ECW-U SMD Film Capacitors Panasonic Electronic Components surface mountable ECW-U Film Capacitors have a stacked metallized PEN film dielectric and are available in 100V, 250V, and 630V. The ECW-U Film Capacitors from Panasonic Electronic Components have a simple moldless construction and offer small size, reflow solder design, operating temperature range of -55°C to +125°C, and RoHS compliance.