dimensions: 4.95 mm x 3.81 mm x 3.43 mm (1812 metric)

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• RF signal filtering in wireless communication modules.
• Impedance matching networks for antenna systems.
• Choke elements in power supply decoupling circuits.
• Resonant tank circuits for oscillator stabilization.