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Fourth terminal of this NPN model

Question asked by ren_zokuken01 on Mar 3, 2016
Latest reply on Mar 14, 2016 by sdgrant
From the library unzipped from $HPEEOFS_DIR\oalibs\componentLib\RF_Transistors_vendor_kit.7z, I found this model pb_phl_BFG135_19911011. This is one of the many NPNs in this library that have 4 terminals.

It seems to work just fine with only connecting the usual 3 terminals, but I've never actually seen a model like this. So, what's the 4th terminal for?