Deductions & credits

do i need to file form 3520 if the gift received is less than $100,000 from a foreign person?

No.  If the amount received as a gift from a foreign individual is less than $100,000, the Form 3520 is not required.

IRS Form 3520 instructions - https://www.irs.gov/pub/irs-pdf/i3520.pdf

4. You are a U.S. person who, during the current tax year, received either: 
a. More than $100,000 from a nonresident alien individual or a foreign estate (including foreign persons related to that nonresident alien individual or foreign estate) that you treated as gifts or bequests; or
b. More than $15,601 from foreign corporations or foreign partnerships (including foreign persons related to such foreign corporations or foreign partnerships) that you treated as gifts.