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TO-18, 3 leads, ZN414 (shaded)

A drawing of a ZN414 IC in a TO-18 package.

History and originEdit

It was created in the late 1950s as a universal package for small transistors.

Construction and orientationEdit

GeneralEdit

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.

Clear tops for LEDs and light sensorsEdit

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

AdvantagesEdit

The case can dissipate heat better than the similarly sized plastic TO-92 package.

DisadvantagesEdit

The case is more expensive than the similarly sized plastic TO-92 package.

UsageEdit

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.

Also seeEdit

  1. Science
  2. Electronics
  3. Integrated circuits
  4. ZN414 integrated circuit
  5. TO-5, T0-18 and other related related package sizes

SourcesEdit

  1. https://www.wikiwand.com/en/TO-18
  2. https://images.search.yahoo.com/search/images;_ylt=AwrBT9AeA_lYmaYAE19XNyoA;_ylu=X3oDMTEyNHY5aGhmBGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjM1MTFfMQRzZWMDc2M-?p=TO-5+transistor+packing+unit+shell&fr=dss_yset_chr
  3. https://www.amazon.co.uk/s/?ie=UTF8&keywords=transistor&tag=hydrukspm-21&index=aps&hvadid=3171088672&hvqmt=p&hvbmt=bb&hvdev=c&ref=pd_sl_1qxdek2rzs_b
  4. https://www.rapidonline.com/Catalogue/Searches?query=diodes&filterSearchScope=1&tier=Transistors&pdg=kwd-138254648071:cmp-81881368:adg-6929960256:crv-16801751842:qry-TO-5%20transistor%20packing%20unit%20shell:dev-c&bclid=e2fc634e06fb43f789c28b0e726a88e2&utm_source=bing&utm_medium=cpc&utm_campaign=Bing%20-%20UK%20-%20Generic%20-%20Diodes&utm_term=transistor&utm_content=Transistors
  5. https://en.wikipedia.org/wiki/TO-18
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