Heat Component for testing

[kitepassion]

I'd like to make MOS measurement at different temperature. So I'd like to heat the component. Do you know the best solution for this pourpuse? I want something that can I embed in the PCB.
One only constraint is not cover the component. The component should be visibile.

Thank you
Cheers

 

[jiripolivka]

I'd like to make MOS measurement at different temperature. So I'd like to heat the component. Do you know the best solution for this pourpuse? I want something that can I embed in the PCB.
One only constraint is not cover the component. The component should be visibile.

Thank you
Cheers

You can certainly find miniature heaters that fit under the IC tested. I used another approach, low-cost and very efficient.
Locate your IC on board inside of a small enclosure. If the temperature would not exceed ~120 deg.C, it can be a plastic box, too. Install close to the tested device a high-power resistor, best in a ceramic block. Choose a value suitable to dissipate one to five watts from a variable DC power supply. On the IC glue a temperature sensor. It can be a k-thermocouple or another similar device. I used a small calibrated thermistor (directly connected to a display showing temperature.
Test the device without the tested IC. Plug all openings to avoid air draft. A suitable temperature growth was in my case ~ 0-40 deg.C per hour, with a top temperature mostly 70 deg.C, in some cases up to 120 deg.C (for this I used a 25W auto lamp). For the best results I included a small DC fan to circulate air evenly.

Next to the professional temperature chamber this approach was tested dozens of times, with excellent results. I used the same way to test systems installed in NEMA boxes where external temperature may vary from -30 to +70 deg.C. Very useful with microwave blocks which are not allowed to get wet, always heated over dew point to remove moisture.

 

[kitepassion]

You can certainly find miniature heaters that fit under the IC tested. I used another approach, low-cost and very efficient.
Locate your IC on board inside of a small enclosure. If the temperature would not exceed ~120 deg.C, it can be a plastic box, too. Install close to the tested device a high-power resistor, best in a ceramic block. Choose a value suitable to dissipate one to five watts from a variable DC power supply. On the IC glue a temperature sensor. It can be a k-thermocouple or another similar device. I used a small calibrated thermistor (directly connected to a display showing temperature.
Test the device without the tested IC. Plug all openings to avoid air draft. A suitable temperature growth was in my case ~ 0-40 deg.C per hour, with a top temperature mostly 70 deg.C, in some cases up to 120 deg.C (for this I used a 25W auto lamp). For the best results I included a small DC fan to circulate air evenly.

Next to the professional temperature chamber this approach was tested dozens of times, with excellent results. I used the same way to test systems installed in NEMA boxes where external temperature may vary from -30 to +70 deg.C. Very useful with microwave blocks which are not allowed to get wet, always heated over dew point to remove moisture.

Thank you for the quick reply! Unfortunately even if this methods seems very effective, I cannot use it. The plastic box will cover my device... I was thinking as well to some miniatures heaters and then use an external temperature sensor... Any other solution maybe also not so power hungry ?

- - - Updated - - -

Another solution could be : on the opposite side of the PCB in the same position of the DUT, having a transistor glued with thermal paste. To control the temperature a PT100 or a thermocouple...
What do you think?

 

[chuckey]

Without controlling the air flow, you will not get accurate results.
Frank