MSP430F1232: TJ - junction temperature max

Darren Jenkins

Genius 13491 points

Part Number: MSP430F1232

MSP430 team,

The datasheet for the MSP430F1232 does not provide a max TJ value. Can we provide one?

Our customer is looking at removing the heat sink in their design and is doing some analysis where this would help.

Thanks,
Darren

over 6 years ago

0 JD Crutchfield over 6 years ago

TI__Mastermind 30560 points

Hey Darren,

What package? We don't have all the thermal information, especially for our older devices. We can generate it upon request but turn around is usually 2-3 weeks.

Luckily, I do see that the MSP430F1232IRHB (32 pin VQFN) has been previously requested and here is it's thermal information.

Theta JA = 32.1
Theta JC = 18.1
Theta JB = 6.0

Let me know if you want me to submit a request for a different package.

Thanks,

0 Darren Jenkins over 6 years ago in reply to JD Crutchfield

TI__Genius 13491 points

Hi JD,

I should have mentioned the package. This is the PW package (28 pin TSSOP).

Will you be able to generate the Theta JA/B/C and provide the max TJ?

Thanks,
Darren

0 Keith Barkley over 6 years ago in reply to Darren Jenkins

Guru 43955 points

Generally, the max TJ is package limited to 150 C due to the epoxy.

0 JD Crutchfield over 6 years ago in reply to Darren Jenkins

TI__Mastermind 30560 points

Hey Darren,

I believe Keith is referring to storage temp and is correct that the max is listed in the datasheet as 150C for unprogrammed devices.

For all practical purposes, Max operating TA = Max operating TJ. We even spec if this way on many of the MSP430F5xx devices. The reason for this is that at max power the MSP430 consumes milliWatts and the self-heating of the MSP430 is basically not enough to really matter.

More post here discussing this topic:

https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/576730/

https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/593263

https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/711979

I will submit a request for the Theta JA/B/C for this package and will update this thread when that info comes back.

Thanks,

0 Keith Barkley over 6 years ago in reply to JD Crutchfield

Guru 43955 points

No, I am referring to absolute max Tj. It is 150 C for epoxy devices. Whether you can get there with an MSP is another question. When I was working with 10 W plastic packaged power devices, it was easy. 8^)

For silicon, Tj can be limited by 2 things, the package or MTTF. In an air cavity package, you can get the TJ to whatever you want, but higher temperatures cause the metal to fail more quickly (cf Blacks Equation). So typically the part is designed to last 1 million hours at a Tj of 200 C.

0 JD Crutchfield over 6 years ago in reply to Keith Barkley

TI__Mastermind 30560 points

Hey Darren,

Here is the thermal information for the requested MSP430F1232IPW:

Theta JA = 72.8
Theta JC = 20.7
Theta JB = 31.3

Thanks,

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MSP430F1232: TJ - junction temperature max