TPS60403-Q1: Operating temp and junction temp difference between non-Q1 and Q1 device

Yoshiki Ochi

Part Number: TPS60403-Q1
Other Parts Discussed in Thread: TPS60403

Hi team,

1) Non-Q1 and Q1 devices 7.5 Electrical Characteristics test condition especially for temperature range looks different each other. Why they have the same recommended TJ but different
2) Non-Q1 recommended operating junction temperature is -40C<TJ<125C but PACKAGING INFORMATION Op Temp says -40C<"Txxx"<85C, why? Which kind of temperature parameters "Txxx" does PACKAGING INFORMATION Op Temp mention?
3) Could we use Non-Q1 device with -40C<TA<125C? Datasheet ES test condition says TC = -40°C to 85°C but -40C<recommended operating TJ<125C. Is there any concern if we use non-Q1 device @-40C<TA<125C?

Lower shows datasheet specification

TPS60403-Q1: "7.3 Recommended Operating Conditions" says "-40C<Operating junction temperature<125C", "7.5 Electrical Characteristics" is within TJ = –40°C to 125°C, and "PACKAGING INFORMATION" says "Op temp" is -40C to 125C

TPS60403 : "7.3 Recommended Operating Conditions" says "-40C<Operating junction temperature<125C", "7.5 Electrical Characteristics" is within TC = -40°C to 85°C, and "PACKAGING INFORMATION" says "Op temp" is -40C to 85C

Regards,
Ochi

over 2 years ago

+1 Stefano Panaro over 2 years ago

TI__Expert 7585 points

Hi Ochi-san,

Thanks for your question.

I believe the main difference is in the parameter specifications.

I believe that the 85C usually refers to the Maximum Case Temperature (Tc), whereas the 125C usually refers to the Maximum Operating Junction Temperature (Tj).

You can refer to Semiconductor and IC Package Thermal Metrics (Rev. C) (ti.com) section 7, for further details about these definitions.

Please consider that both Tj and Tc are different from Ta (ambient temperature).

To compute the maximum Ta (that would be always lower than 125C), please refer to the section 'Power dissipation' (9.2.xx) of the respective device datasheet.

Please ask again if you have further questions.

Thanks,

Stefano

0 Stefano Panaro over 2 years ago in reply to Stefano Panaro

TI__Expert 7585 points

Hi Ochi-san,

Do you have any further questions?

Otherwise we can close this thread.

Thanks,

Stefano

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TPS60403-Q1: Operating temp and junction temp difference between non-Q1 and Q1 device