Large Heatsink - Multiwatt Package

This beefy heatsink is designed to dissipate a lot of heat! The 6400BG heatsink fits TO-220, TO-218, TO-247, and Multiwatt packages - which means it's a great fit for the STA540, L298N, and all of our T-220 package voltage regulators.

Large Heatsink - Multiwatt Package 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.

Variable Load Hookup Guide - Revised

May 25, 2018

This tutorial will show you how to assemble and use SparkFun's Variable Load board. It can be used to test stability of the power supply under various loads, battery lifetime, safety cutoffs, and other design elements of power supplies under test.

Magnetic Levitation

November 20, 2019

This tutorial will show you how to build a magnetic levitation circuit using common parts.

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.
See all skill levels


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.

  • bobdabiulder / about 8 years ago / 1

    How much heat does this sink? I would have bought it if I knew!!

  • Member #695036 / about 9 years ago * / 1

    What are the dimensions? Will it fit to a 40x40mm Peltier?

  • Member #59569 / about 10 years ago / 1

    Any idea how much this weighs?

  • X412 / about 12 years ago / 1

    I was able to find this part on Digikey after some digging. Considering how long this item has been disabled, please see below where you can get this part:

    Keep in mind this is the 1" high version. There's several in the series that have different heights.

  • Could this be used to get the Peltier cooler here down to around 30 deg. F?

  • BenjB / about 13 years ago / 1

    Is that hole threaded?

  • Member #35561 / about 13 years ago / 1

    Hello, is it possible to take this heat sink to a band saw to reduce the 7 cm dimension down to 5 cm?

    • DigiC / about 13 years ago / 1

      band saw may be too powerful, a diamond blade on a dremel is plenty or a hacksaw with metal cutting blade.

  • elfhec / about 14 years ago / 1

    Do you guys have a eagle footprint for this?
    Do people make footprints of heat sinks?

    • elfhec / about 14 years ago / 1

      Yes and Yes. It is part of the SFE eagle library and is also shown in the audio amplifier kit below.

Customer Reviews

5 out of 5

Based on 1 ratings:

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4 of 4 found this helpful:

My friend couldnt even kill it

I have this crazy physics friend that decided to make a plasma speaker on his own. He had a mosfet that was able to source RIDICULOUS amounts of current. He had at least 150W going through this mosfet. He was able to run his lightning arc for several minutes straight, the whole time without exceeding the max temperature of the mosfet. Now, I wouldn't recommend doing this (we got burnt on the heat sink, but the $12 mosfet was ok so its all good), but this is a durable highly effective heat sink!