The Panasonic ECA-1EM221BJ is a radial lead type aluminum electrolytic capacitor, part of the M series. It's characterized by its endurance of 85°C for 2000 hours, making it suitable for demanding applications. The capacitor is RoHS directive compliant, ensuring environmental responsibility. It offers a compact design, smaller than the SU series, and is available in a range of capacitance values and voltage ratings. Typical applications include power supplies, filtering circuits, and other electronic devices requiring stable and reliable capacitance.