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TMP235-Q1: TMP235-Q1 NC pin connection

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Replies: 4

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Part Number: TMP235-Q1

Hi Experts,

My customer wants to switch from LMT87-Q1 to TMP235-Q1 for faster thermal response. Due to the layout is already fixed, can TMP235-Q1 be direct replacement of LMT87-Q1? 

The TMP235-Q1 has two NC pins (pin 1 and 5), is there any negative effect if connecting these two pins to VDD (LMT87-Q1 pin 1 & 5 are VDD pins)

Thank you.

Best Regards,

Wei-Hao

 

  • Dear Wei-Hao - 

    The N/C pins on the TMP235 can be left floating or connected to GND.

    Does the customer actually need to change parts? Did the customer check response time of the DCK package in their application? (the response time of the LMT87-Q1 in the datasheet is for the LPG package. 

    Also, the LMT87 has negative slope output whereas the TMP235 has a positive slope - if the customer already did firmware to support LMT87, they will need to change it if they move to TMP235. 

    BR-

    Josh

  • In reply to Josh Wyatt:

    Hi Josh,

    Thanks for your reply. Do you have the thermal response time curve for LMT87-Q1 in DCK package? I cannot find it in the datasheet

    Thank you.

    Best Regards,

    Wei-Hao

  • In reply to Wei-Hao Chen (TW-FAE):

    Hi Wei-Hao,

    Thermal response is dependent on the package. This spec can be found in the TMP235-Q1 datasheet which is a direct replacement for the LMT87-Q1.

    The DCK package thermal response spec is 1.3 seconds. 

    Jalen

  • In reply to Jalen Tate89:

    Hi Jalen,

    Got it, thanks.

    Best Regards,

    Wei-Hao

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