DIP Heatsink

Jdo300

Hello All,

I have a circuit with an 8-pin DIP IC mounted in an IC socket. I am looking for a snap-on heatsink that I can put on it to keep it from overheating but I am having some trouble finding one. I checked Mouser/Digikey and neither one seems to have anything (for an 8-Pin DIP anyway). Do any of you happen to know of any companies who might carry something like this?

Thanks,
Jason O

chroot

Generally, DIP is not an appropriate package for an IC that dissipates significant power. Are you possibly misusing your chip in some way?

- Warren

Jdo300

The chip is a MOSFET driver IC. In most cases, it won't have any overheating problems unless it is being clocked at the upper limit of it's power dissipation capabilities. There is a version of the chip that comes in a 5-pin TO-220 package but I prefer to use the DIP since I can socket it and replace it easily if/when it blows up without needing to re-solder it to the PCB.

chroot

Well, I don't know about any snap-on heatsinks, but I'd venture you could buy just about any small heatsink, put a layer of thermal grease on it, and screw it down onto your breadboard to keep it stable.

- Warren

edmondng

i use something called thermal pad or gap pad for one of my motor driver chips. Its expensive and its not connected electrically. Just slap it over the ic and you're done.

Example:
http://search.digikey.com/scripts/Dk...name=BER161-ND

Bergquist makes a lot of this stuff, different conductivity, thickness etc. You could probably request some samples from them. There are few more companies that does similar things like this have to look that up its been a while.

Jdo300

Hello All,

I finally found a source for the 8-pin DIP heatsink I was looking for here:

http://www.componentsuperstore.com/s...RMALLOY6937361

Now I need some assistance with something. I want to use it with he IXDD414 MOSFET driver Chip to keep it cool while running.

But I'm not sure how much cooler this heatsink will make the chip. The IC also comes in a TO220-5 package which I know I could just slap onto a regular heatsink but I want to be able to socket the IC easily and so far, I don't know of any TO220-5 sockets.

What I would like to know is how to calculate how much cooler the DIP package will be with the heatsink on it. How does one go about figuring this out?

Thanks,
Jason O

zeitghost

Reasonably easy.

Thermal resistance of the heatsink is 30 deg C per watt.

So if it's attached to something that's dissipating 1 watt, then the temperature of the heatsink will be 30 deg C above the ambient air temperature.

i.e. if the ambient air temperature is 25 deg C (as it always seems to be in this sort of thing) then the heatsink temperature will be 55 deg C.

This is a fairly gross simplification, but gives you a ball park figure for what's going on.

The chip temperature will depend on how good the thermal coupling is between the ic package and the heatsink, which will add x deg C per watt to the calculation, where x is determined by the type of gunk that you smear on the heatsink and chip package.