What the 3-643815-9 Is — TE MTA-100 IDC Receptacle
The TE Connectivity 3-643815-9 is a 9-position IDC receptacle from the MTA-100 series, designed for mass-termination to 26 AWG discrete or ribbon cable without stripping the insulation. The 0.100" (2.54 mm) pitch matches the standard MTA-100 header footprint, making this a direct mate for the male pin headers in the same series. The blue closed-end housing with a locking ramp provides positive retention — the ramp engages the header latch and gives an audible click when fully seated, which matters in harness or field-service applications where vibration can back out an unlamped connector.
9 Positions at 0.100" Pitch — Fit and Footprint
The 9-position count is the BOM line match — confirm your circuit count before committing. The 0.100" pitch is the standard MTA-100 spacing, so the receptacle footprint is identical to any other 9-position MTA-100 header. The single-row layout keeps the connector narrow, fitting into tight board-edge locations. The closed-end design means the housing blocks the last cavity — no wire can be inserted into position 9, which is a deliberate keying feature to prevent mis-mating with a 10-position header.
IDC Termination — How It Connects
This is an IDC (Insulation Displacement Connector) receptacle — the 26 AWG wire is pressed into the contact slot, where the sharp tines pierce the insulation and grip the conductor. No stripping, no crimping, no soldering. The free-hanging, right-angle mounting orientation means the cable exits at 90° to the connector axis, which is useful for routing along a board edge or inside a shallow enclosure. The tin-plated contacts carry 80.0 µ" (2.03 µm) of tin — a heavy plating that handles the wiping action of IDC termination and provides corrosion resistance in indoor environments.
Mating — Works with MTA-100 Headers
This receptacle mates with any standard MTA-100 male pin header of the same 9-position count and 0.100" pitch. The locking ramp on the receptacle engages the latch on the header — look for the mating header with a locking ramp or detent feature. The closed-end design prevents mating with a 10-position header, which is intentional keying. For ribbon cable applications, the IDC termination accepts standard 0.100" pitch ribbon cable — the 26 AWG wire gauge is specified for the contact slot.