集成电路的封装形式主要有圆形金属壳封装、菱形金属壳封装、塑料或陶瓷扁平式封装、四列扁平式封装、塑料或陶瓷单列直插式封装、双列直插式封装、四列直插式封装和软封装等。识别集成电路引脚的基本方法是:将集成电路引脚朝下,从定位标记开始按逆时针方向数。 Integrated circuit packages are mainly round metal shell package, diamond metal shell package, plastic or ceramic flat package, four flat package, plastic or ceramic single in-line package, dual in-line package, four straight Plug-in package and soft package. The basic method of identifying IC pins is to place the IC pins face down and counterclockwise from the position mark.