Tantalum capacitors for military apps

Solutions to bridge the gap between the solid tantalum capacitors that are available commercially and what is available in MIL specifications are presented. Manufacturers are offering and promoting high-reliability (Hi-Rel) commercial-off-the-shelf (COTS) tantalum capacitors that combine the reliability required in demanding military applications with the latest in capacitor technology required to meet challenging design goals. Hi-Rel COTS capacitors need to start with the most robust commercial designs and be redesigned for improved reliability, every capacitor should meet Hi-Rel qualifications, and devices should be held against standards that are in accordance with the Group-A inspection requirements of MIL-PR F-55365, including reflow conditioning, thermal shock, surge current, and reliability screening. Engineer surge current testing is helpful to avoid failures on turn on and is highly recommended if the end application involves an AC or pulsed signal with an appreciable current.