If you have observed an unexpected feature - an extra rib - on the 0533750310 header connector from Molex which was not present in your original sample, here is the explanation from the manufacturer:
The manufacturer, Molex, has clarified that a Certificate of Compliance (COC) issued in 2022 confirmed the part met standard requirements and was suitable for use.
The difference is related to the mold shape: the old mold has no rib, while the new mold includes the rib.
Molex has confirmed that there is no issue with the mating condition.The purpose of the rib is to strengthen the mold from a manufacturing perspective, particularly for longer circuits (over 4 circuits).
Applicable Part Numbers
WM9816-ND
0533750310
053375-0310
533750310
53375-0310
WM9816
0533750310-ND
2266-533750310-23
Related Documents: Molex Korea COC_533750310 Mold shape difference_220622.pdf (352.8 KB)