LESS THAN STANDARD SEPARATION WHEN AN ACR-MLG WAS TURNED ONTO FINAL APCH COURSE TOO NEAR AN SMA ALREADY ESTABLISHED ON THE FINAL APCH COURSE.

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I TOOK HANDOFF ON SMA X FROM SE LEVEL AT 3000'. ALL TFC ON FREQ WAS FROM NW. MODERATE RAIN; LIGHT TO MODERATE TURB RPTED. WIND AT 3000' WAS 160/60. THE ARR SECTORS HAD GIVEN ME TFC ON OPP BASE LEGS AT 6000' ALONG WITH DOWNWIND TFC. I LET SMA X PASS ACROSS FINAL APCH COURSE INADVERTENTLY. THE ONLY EXPLANATION IS THAT I GOT INVOLVED WITH THE TFC FROM NW AND WAS DISTRACTED ENOUGH TO LET SMA X CROSS FINAL APCH COURSE. THIS ENTIRE SITUATION COULD HAVE BEEN PREVENTED HAD THERE BEEN 2 FINAL CTLRS. WHILE THE VOLUME NORMALLY WOULDN'T DICTATE 2 FINALS THE WIND; WX; AND TFC AT THE POINT WHERE IT WAS; DID WARRANT. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING INFO. RPTR WAS CALLED TO ASCERTAIN PROX OF TFC; CTLR EXPERIENCE LEVEL AND DETAILS OF INCIDENT. THE SMA WAS ON FINAL APCH ESTABLISHED ON THE LOC AT 3000'. THE MLG WAS TURNED ON; IN FRONT OF THE SMA; BUT NOT FAR ENOUGH IN FRONT TO PRESERVE THE SEP. THE SEP WAS LOST WHILE THE MLG WAS IN THE TURN TO FINAL DSNDING. RPTR RESTATED THAT TFC WORKLOAD WAS NOT HEAVY BUT ONLY SPREAD OUT OVER A FAIRLY LARGE AREA CAUSING HIM TO BE TRYING TO LOOK AT TOO GREAT AN AREA TO WORK THE TFC.