TMP275: what is the difference between these part number

Dear user4979989,

Thanks for posting.

Historically G4 and E4 suffixes meant “Green” or “Lead Free”. These standards have been phased in to most products TI currently offers, meaning a part without a G4 suffix would still be Green and Lead Free, and is the same physical part as the G4 equivalent offering.

As RoHS and Green offerings became standard in most parts, G4, or potentially E4 suffixes for a period of time were often still listed available for customers that needed a consistent orderable part number.

Texas Instruments G4 vs. no G4 suffix
Currently there is no difference between a part numbers for example: TMP275xxG4 and TMP275xx

Due to this standardization, TI has recently been in the process of slowly phasing the environmental code suffix out of the manufacturer’s part number. Going forward G4 / E4 markings are still included on the physical part marking and on the manufacturer’s label to the left of the 2D bar code but will not be included at the end of the manufacturer’s part number on the label.

For further information on what the G4/E4 suffixes mean can be found here:
https://www.ti.com/support-quality/environmental-info/logo-product-labeling.html