**Part Number:**SN74HC257

**Other Parts Discussed in Thread:**CD74HC4075, , SN74HC86

Hi Team

I understood logic's Tj(max) will be typically 150℃ unless otherwise specified in datasheet from following E2E link.

Just want to double-check with you.

Is it correct that all SN74HC257, CD74HC4075 and SN74HC86 have 150℃ Tj(max)? Thanks.

Customer want to compare the maximum power dissipation to other company's logic, so they are trying to use "Pd=（Tj(max)-TA）/θJA" to calculate maximum power dissipation.

Please also let me know if this formula is not correct.

"For logic devices, **T _{J(max)}** is equal to the maximum storage temperature (

**T**) as listed in the

_{stg(max)}**Absolute Maximum Ratings**table of the datasheet, unless otherwise specified. This value is typically 150°C."

Thanks.

Regards,

Jo