History and originEdit
It was created in the late 1950s as a universal package for small transistors.
Construction and orientationEdit
It is a small, unpainted steel or aluminium can with 3 steel wires coming out of the steel base plate. The container is sealed with resin and filled with either resin, glass dust, epoxy or a puff of argon gas.
A clear mica, glass, plastic or epoxy panel was placed in the top to let the light out. LEDs and light sensors now have an molded clear or tinted epoxy case.
Pros and consEdit
The case can dissipate heat better than the similarly sized plastic TO-92 package.
The case is more expensive than the similarly sized plastic TO-92 package.
It was one of the 2 original universal package that took over from the various non-standardised units. It was retained in heat sensitive situations.
- Integrated circuits
- ZN414 integrated circuit
- TO-5, T0-18 and other related related package sizes