Other Parts Discussed in Thread: LM2903, LM339, LM393LV
When LM2903 is powered by 5v, v+=4v, what is the maximum voltage of v-?
What is the maximum voltage of v+, v- when LM2903 is powered by 5v?
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When LM2903 is powered by 5v, v+=4v, what is the maximum voltage of v-?
What is the maximum voltage of v+, v- when LM2903 is powered by 5v?
Hello Xiaofu,
The LM2903 has a input limit of Vcc-2V, or 3V on a 5V supply.
Please see the LM339 family application note, section 3.4:
Application Design Guidelines for LM339, LM393, TL331 Family Comparators
Since it is a 5V supply, please see the LM393LV, which is a drop-in replacement and has a R-R input and can accept inputs up to 5V.