Analog Devices uses several suffixes that represent lead and lead free as well as packaging. Here is a quick breakdown.
#TR - Stands for standard reel quantity of tape and reel parts that are NOT lead free.
#TRM - Stands for a special reel quantity of 500 tape and reel parts that are NOT lead free.
#TRPBF - Stands for standard reel quantity of tape and reel parts that ARE lead free.
#TRMPBF - Stands for a special reel quantity of 500 tape and reel parts that ARE lead free.
Please see the following document from Analog Devices for complete reel specifications Tape and Reel LTC (analog.com)