Normally standard RF transistors are soldered to PCB or copper heatsink. For mounting transistor (example BLM10D3438-70ABG https://www.ampleon.com/products/mobile-broadband/3.3-4.2-ghz-transistors/BLF8G38LS-75V.html) on aluminium heatsink simple reflow soldering is impossible. Could anybody help me with standard procedures for mounting RF transistor on aluminium heatsink. (I have tried to solder on PCB SMD type, but transistor is too hot). Lastly, the transistor case do not have any flange for screwing to heatsink.
Thanks in advance.
Place a very thin film of silicon paste under the transistor then clamp the transistor to the heat sink with a special clamp.
Thank you. Standard paste is not conductive, is there any special solution?
Assembly and soldering rules are specified in the link below.
https://www.ampleon.com/documents/application-note/AN10896.pdf
If you can't find a solution, you can change the design, choose the size of the heat sink larger than the transistor, and make it as Heat sink + thermal paste + aluminum frame. You attach the frame from the outside of the transistor with bolts...
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