The TE Connectivity 1-770849-7 is a 17-circuit, single-row receptacle housing from the SL-156 series, built for wire-to-board or wire-to-wire harness applications where the 0.156" (3.96mm) pitch gives enough spacing for 18-24 AWG crimp terminals without crowding the connector face.
Pitch, Positions, and the BOM Fit
At 17 positions, this housing matches a 17-circuit BOM line exactly; stepping down to a 16-position sibling would leave an unused header pin, while an 18-position housing would require a wider board footprint.
Locking Ramp and Polarizing Key — Field-Service Details
The polarizing key on the housing interior aligns with a corresponding slot on the header — this mechanical keying prevents inserting the housing backwards or into a different-series header, a real risk in multi-connector harness assemblies where several SL-156 variants share the same pitch.