The KL-164/SW is an extruded electronic part manufactured by Seifert. It is available in the U housing type and is made to fit SOT32, SOT93, TO126, TO218, TO220, TO247, and TOP3 formats. It is used with a Heatsink to prevent heat build-up and provide cooling to the component. The part is typically used as a passive component in oscillators, rectifiers, and will typically be seen in industrial and consumer low-voltage applications.