SN74CBTLV3257: function temp double check

Hi Chi,

The ambient temperature has a rating of 85C max for this device. If the ambient temperature around the IC is greater than 85C it breaks the IC spec. 

To calculate the mux's junction temperature during operation use the following equation:

The Thermal Resistance can be found in the mux datasheet and it dependent on package - please see below

In Most Applications of the mux the junction temperature will increase very slightly from the ambient. 

However, I don't know if this is exactly what you are looking for - if not I apologize!  If you could please clarify  my following questions I will be able to help pin down what exactly you are looking for!

1. Does the socket have a max temperature of 105C?
   
   
   
2. Or do you want to use the mux in a system with 105C operating temperature? 
   
   
   
3. What Package of the SN74CBTLV3257 are you using?

Please let me know!

Best,

Parker Dodson

Hi, Parker

thanks for your temp equation

for your question, here is my inputs:

1. 3257 will be used in system temp around 100C, calculate to junction temp will be 105C, so customer want to check if we have the version form -25 to 125C.

2. SN74CBTLV3257DBQR is the using package

3. EP version is TSSOP, not the same package with DBQR-SSOP

TI, Nexperia and Diodes are in the same AVL code, and our competitor Nexperia could support 125C, do we have any update version? if not we may lose the opp.

BR,

Chi