Vehicle-mounted electronic module, card edge connector, and connector

Abstract

There is a problem that an oxide film or high resistance abrasion powder is formed at the contact interface due to micro sliding abrasion in a high temperature environment or temperature cycle to increase the contact resistance at the contact portion of a non-noble metal connection terminal. Provided is an in-vehicle electronic module, a connector, and a connection structure thereof, which have the same connection reliability as noble metals even when exposed to a harsh environment and can reduce cost of members. The in-vehicle electronic module includes a circuit board on which an electronic component is mounted, and a protection member accommodating the circuit board and protecting the circuit board from a surrounding environment and has a structure where a surface layer at an end portion of the circuit board is made of an 1 Ag-containing Sn-based solder having average thickness of 4 μm or more, and a surface material of a connection terminal of one card edge connector has a two layer structure of a soft noble metal layer of Ag, Pd, Pt, or the like/a reaction layer of a hard noble metal and Sn or an Ni layer.