Author Topic: Flat "DIP IC" pins for PCB-based IC?  (Read 1340 times)

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Offline visrealmTopic starter

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Flat "DIP IC" pins for PCB-based IC?
« on: October 10, 2024, 12:19:45 am »
Hi all,

I'm wondering if there is anywhere you can purchase DIP-IC-like pins for a PCB-based project which is designed to replace a retro IC?

I build these replacement RP2040-based TMS9918 VDPs:

...and currently I'm using turned pin headers which work fine, but would be great if you could buy flat IC pins instead.

I've searched to no avail. Any ideas?

Cheers
Troy

 

Offline Alex Eisenhut

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #1 on: October 10, 2024, 12:59:32 am »
Yes, you absolutely can, that question pops up regularly, I have them on my desk, and every. single. time. I forget what they're called.

Except tonight, I guess.

http://www.dasarodesigns.com/product/batten-and-allen-ba3760-dill-leadframe-dip-pcb-edge-clip-pins/

(DIL, not dill, although that sounds delicious)

Just google "lead frame dil edge pins" and take it from there.
Hoarder of 8-bit Commodore relics and 1960s Tektronix 500-series stuff. Unconventional interior decorator.
 
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Offline PCB.Wiz

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #2 on: October 10, 2024, 01:59:43 am »
...and currently I'm using turned pin headers which work fine, but would be great if you could buy flat IC pins instead.

For this problem in the past, we've used 'sacrificial' standard DIP sockets as 'converters' from headers to flat pins, that can go into standard IC sockets.
They also help protect the fragile turned pin headers.
 
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Offline visrealmTopic starter

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #3 on: October 10, 2024, 02:41:07 am »
Thanks Alex and PCB.Wiz.

I found some similar at Digikey. It seems "Leadframe" is keyword.

I like the socket idea too, but it increases the stack height a bit which might be a problem for some.
 

Offline Alex Eisenhut

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #4 on: October 10, 2024, 03:40:09 am »
Thanks Alex and PCB.Wiz.

I found some similar at Digikey. It seems "Leadframe" is keyword.


Careful, that's a SIL, like how SIPP memory modules were.

https://en.wikipedia.org/wiki/SIPP_memory

Might be useful if you're trying to make a Commodore 1541 hybrid module.

Hoarder of 8-bit Commodore relics and 1960s Tektronix 500-series stuff. Unconventional interior decorator.
 
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Offline visrealmTopic starter

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #5 on: October 10, 2024, 05:08:46 am »
Careful, that's a SIL, like how SIPP memory modules were.

https://en.wikipedia.org/wiki/SIPP_memory

Might be useful if you're trying to make a Commodore 1541 hybrid module.

Right you are. I could see it working, but it would be a bit... weird. Thanks.
 

Offline jonpaul

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #6 on: October 10, 2024, 05:51:43 am »
An Internet Dinosaur...
 

Offline ebastler

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #7 on: October 10, 2024, 06:57:37 am »
Samtech
https://www.samtec.com/flex-stacking/

Those all seem to be big fat square pins which will widen/damage IC sockets when inserted?
 

Offline ebastler

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #8 on: October 10, 2024, 07:03:42 am »
http://www.dasarodesigns.com/product/batten-and-allen-ba3760-dill-leadframe-dip-pcb-edge-clip-pins/

(DIL, not dill, although that sounds delicious)

Just google "lead frame dil edge pins" and take it from there.

Those pins which sit on the edge of the PCB are the "industrial" solution, I guess. But they won't allow you to sneak a trace or two inbetween the pins and the board edge -- neither on the top or bottom of the PCB. The design the OP shows does seem to use such traces in its routing. (On the other hand they should work nicely for multilayer PCBs, not blocking any real estate on the inner layers.)

There used to be a neat solution called "Flip Pins" -- individual flat pins stamped from sheet metal, held in plastic strips for easy assembly. I have used them in a few projects, but believe the guy who made them has discontinued this product. Not sure whether they are still available somewhere; this page has a description and a few links as starting points: http://oshchip.org/products/Flip-Pins_Product
 

Offline Alex Eisenhut

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #9 on: October 10, 2024, 10:23:52 pm »
Right you are. I could see it working, but it would be a bit... weird. Thanks.

Not at all, people don't realize SMT came before DIP packages... You can make these:

https://en.wikipedia.org/wiki/Flatpack_(electronics)#

BTW I don't really know what you're building but I commend you on taking the time to look into this solution. It's neater, and "correct", and obviously meant to work with DIP sockets. I see too many DIP-pluggable things with .100 header strips and it hurts my little nerd heart every time I see that.

The only annoying thing is, and it's a big one, is you need to trim these pins somehow. I don't think there are any ready-made DIP lead slicers out there that could fit on a kitchen counter either.


this page has a description and a few links as starting points: http://oshchip.org/products/Flip-Pins_Product

Very interesting.
« Last Edit: October 10, 2024, 11:23:29 pm by Alex Eisenhut »
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Online Benta

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #10 on: October 10, 2024, 11:06:22 pm »
I think these are what you're looking for:
https://www.te.com/en/plp/leadframes/Y30nn.html?n=42057&d=544927
They need to be cut after mounting.
« Last Edit: October 10, 2024, 11:09:46 pm by Benta »
 
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Offline dorkshoei

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Re: Flat "DIP IC" pins for PCB-based IC?
« Reply #11 on: December 10, 2024, 05:51:28 pm »
Yes, you absolutely can, that question pops up regularly, I have them on my desk, and every. single. time. I forget what they're called.
The issue with the the BA leadframes is the huge MOQ.   There doesn't seem to be a distributor who will sell off the reel.   This discussion on Parallax Forum has been posted here before and is informative.   The poster went on to design the "flip pins".

A standard IC leg protrudes about 4mm below the base of the device but the BA3760 (which fit a standard pcb thickness) are about 13.7mm so they need accurate hand trimming.   A pcb using them will probably also sit slightly higher in a socket than a true IC because the 2mm standoff of the leadframe extends below the pcb.

I think these are what you're looking for:
https://www.te.com/en/plp/leadframes/Y30nn.html?n=42057&d=544927
They need to be cut after mounting.
I don't think these are an option.   The only ones that supports a standard pc board thickness (1.57mm) are a horizontal attachment.    The Dual In Line only supports 0.63mm and 1mm pcb thicknesses.

AFAIK the BA3760 (there are several threads here on them if you search) is about the best option assuming you can find some at a decent price.   
« Last Edit: December 10, 2024, 06:12:19 pm by dorkshoei »
 


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