• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 263 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM96194 temperature sensor diode

prachi panse1
Intellectual 980 points
Other Parts Discussed in Thread: LM96194

Hi,

I found in the LM96194 datasheet, that the MMBT3904 transistor is recommended to be used as a temperature sensor diode.

Can you please explain to me why a BJT is preferred over a 2-terminal diode for this application? Also please let me know regarding the selection of MMBT3904 device.

Regards,

Prachi

  • 0
    Intellectual 980 points

    Hi,

    Could you please update me on my query?

    Regards,

    Prachi

  • 0
    TI__Expert 4905 points

    Hi Prachi,

    Regular diodes are not fabricated in the same way as the MMBT3904 transistor so their transfer function is different. Since pn junction can vary quite a bit based on device type (leakage current, speed, power rating etc.) when remote diode sensors were conceived it was found that the native PNP transistor found on a CMOS process could be made to follow the same characteristics as a standard 3904 BJT. Thus most remote diode sensors are tuned for the 3904.

    As for the selection of the 3904 just make sure you purchase the 3904 from a reputable supplier that has  good process control in place.


    Take care,