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Here's what a socket looks like for chip scale packages. Each one is custom made for a given chip package. A couple samples of the 0.4mm pitch Baochip CSP devices are laid out on the lower rim of the socket for size reference.

Baochip

@baochip.com

The socket mounts to the board with spring loaded contacts; the carrier board is also custom to the socket. You can see some of the chip test & measurement power supplies on the board near the socket. The socket itself is quite expensive, a couple thousand dollars and some weeks to manufacture.

31/1/26, 3:01 pm0 reposts9 likes

Baochip

@baochip.com

31 Jan

The socket has seen heavy use for initial device bring up and chip probe test development. However, its high cost and fragility limits its use to just the earliest bring up phases. If you are a lucky dabao Alpha board owner, the chip on that board was tested and programmed in this very socket!

Baochip

@baochip.com

31 Jan

This is what the socket looks like with the lid closed!