Mounting transistors MRF1K50HRS

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Mounting transistors MRF1K50HRS

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w8hw
Contributor I

I am an experimenter that just purchased two (2) of your transistors MRF1K50HRS. I also have two (2) BLF188xr transistors. I plan on using those (MRF1K50HRS) on 1-54 MHz, perhaps on higher frequencies on later projects.

 

Question 1. I see in your videos you using (for mounting) a screw-in set-up, While I see in other videos (non NXP people) soldering the bottom of transistor to copper spreader. Presumably that is done for better heat transfer. Is there a true advantage to soldering? They show this being done on a stove or hot plate. Your comments on that please.

 

Question 2. What is the name of the screw-in device where can I purchase it and do you recommend it? Recommendation on heat transfer compound?

 

Do you have any other suggestions or comments for me?

 

To improve of what I have now, do you have any links for board designs for me?

 

I thank you very much.

Bruce Campbell

Email w8hw@comcast.net

Phone 772.340.1620

455 sw Dahled ave

Port Saint Lucie, Florida 34953

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LPP
NXP Employee
NXP Employee

We recommend soldering RF power devices since it offers many advantages: lower thermal resistance, increase in the MTTF, increased long therm environmental reliability. In the lab condition, long therm reliability is not critical and sometimes we use bolt down mounting because of ease replacement of tested devices.

Application Notes on the topic

AN1908 - Solder Reflow Attach Method for High Power RF Devices in Air Cavity Packages
https://www.nxp.com/docs/en/application-note/AN1908.pdf

AN3263 — Bolt Down Mounting Method for High Power RF Transistors and RFICs in Over-Molded Plastic Packages
https://www.nxp.com/docs/en/application-note/AN3263.pdf

AN3789 - Clamping of High Power RF Transistors and RFICs in Over - Molded Plastic Packages
https://www.nxp.com/docs/en/application-note/AN3789.pdf

NXP does not sell any clamping devices. The one that is described in AN3789 is available from distributors. Though it doesn't fit the dimensions of MRF1K60H or MRF1K60N.

Have a great day,
Pavel
TIC
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