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Difference between MAX3221IPW and MAX3221IPWG4

Other Parts Discussed in Thread: MAX3221

Dear Team,

I'm studying the datasheet of the MAX3221, and I see 2 different orderable devices : MAX3221IPW and MAX3221IPWG4.

see the extract of the data sheet below:

Orderable Device Status Package Type Package Drawing Pins Package Qty Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking
MAX3221IPW ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM - -40 to 85 MB3221I
MAX3221IPWG4 ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM - -40 to 85 MB3221I

What is the difference between the MAX3221IPW and the MAX3221IPWG4 I have tried to find it in the datasheet but I must be overlooking.

datasheet: 

www.ti.com/.../max3221.pdf