TO-92 (TO-226) COMPONENT PACKAGE
TO-92 (TO-226) Component Package
Date Published: | |
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Overview
Name | TO-92 (Transistor Outline 92) |
Synonyms |
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Variants |
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Similar To | TO-226 |
Mounting | TH |
Pin Count | 3 |
Pitch | Variable, commonly adjusted to 2.54mm. |
Solderability | Perfect for hand soldering and prototyping! Fits well into breadboards. |
Thermal Resistance |
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Land Area | n/a |
Height | 10mm (typical, including body and enough space to get the through-hole legs mounted in the PCB). |
3D Models | n/a |
Common Uses |
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Usage
TO-92 is a very common package for low-power through-hole transistors, MOSFETs, and linear regulators.
Variants
TO-92
If a package is just labelled as TO-92, then it is most likely to be the “standard” variant, which is also known as TO-226AA.
TO-92/18
The TO-92/18 variant of the TO-92 package is similar to the standard package (which is just called the TO-92), except that it has a longer body. It is also known as the TO-226AB or TO-92MOD package.
Pin Numbering
Pin numbering is always done from left-to-right, when the flat side of the TO-92 package is facing you and the legs are pointing downwards, as shown in the following diagram:
This is applicable to both the standard TO-92 (TO-226AA) and TO-92/18 (TO-226AB) variants.
Standard Pinouts
The pinout for JEDEC-named 2N series transistors is standardised as per the following table:
Pin Number | BJT Connection |
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1 | Emitter (E) |
2 | Base (B) |
3 | Collector (C) |
Thermal Resistance And Heatsinks
There are a limited range of heatsinks available for the TO-92 component package. Aavid Thermalloy makes two TO-92 heatsinks, one of which is currently available (as of May 2016) on DigiKey.
Authors

This work is licensed under a Creative Commons Attribution 4.0 International License .
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