The KL-224/25,4/SW/V/I is an electronic circuit part from German manufacturer Seifert. It is a low-profile two-stage EMI filter, designed to reduce electromagnetic interference in audio, communications, and instrumentation applications. The extruded heatsink helps to dissipate heat and increase the part's overall efficiency. The part is available in different packages, including SOT32, SOT93, TO126, TO218, TO220, TO247, and TOP3. It's designed to be especially beneficial for designs with limited space and thermal management requirements.