TO-126

TO-126

TO-126

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TO-126 is a type of semiconductor package for devices with three pins, such as transistors.[1] The package is rectangular with a hole in the middle to allow for easy mounting to a board or a heat sink. On one side of the package typically a metal sheet is exposed, with the transistor die bonded to the other side of the metal sheet inside the package.[2] This allows for an efficient heat transfer from the transistor die to an external heat sink but also implies that the metal sheet is electrically connected to the die (for a bipolar junction transistor usually the collector is connected to this metal sheet).

Front and back of a transistor in a TO-126 package.

History and origin

The JEDEC TO-126 descriptor is derived from the original full name for the package: Transistor Outline Package, Case Style 126.[3] In the updated JEDEC outline system, the package is numbered as TO-225AA.[2]

STMicroelectronics refers to this package style as SOT-32.[4]

National Standards

Size comparison of BJT transistor packages, from left to right: SOT-23, TO-92, TO-126, TO-3
More information Standards organization, Standard ...
  1. Russian: КТ-27

See also

  • TO-66, a metal package with similar power ratings
  • TO-220, a plastic package with higher power ratings

References

  1. [1]
    BD135; BD137; BD139; NPN power transistors (PDF), Philips Semiconductors, 1999, retrieved 2013-12-09
  2. [2]
    Bill Roehr (2001), AN1040/D: Mounting Considerations For Power Semiconductors (PDF), On Semiconductor, retrieved 2014-01-25
  3. [3]
    "JEDEC TO-126 package specification" (PDF). JEDEC. May 1968. Archived from the original (PDF) on June 18, 2017.
  4. [4]
    MJE340 MJE350 Complementary silicon power transistors (PDF), STMicroelectronics
  5. [5]
    "TO-225" (PDF). JEDEC. Archived from the original (PDF) on 2016-04-10. Retrieved 2021-06-21.
  6. [6]
    "TGL 26713/09: Gehäuse für Halbleiterbauelemente - Bauform H" [Outline drawings for semiconductor devices; Type H] (PDF) (in German). Leipzig: Verlag für Standardisierung. June 1988. Retrieved 2021-06-15.
  7. [7]
    "NPN Silicon Transistors BD135 BD137 BD139" (PDF). Siemens. Retrieved 2021-08-20.
  8. [8]
    "ГОСТ 18472—88 ПРИБОРЫ ПОЛУПРОВОДНИКОВЫЕ - Основные размеры" [GOST 18472—88 Semiconductor devices - basic dimensions] (PDF) (in Russian). Rosstandart. 1988. p. 56. Retrieved 2021-06-17.
  9. [9]
    "ГОСТ Р 57439—2017 ПРИБОРЫ ПОЛУПРОВОДНИКОВЫЕ - Основные размеры" [GOST R 57439—2017 Semiconductor devices - basic dimensions] (PDF) (in Russian). Gosstandart. 2017. p. 70-71. Retrieved 2021-06-17.


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