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741 op-amp in TO-5 metal can package close-up

Operational amplifier in a TO-5 package, viewed from above.

TO-5 Heatsinks

Gear-shaped heat sinks for TO-5 packages. Author: Tpdwkouaa.

History and originEdit

It was created in the late 1950s as a universal package for small transistors, rectifiers, amplifiers and voltage regulators.

The "TO-" element of the name stands for "transistor outline" and the number then refers to specific item in a series of technical drawings produced by JEDEC.

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 was sealed with resin and filled with either resin, glass dust, epoxy or a puff of argon gas.

The H06C variant with 6 pins and the H08A variant has 8 pins with the marker tab over the last one. The pin's counting order is clockwise from taken from the bottom perspective, the tab marking the first in the count.

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.

Heat sinksEdit

A large circular heat sink was put around hotter running higher voltage units.

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. http://www.dx.com/s/transistor+pack
  2. https://en.wikipedia.org/wiki/Electronic_packaging
  3. https://en.wikipedia.org/wiki/TO-5
  4. https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/transistor-ratings-packages-bjt/
  5. http://parts.subaru.com/p/Subaru__/POWER-TRANSISTOR/49503456/73533FA011.html
  6. https://www.alibaba.com/product-detail/TO-46-Header-transistor-package_60438972449.html
  7. http://ronja.twibright.com/datasheets/metal_cans.pdf
  8. http://eesemi.com/to5.htm
  9. https://www.jedec.org/sites/default/files/docs/archive/to/to-005.pdf
  10. https://www.google.co.uk/search?q=TO-5&safe=off&tbm=isch&tbo=u&source=univ&sa=X&ei=hn-sUszkN6vIsASHjYHoDQ&ved=0CDcQsAQ&biw=1348&bih=579&gws_rd=cr
  11. https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/transistor-ratings-packages-bjt/
  12. http://parts.subaru.com/p/Subaru__/POWER-TRANSISTOR/49503456/73533FA011.html
  13. https://www.alibaba.com/product-detail/TO-46-Header-transistor-package_60438972449.html
  14. http://ronja.twibright.com/datasheets/metal_cans.pdf
  15. http://www.siliconfareast.com/to5.htm
  16. https://www.jedec.org/sites/default/files/docs/archive/to/to-005.pdf

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