306-027-521-178

Overview

The EDAC Inc. 306-027-521-178 is a dual-sided card edge connector from the 306 series, featuring 54 positions with a 0.156-inch (3.96mm) contact spacing. It utilizes gold-plated cantilever contacts for reliable signal transmission. The unit supports printed circuit boards with thicknesses ranging from 0.054 to 0.070 inches (1.37mm to 1.78mm). Designed for panel and through-hole mounting, it includes flange features such as flush installation, top openings, and threaded inserts compatible with 4-40 screws. The insulator is constructed from thermoplastic polyester, ensuring stability across an operating temperature range of -40°C to 105°C.

Feature Summary

• Dual-sided configuration with 54 gold-plated cantilever contacts
• Panel mount design with integrated card guide rails
• Flange features include flush installation and 4-40 threaded inserts

Applications

• Industrial control systems requiring robust board-to-board connections
• Telecommunications equipment utilizing standard card edge interfaces
• Test and measurement instrumentation panels

Procurement Notes

Verify that the target PCB thickness falls within the specified 0.054 to 0.070 inch range to ensure proper contact engagement. Confirm that the mounting holes align with the 4-40 threaded insert specifications on the flange. Check for RoHS3 compliance requirements if environmental regulations apply to the final assembly. Ensure the connector orientation matches the dual-sided layout in the system design.

Selection Notes

Select this component when high-density interconnects are needed with a 3.96mm pitch. The 306 series offers versatile mounting options compared to standard headers. Consider the green color coding if visual identification aids in assembly processes. Verify that the cantilever contact type provides sufficient retention force for the specific vibration environment of the application.

Part Context

This part belongs to the EDAC 306 Series, which specializes in card edge connectors with various row configurations and mounting styles. The series is known for accommodating different board thicknesses and providing secure mechanical retention. The 306-027-521-178 specifically addresses applications requiring a high pin count with a larger spacing standard.

Replacement Considerations

Direct substitutes within the same series include parts like 306-027-521-112 or 306-027-521-158, though position counts may vary. Cross-series replacements require matching the 0.156-inch pitch and dual-sided contact arrangement. Always verify mechanical dimensions and electrical ratings before substituting.