Post 2016
all MAX3421 are version 3
Prior to 2016
some ICs are die version 3. Those are marked with 3 as below:
MAX3421EEYYWW3 (YY-> Year, WW-> Workweek (0 to 52), example for 2016, YY = 16)
OR
MAX3421EETJ YYWW3
Source: MAX3421 Errata, Document ID No. 19-0647; Rev 2; 4/16
Note: The version of the MAX3421E can be determined electrically (by firmware) by reading the Die
Version register (R18); e.g., 0x01 is version 01, 0x12 is version 02, 0x13 is version 03. The die may also be
discovered by reading the top mark as described below.
Version register (R18); e.g., 0x01 is version 01, 0x12 is version 02, 0x13 is version 03. The die may also be
discovered by reading the top mark as described below.