Sourcing dupont (2.54mm pitch) reflow compatible pin headers - Page 1
Forum section: electronics / general

author: zerohimself
author_rank: Contributor
timestamp: May 11, 2020, 05:22:54 am
content: So, one of my products i carry requires right angle 2.54mm pitch 2*20 pin dupont headers (sorry about my lack of proper names!!) such as these:https://www.aliexpress.com/item/32979672214.htmlThe product was designed without manufacturing in mind, and we currently make them all by hand. Due to the unique layout and design not intended for mfg, it requires one of those headers to be soldered in place before the SMT components can be placed and reflowed.Due to external circumstances, A redesign of the PCB is almost out of the question. So, I am wondering if anyone knows where/how I can get some of these pin headers that will survive a SMT reflow process.I'm not asking for advice on the adapting the current design, i'm doing research to figure out if I can make it viable to pick and place then reflow the current design after attaching the pin headers.Here is an image, i think you will see why it is difficult.

author: tszaboo
author_rank: Super Contributor
timestamp: May 11, 2020, 07:48:27 am
content: SamtecWürthTE-Connectivitymakes them, among million others. Dupont was a terrible choice of naming that the Chinese sellers choose for these so called "rectangular board to board connector, header".

author: Siwastaja
author_rank: Super Contributor
timestamp: May 11, 2020, 08:28:58 am
content: Keywords:Female pin headerFemale headerBoard-to-board female headerDupont and IDC are common misnomers that may work on Ebay but make sourcing them harder.Most general-purpose connector manufacturers make them. With pin headers, though, I make my only exception to the "source everything from Digikey/Mouser/similar" rule; I'm not going to pay $1 for a ridiculously simple header when I can get it for $0.10 from Aliexpress, and I have never had any problems with the Chinesepin headers, the contant surface seems OK and the plastic can withstand reflow temperatures; at the same time, proper JST products have melted in reflow.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: May 11, 2020, 08:29:59 am
content: Why not go for SMD and do dual sided SMT assembly? That save more time and money.And what they need probably is to add glue to hold the heavy connector if they were there first to go through the oven.

author: SMTech
author_rank: Frequent Contributor
timestamp: May 12, 2020, 08:40:28 am
content: I'm not sure you will find a pin-in-paste compatible right angled socket strip, your best bet might be to see if you can find a right angled surface mount one that just happens to line up with your holes. Of course the real solution is the one you don't want, redesign to use an SM connector in the first place.If these weren't double row Id say solder them from the topside.

author: zerohimself
author_rank: Contributor
timestamp: May 12, 2020, 04:51:47 pm
content: Yeah, I figured I was being a little too hopeful! I think I will attempt to make a shield to protect it from the heat, and hopefully I will be able to run it through the oven without it getting melty! If not, at least i can PnP the components and reflow by hand.

author: TIOUK
author_rank: Contributor
timestamp: May 13, 2020, 11:44:06 am
content: I have found toby.co.uk very helpful. Good range of connectors.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: May 14, 2020, 11:44:12 pm
content: Find what you are after on Digikey:https://www.digikey.com.au/en/resources/connectors/indexThen once you have a part number search it up on OctoPart to see who else stocks it:https://octopart.com/

author: zerohimself
author_rank: Contributor
timestamp: May 23, 2020, 06:23:33 am
content: Quote from: ANTALIFE on May 14, 2020, 11:44:12 pmi've spent countless hours trying to find reasonably priced headers on DK.. the only ones i found are about 20x more expensive than the ones on aliexpress, and the same insulator material that doesn't hold up. I didn't just come here hoping for someone else to do work for me. I was hoping maybe I missed something with my inexperience. But I still can't seem to find ANYONE that makes these through hole headers that can withstand a reflow.

author: l0wside
author_rank: Regular Contributor
timestamp: May 23, 2020, 09:06:27 am
content: Have you gone through the manufacturer‘s sites? I would start with Samtec, the site is not bad. IIRC, at least Samtec sells directly, tooThe combination of „must fit my exotic requirements“ and „must not cost a dime“ is not very likely to work.