3.5 mm TRRS Audio Jack for Board-Edge Audio
The Amphenol FCI 10038075-A1PLF is a 3.50 mm industry-standard mini phone jack, configured as a female surface-mount connector with a right-angle orientation. It carries 4 conductors across 5 contacts — a TRRS (Tip-Ring-Ring-Sleeve) layout with an additional switching contact that opens or closes when the plug is inserted. The 0.142" (3.60 mm) actual diameter accepts standard 3.5 mm audio plugs used in headphones, headsets, and portable electronics. The black PA9T housing includes a board guide to align the part during pick-and-place, and the contacts are silver-plated brass and phosphor bronze, rated for 1 A per circuit.
Contact Configuration and Switching
The 4-conductor, 5-contact arrangement means this jack has a normally-closed switch on one of the signal paths — the single internal switch disconnects the internal speaker or microphone path when a plug is inserted. This is the standard TRRS switching scheme for mobile audio and headset applications. The silver plating on the contacts provides adequate conductivity for audio-frequency signals and holds up well against the moderate insertion cycles of consumer devices.
Mounting and Assembly Fit
The board guide feature helps keep the connector aligned during reflow, reducing tombstoning or skew.