ACH4518-221-TD01

Overview

The ACH4518-221-TD01 is a surface-mount EMI filter circuit manufactured by TDK Corporation. It functions as an LC (T) network designed for signal line and DC power line applications. The component features a capacitance of 220 pF, a voltage rating of 50 V, and a current rating of 2 A. It utilizes SMD/SMT termination and is housed in an 1812 (4532 metric) package with dimensions of 4.5 mm length, 3.2 mm width, and 1.8 mm height. The device provides 25 dB attenuation within the 150 MHz to 250 MHz frequency range.

Feature Summary

• Provides electromagnetic interference suppression for signal lines and DC power circuits
• Utilizes an LC T-filter topology for effective noise reduction
• Designed for high-current applications with a 2 A rating

Applications

• Signal line filtering
• DC power line filtering

Procurement Notes

Verify availability status carefully as this component is listed as obsolete or end-of-life by major distributors. Confirm if existing stock remains or if alternative sourcing channels are required. Ensure compatibility with replacement components before proceeding with procurement decisions due to potential supply chain discontinuation.

Selection Notes

Select this component when a 2 A current capacity and 50 V rating are required for EMI suppression in compact designs. The 1812 package size suits space-constrained PCB layouts. Verify that the 220 pF capacitance aligns with specific filtering requirements for the target frequency band.

Part Context

This part belongs to the TDK ACH series of three-terminal filters intended for power lines. It shares the 1812 footprint and general electrical characteristics with other variants in the series, such as different capacitance values like 470 pF or 153 nF, while maintaining similar voltage and current ratings.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.