据《半导体世界》（日文）1994年第8期报道，三洋公司现已开发出9种可装载厚2．smm、SOW级的高输出器件小型表面安装“ZP”管壳，已开始出售样品。目前，开关电源的发展速度相当迅速，开关速度年年在提高，正向小型、轻量、高效化方向进展。以往，大部是使用TO－220系列的表面 According to the “Semiconductor World” (Japanese) No. 8, 1994, Sanyo has developed 9 kinds of loadable thicknesses 2. smm, SOW-class, high-output devices Small surface-mount “ZP” housings have begun selling samples. At present, the development speed of the switching power supply is quite rapid, the switching speed is increasing year by year, and the trend towards small size, light weight and high efficiency is progressing. In the past, most of them used TO-220 series surface