History of Transistors;Part-4

Initially the material used for transistor case shape is plastic epoxy. But the plastic case devices may degrade over time. So, the combinations of plastic and metal case shapes are developed in mid 1960s.

Initially the material used for transistor case shape is plastic epoxy. But the plastic case devices may degrade over time. So, the combinations of plastic and metal case shapes are developed in mid 1960s.