LM393B: LM393B:

Hello Sagar,

The input voltage limit of the LM393B is Vcc-2V, or +3V on a +5V supply.

If the hall sensor output is capable of outputting >3V, then it will violate the LM393 input range.

Please see section 6.4 of the LM339 family application note:

 Application Design Guidelines for LM339, LM393, TL331 Family Comparators

There is also the possibility of using the LM393LV, which has a R-R input and should work fine.