Heatsink TO-220

Small heat sink for TO-220 components. Ideal for keeping your 5V and 3.3V regulators running cool. Black anodized bolt on type with 2.5W dissipation.


Heatsink TO-220 Product Help and Resources

Understanding Thermal Resistance

May 14, 2020

Discussing what thermal resistance is, how it’s used for thermal management, and how to maximize the life of your project.

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • What about including matching screws?

    • Member #644712 / about 9 years ago / 1

      i agree with this guy, was happy to get the heat sinks, even though it would be nice to get them with the power regulators/mosfets that will end up requiring them anyways but screws would be nice, i had to wait to assemble the project because i had no screws, but otherwise good product

  • MountainRider / about 12 years ago * / 2

    I dug around. This web page shows the individual items in the AAVID heat sink hardware kit:

    AAVID Heat Sink Mounting Kits

    Basically, you need SAE #4-40 machine screws, nuts, washers, and lock washers. These should be cheaper at your local hardware store than they are in a kit.

    The only real advantage of the kit is that it comes with an insulator, but I am going to guess that thermal paste is also more cost effective. If anyone knows of a reason to prefer an insulator over thermal paste, post a reply.

    Update: Sparkfun sells some of the necessary hardware:

    Unfortunately, it does not appear that Sparkfun sells washers or lock washers.

  • JohnGalt / about 13 years ago / 2

    can you provide a datasheet? What is the thermal resistance of this part in degrees C per watt?

  • Could we have a picture of it attached to the actual chip?

  • elgink / about 11 years ago * / 1
  • MountainRider / about 12 years ago / 1

    Where can I get mounting hardware for this part?

    • Kamiquasi / about 12 years ago / 1

      You mean a nut and bolt? That's usually how they attach :) Sometimes with a little thermal tape in between for better heat transfer.

  • Kyogai / about 13 years ago / 1

    What are the EXACT dimensions please?

    • Skreddern / about 13 years ago / 1


  • SomeGuy123 / about 13 years ago / 1

    I believe the Digikey part for this is HS115-ND.

  • MichaelK / about 13 years ago / 1

    Is this a set of two as in the picture, or a single unit?

Customer Reviews

5 out of 5

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Works good.

Nothing much to say. Does what it should do.