60-Position Backplane Header for High-Density Signal Routing
The TE Connectivity 2057427-3 is a 60-position header in the Impact series, arranged as 10 columns by 6 rows at a 0.075" (1.91mm) pitch. This is a signal-only backplane connector — the 0.075A per-contact rating tells you it's sized for differential pairs and low-current logic lines, not power delivery. The contact layout is 40 signal positions with 20 dedicated ground contacts integrated into the same body, giving each signal column a ground reference for controlled-impedance routing. Termination is press-fit through-hole, which means this header presses into plated backplane holes without solder — the compliant pin cold-welds to the barrel. That's the standard for high-reliability backplanes where rework, field replacement, or lead-free assembly constraints rule out wave solder.
The press-fit termination requires a specific hole size and PCB thickness — the compliant pin is designed for a controlled interference fit. No solder paste, no wave, no reflow. This connector feeds into a backplane assembly line where the header is pressed into the board with a pneumatic or hydraulic press. The 6-row, 10-column layout means the insertion force adds up; the board needs adequate support under the press area to avoid flexing.
Contact Plating and Signal Integrity
The 20 ground contacts are distributed across the layout to provide a low-inductance return path, which matters when the signal edges are fast enough that the ground plane in the PCB alone isn't enough. This header mates with the Impact series right-angle receptacle; the mated pair defines the stack height and the differential impedance.