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Testing Connectors

A project log for EEEmu SPI

25MHz 1.8-5V SPI EEPROM/Flash Emulator

Blecky 06/11/2017 at 08:230 Comments

I've been recently looking for a cheap supply of USB and SD card mounts/connectors to bring the costs of the board down (some SD card mounts from other manufacturers are a few dollars each even in large quantities). I found what seems to be a decent supplier of all different connector styles from 4UCON, however they took a while to send samples, because they normally do business in larger quantities. They eventually shipped and arrived in the end.

From left to right the part numbers are 15882, 20696 and 11071.

The only downside if that they don't have much in the way of datasheets, only that we can assume the plastic insulator is a Liquid Crystal Polymer (LCP) with a UL94V-0 flammability rating (with the 11071 connector being LCP with glass fiber).

So what sort of characteristics or tolerances do these connectors have under reflow conditions?

So let's see how they go:

They survived quite well, without the plastic melting or becoming brittle:

Not bad for a spring loaded SD card slot that costs about $0.28 and USB connector that costs $0.08 each (in quantities of 1000).

The reflow oven I used is a toaster oven conversion I did with a Controleo2 and Sunbeam BT2600. Here's a video of it in action:

Here's the profile of the oven:

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