What does the "F" indicate on the PAD series headers?

Example part numbers:

B10B-PADSS (LF)(SN)
B10B-PADSS-1 (LF)(SN)

Compared to...

B10B-PADSS-F (LF)(SN)
B10B-PADSS-1F (LF)(SN)

The difference is the raw material resin used. Without the "F", it is glass-filled PBT. With the "F", it is PA66.

Those WITHOUT the "F" added are discontinued.

Only those with the "F" are now promoted due to quality issue with those without the "F".