My samples came in today. At first I thought, dang these are small and probably rather fragile. But then I tried to stick them together and pull them apart. Wow, was I surprised. It takes some doing to pry them apart. I wouldn’t recommend using an iron on these because the tail is just too small. That’s not to say you can’t: if you make the footprint right, then you’ll have a relatively larger solder pad available to you. You can heat up the pad and let the pin settle in it … you’ll just have to do it with all four at about the same time, otherwise you’ll end up twisting the thing. Reflow should be no problem. And while TE says the plastic can withstand high temperatures, I’d still cover it up with Kapton before using hot air. Either way, I’m going with these!
They are called “Hermaphroditic Blade and Receptacle Connectors” from TE Connectivity. Part number: 1971567-2.
These are NOT designed to go on a strip. They are meant go on a rigid PCB with no movement. However, they do appear to match the pads on those strips that have 4 exposed pads if you want to try.
If you’re just joining them together like they were originally, just put solder on the pads on one strip, place the other one ontop and heat the pads up again. If you are adding distance between the pieces, wires is the way to go.
There are specific connectors for that: http://m.aliexpress.com/search.htm?keywords=led%20strip%20connector
Then get the proper wires. You won’t find connectors for 3 pins, but you will find JST connectors with wires: http://www.aliexpress.com/item/50-Pair-3-Pin-JST-SM-Connectors-For-WS2812B-WS2811-WS2812-LED-Strip-Female-Male/1616627523.html