TLC7226: Thermal resistance and maximum junction temperature

Hi Uttam,

Thank you for the reply. May I know if Table 4 in the document is applicable to TLC7226 as well? If so, can it be interpreted that the absolute max Tj for the component is 150°C?

Regards,

Chen

Hi Chen,

This document is generic. For ABS max limit, please follow the datasheet. As per the datasheet, the max junction temperature is dependent on different suffixes. Please refer to that.

Hope that answers your question.

Regards,

Uttam

Hi Uttam,

The datasheet given value is max operating ambient temperature. Is the max Tj the same value as max Ta for this component?

Regards,

Chen

Hi Uttam,

The datasheet given value is max operating ambient temperature. Do you mean that the max Tj for this component is the same value as max Ta?

Regards,

Chen

Hi Chen,

The Tj is not the same as Ta. As the storage temperature is specified as max 150 oC, I can assume that the normal Tj should be able to go up to the same value. But due to the lack of information, I would recommend providing a sufficient margin when considering the max Tj. The safest option is to consider 125 oC as the max Tj. If that doesn't work out for your design, allow only around 10oC temperature rise above ambient, which will make the max Tj as 135 oC. 

Hope that answers your question. Sorry for not being able to provide a very definitive answer.

Regards,

Uttam

Hi Uttam,

No worries, I just need to be sure that I am using the right numbers. To clarify, do you mean to estimate Tjmax by Ta_max + 10°C?  As the component I am using is TLC7226I, from datasheet it only has a max Ta of 85°C, so the maximum safe estimate for Tjmax is 95°C?

Thank you.

Regards,

Chen