Author Topic: Looking for SMD pin header with pins thinner than 0,64 mm  (Read 1247 times)

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Offline AndersJTopic starter

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Looking for SMD pin header with pins thinner than 0,64 mm
« on: January 02, 2020, 04:45:05 am »
I need to make an adapter to replace a non obtanium ram/rtc (DS1386) in a dip socket.
I.e. I want to make my own dip component.

I’m considering a pcb the size of the chip with smd pins on the bottom,
and a smd dip socket on the top where the new chip (M48T18) can be inserted.

I need 16 smd single row pins thin enough to fit into a IC socket.

Standard pins are 0,64 mm square.
These are too thick to comfortably fit a the IC socket on the boards.

Where can I find thin smd pins?


« Last Edit: January 04, 2020, 10:15:31 am by AndersJ »
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Offline jhpadjustable

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Re: Looking for SMD pin header with pins thinner than 0,64 mm
« Reply #1 on: January 02, 2020, 05:00:49 am »
Round machine pin headers are excellent for this application, often ~0.45mm diameter. See, for a randomly chosen example, Samtec's BBL series: https://www.mouser.com/ProductDetail/Samtec/BBL-106-T-E
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Offline AndersJTopic starter

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Re: Looking for SMD pin header with pins thinner than 0,64 mm
« Reply #2 on: January 04, 2020, 05:07:04 am »
Excellent suggestions, but not surface mounted.
I did however find them at www.photo-advantage.com/store/.
http://www.proto-advantage.com/store/datasheets/MPH100IMP40M-G-V-SM.pdf
Digikey has some of their parts.
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Offline tooki

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Re: Looking for SMD pin header with pins thinner than 0,64 mm
« Reply #3 on: January 04, 2020, 09:34:37 am »
I need to make an adapter to replace a non obtanium ram/rtc (DS1386) in a dip socket.
I.e. I want to make my own dip component.

I’m considering a pcb the size of the chip with smd pins on the bottom,
and a smd dip socket on the top where the new chip (M48T18) can be inserted.

I need 16 smd single row pins thin enough to fit into a IC socket.

Standard pins are 0,64 mm square.
These are too thick to comfortably fit a the IC socket on the boards.

Whera can I find thin smd pins?
Why SMD? SMD headers have the legs going in both directions, requiring you to use a larger board than if you went through-hole. And for this application, where you’re likely inserting into a regular DIP socket (not a precision one), through-hole’s mechanical strength is desirable if you need to remove it.

There are special clip-on pins designed specifically for this type of application, but they’re quite hard to find and expensive. Take a look at the DIL catalog here: https://batten-allen.com/en/what-we-do/catalogue-parts-leadframes
 

Offline AndersJTopic starter

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Re: Looking for SMD pin header with pins thinner than 0,64 mm
« Reply #4 on: January 04, 2020, 10:14:21 am »
Quote
Why SMD?

I need SMD because I am making a 32 pin DIP to 28 pin DIP adapter.
32 pins on the bottom of the adapter pcb connect to a
32 pin DIP socket (on the old/legacy board).
On the top of the adapter is a 28 pin SMD DIP socket.

With through-hole pins,
the bottom pins will penetrate the pads of the top side 28 pin DIP socket.

With SMD,
the top DIP socket can be exactly above the smd pins on the bottom side of the adapter.

I could use single row through-hole pins and offset the new chip sideways
but surrounding components prohibit that.
« Last Edit: January 04, 2020, 10:16:50 am by AndersJ »
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