Find out specification for a component

[Yan9370]

Hello Guys,
I am having a heat component on a PCB, constant voltage is applying on the heat source for a period of time.I can measuring the temperature of the heat component before and after the testing. Just wondering is there any way to find out the specification of the heat component ? Like the heat conductivity ?
I have attached my 3D model for the heat component below.

Thank you so much!

 

[berkeman]

Hello Guys,
I am having a heat component on a PCB, constant voltage is applying on the heat source for a period of time.I can measuring the temperature of the heat component before and after the testing. Just wondering is there any way to find out the specification of the heat component ? Like the heat conductivity ?
I have attached my 3D model for the heat component below.

Thank you so much!

Welcome to the PF.

What is a "Heat component on a PC Board"? Why would you on-purpose put a hot or heating component on a PC Board? Usually you want your electronic components on your PC Board Assembly (PCBA) to be as cool as possible.

Can you provide more details? Can you post a datasheet for this component? Why do you want a heated component on a PCBA?

 

[Yan9370]

Welcome to the PF.

What is a "Heat component on a PC Board"? Why would you on-purpose put a hot or heating component on a PC Board? Usually you want your electronic components on your PC Board Assembly (PCBA) to be as cool as possible.

Can you provide more details? Can you post a datasheet for this component? Why do you want a heated component on a PCBA?

Sorry, I wasn't very clear.
I created a 3D model on SolidWorks(the one that i attached) with a electronic components on PCB, according to the simulation results on SolidWorks, the electronic component was heated up to 65 degree. However, in real test that i did it only heated up to 34 degree.The component was originally at room temperature.
I would like to calibrate SolidWorks simulation results with this real resting. Unfortunately, i don't have datesheet for this electronic component. So that is why i am wondering is there any way to figure out the specification for this electronic component.

Hope this would make my self a bit more clear.
Thank you !

 

[berkeman]

Sorry, I wasn't very clear.
I created a 3D model on SolidWorks(the one that i attached) with a electronic components on PCB, according to the simulation results on SolidWorks, the electronic component was heated up to 65 degree. However, in real test that i did it only heated up to 34 degree.The component was originally at room temperature.
I would like to calibrate SolidWorks simulation results with this real resting. Unfortunately, i don't have datesheet for this electronic component. So that is why i am wondering is there any way to figure out the specification for this electronic component.

Hope this would make my self a bit more clear.
Thank you !

I get a security warning when I try to open that PDF file. How did you pick the "components" for your simulation? How are you modeling them? Are you just putting in power dissipation numbers and physical sizes? How are you modeling the heat sinking provided by the component pins and PCB traces? That may be one reason that your real-world PCBA components are not heating up as much as in your simulation.

 

[Yan9370]

I get a security warning when I try to open that PDF file. How did you pick the "components" for your simulation? How are you modeling them? Are you just putting in power dissipation numbers and physical sizes? How are you modeling the heat sinking provided by the component pins and PCB traces? That may be one reason that your real-world PCBA components are not heating up as much as in your simulation.

I just used a 50ohm resistor. I modeled the components and the PCB with scale 1:1 in SolidWorks and simply putting in power to the electronic component as a volume heat source. I don't have datasheet for the components but i found a similar one online : https://ca-en.alliedelec.com/caddock-mp9100-50-0-1-/70089611/

Is there any way to find out the specific heat and thermal conductivity of this component?

Thank you!

 

[berkeman]

Is there any way to find out the specific heat and thermal conductivity of this component?

The datasheet gives the thermal resistance from the junction to the case, but not for when it is mounted on a PCB without a heat sink...

http://www.caddock.com/Online_catalog/Mrktg_Lit/MP9000_Series.pdf

 

[CWatters]

Can you clarify...

The only component on the PCB is a resistor in a T0-247 package?
How much power is it dissipating in the model and in real life? The same?
Where are you measuring/comparing the temperatures? On the case of the T0-247? In the air above it?

In real life the power is dissipated in the middle of the T0-247 package and it's conducted to the outside (Thermal resistance, Junction to Case is 1.50 °C⁄W). I'm not familiar with SolidWorks but how does it model a "volume heat source"? I dare say the surface temperature isn't the same as it would be for a T0-247 dissipating the same power.

 

[Tom.G]

Unfortunately, i don't have datesheet for this electronic component. So that is why i am wondering is there any way to figure out the specification for this electronic component.

Quoting from pg 2 of the data sheet at: http://www.caddock.com/Online_catalog/Mrktg_Lit/MP9000_Series.pdf
Momentary Overload: 1.5 times rated power with
applied voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds. ∆R
±(0.5 percent + 0.0005 ohm) max.

Roughly, this type of spec. gives you an idea of how long it takes the innards of the device to exceed the maximum storage temperature, but that's not specified for this component. Instead they specify overload to keep within the resistance tolerance. You could calculate maximum internal temperature using the worst-case temperature coefficient of resistance from the data sheet.
But really, I suggest you ask the manufacturer.