What this 4-position FFC connector does
The 04FMN-BMTTN-A-TF is a 4-position, 0.039" (1.00mm) pitch FFC connector from JST's FMN series, terminated by solder to a surface-mount pad and mated vertically to a 0.30mm-thick FFC cable. Rated 0.5A per contact at 50V, it handles low-power signal or control lines in tight board-to-flex applications. The Low Insertion Force (LIF) design reduces wear on the FFC pads during repeated mating cycles, a practical advantage in field-service scenarios where the cable is swapped more than once.
Board-fit and routing details
A vertical SMD orientation with a 5.10mm height above board leaves a low profile for clearance under adjacent components or enclosure lids. The housing is black polyamide (PA6T) rated UL94 V-0, and the contacts are tin-plated phosphor bronze — adequate for moderate environments but not for high-vibration or corrosive atmospheres where gold plating would be preferred.
Note: This part is listed as RoHS non-compliant, which may affect compliance documentation for certain markets.
How it compares to nearby siblings
Compared to the 04FMN-BMT-A-TF(LF)(SN), the 04FMN-BMTTN-A-TF shares the same pitch, height, current rating, and contact finish — the difference is in the packaging suffix and RoHS compliance status. The 04FMN-SMT-A-TF is a right-angle SMD variant with a lower 3.00mm stack height, useful when the FFC must exit parallel to the board rather than vertically. If you need one more circuit, the 05FMN-BMTTN-A-TF offers the same footprint and ratings with 5 positions.