Board-Stacking Interconnect for Dense Mezzanine Designs
The Molex 5009130502 is a 50-position receptacle from the SlimStack 500913 series, designed for board-to-board mezzanine stacking at a 0.40 mm pitch. With two rows of gold-plated contacts and a mated stack height of 1.8 mm, it pairs with the matching SlimStack header to route dense signal arrays between parallel PCBs in space-constrained enclosures.
What the 0.40 mm Pitch and 1.8 mm Stack Height Mean for Your Layout
The 0.40 mm pitch is the tightest common spacing for mezzanine connectors — it packs 50 signals into a roughly 10 mm board edge, but forces fine-line PCB routing (trace/space below 0.15 mm typical) and a controlled-impedance stack-up if used for high-speed differential pairs. The 1.8 mm mated stack height sets the z-height budget between the two boards; at this height, the connector suits ultra-slim portable devices, camera modules, or any assembly where the board gap is under 2 mm. Gold plating at 8.00 µin on the contact finish supports repeated mating cycles — useful if the boards are separated during test or field service. Tin plating at this pitch would gall after fewer cycles; gold keeps contact resistance stable through multiple mates.
Solder Retention for Reflow Reliability
The solder retention features on this SMT receptacle hold the part in place during reflow, preventing the connector from shifting or tombstoning on a dense 0.40 mm pitch footprint. This is a practical detail for high-volume pick-and-place assembly — without it, the narrow pitch makes alignment critical.