Aluminum Electrolytic Capacitors CDE / Illinois Capacitor Aluminum Electrolytic Capacitors are available in an extensive range of radial, axial lead, and surface-mount aluminum electrolytics, with multiple termination styles. CDE/Illinois Capacitor Aluminum Electrolytic Capacitors come in a variety of configurations for different use cases. Low ESR, high frequency and high-temperature types are especially popular and required for many high-performance electronic products.