The production of a cheep and efficient 5 transistor microchip for basic AM radio set circuit functions. It was integrated circuits like this that lead to a lot smaller and cheaper pocket radios.
The then Western standard silicon\germanium etching process.
|Transistors per chip.||5.|
|Power supply.||Low and battery power.|
|Still in use.||No, but MK484, TA7642, (mostly found in India, the Far East and Australasia) YS414 and LMF501T are the modern versions. YS414 part has pins 1 (output) and 3 (ground/earth) are transposed.|
The ZN414 was a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti, but was also available from GEC-Plessey. The ZN414 was popular amongst hobbyists as a fully working AM radio could be made with just a few external components, a crystal earpiece and a 1.5 V cell.
The ZN414 was popular amongst hobbyists as a fully working AM radio could be made with just a few external components like an arial, a crystal earpiece and a 1.5 V cell and so on.
The manufacturing process for the ZN414 chip used a relatively new (for the time) technique known as Collector Diffusion Isolation (CDI). CDI was invented by engineers at Bell Telephone Laboratories and subsequently developed into a commercial process by Ferranti in the UK.
Pros and consEdit
- The TO-18 case can dissipate heat better than the similarly sized plastic TO-92 package.
- The TO-18 case is more expensive than the similarly sized plastic TO-92 package.
- Integrated circuits
- TO-92 transistor packing unit shell
- TO-18 transistor packing unit shell.