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Neopixels and Reflow Soldering
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Neopixels and Reflow Soldering

by montylaxer on Fri Sep 18, 2015 4:42 pm

Hello,
I've been looking at these neopixels (https://www.adafruit.com/products/2375) Cool White LED w/ Integrated Driver Chip.

I plan on using quite a few of these LED's, or something similar, and currently I'm devising a way to solder all of these. I'm just wondering if anyone here knows the max temp that these LED's can handle?

The game plan as of right now is to use a toaster oven to reflow solder the components, and just want to make sure I don't damage them in the process.

any help would be greatly appreciated!

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Re: Neopixels and Reflow Soldering

by adafruit2 on Sat Sep 19, 2015 2:44 pm

We don't have a spec sheet for that in specific but basically as-low-as-you-can-get-away-with-240* is what we found works best

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Re: Neopixels and Reflow Soldering

by montylaxer on Fri Sep 25, 2015 1:45 pm

alright, thanks!

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Re: Neopixels and Reflow Soldering

by montylaxer on Fri Sep 25, 2015 1:46 pm

alright, thanks!

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Re: Neopixels and Reflow Soldering

by loxodrome on Sat Oct 10, 2015 2:34 pm

Monty-
Did the Toaster work??
Or did you do some other method

-Jon

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Re: Neopixels and Reflow Soldering

by montylaxer on Tue Oct 13, 2015 2:30 pm

hey Jon,
haven't gotten around to it just yet, but I will keep you posted when I do.
So far I've been testing different jigs for holding the LED's and wire in place. The Toaster should be happening in a month or so. But from my research it seems like even using a standard toaster oven (monitored properly for semi accurate temperatures) should do the trick nicely. I've been able to hand solder my tiny LED's (I've moved on to the smallest i can find, about 1mm x 2mm) without problems so far, but needing to do 400 or more is why I'm looking for quicker methods.

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Re: Neopixels and Reflow Soldering

by slight on Wed Mar 16, 2016 2:52 pm

in 2015 i solder about 50 of the APA102
i used a hot air rework station and solder paste.
for me that did not worked so well... about 10 leds cracked during soldering. with cracked i mean the silicon encapsulation cracked - so most of the time the leds did not work any more..
i think that was moisture in the leds. so for a safer result it would be good to bake theme before soldering. (because they are not delivered in a moister-sealed back..)
for example nichia recommends 65°C for >= 24h as baking parameters. (source: datasheet NSSM124 SMD rgb led - page 14)

the photo shows one of the APA102 after de-soldering because of the crack in the encapsulation..
P1540404_crop.JPG
APA102 with crack in encapsulation silicon
P1540404_crop.JPG (256.28 KiB) Viewed 466 times


sunny greetings
stefan

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