H5 A5 BOM (or lack of)

[PaulJ]

@Icky , do you know if there is a socket to handle the 68901. Any idea why the 68901 layout from the H4 wasn’t used? Soldering the chip on without a socket looks really painfull. Any words of wisdom here. :)

[DoG]

@Icky , do you know if there is a socket to handle the 68901. Any idea why the 68901 layout from the H4 wasn’t used? Soldering the chip on without a socket looks really painfull. Any words of wisdom here. :)

Search for 52 pin PLCC SMD socket. Carefully cut away the inner plastic support in the middle. Solder from the inside with normal soldering iron. Put back the plastic bit you cut away earlier to get the distance right when you put the MFP in.

[PaulJ]

@Icky , do you know if there is a socket to handle the 68901. Any idea why the 68901 layout from the H4 wasn’t used? Soldering the chip on without a socket looks really painfull. Any words of wisdom here. :)

Search for 52 pin PLCC SMD socket. Carefully cut away the inner plastic support in the middle. Solder from the inside with normal soldering iron. Put back the plastic bit you cut away earlier to get the distance right when you put the MFP in.

Thanks DoG.. That’s what I was hoping. I’d watched a video from here where someone I don’t remember replaced a PLCC processor using that stile of socket. I wasn’t sure they made a socket of that type for chips with that small of a pin count. Pretty much have everything on order except my mouser parts so will find the socket there.

[PaulJ]

@exxos|@Icky , I found this socket from mouser but the pitch of 2.54mm seems too large. Is this the correct socket for the 68901? No board yet so can't measure the pad pitch. Thanks.. Paul

52.jpg

Well I found sockets with a pitch of 1.27mm but as you can see 52 pin is not supported. Did anyone find a socket that works for the 68901?

none.png

[Icky]

@exxos|@Icky , I found this socket from mouser but the pitch of 2.54mm seems too large. Is this the correct socket for the 68901? No board yet so can't measure the pad pitch. Thanks.. Paul

Well I found sockets with a pitch of 1.27mm but as you can see 52 pin is not supported. Did anyone find a socket that works for the 68901?

I haven't had time to look at SMT socket for this chip. TBH I think you may struggle as you won't be able to use the heatgun over the socket as it will melt it if you are not careful. I have seen people try to use a soldering iron through the gaps but also that ends up deforming the socket.

For me I am just going to solder the chip directly and be done.

[DoG]

...
Well I found sockets with a pitch of 1.27mm but as you can see 52 pin is not supported. Did anyone find a socket that works for the 68901?

https://www.digikey.co.uk/product-detai ... 1575838389

Its the same right? 1,27"

[Icky]

@DoG, @PaulJ - I just took the link @DoG provided above and uploaded the 3D model on the foot print. It fits but as I said I expect you will melt a few in the process of getting these on.

Screenshot 2020-10-22 at 18.28.33.png

[DoG]

Same on mouser... It says 1.27" pitch there. Easiest if you cut away all the plastic 'stems' and remove middle part of plastic before soldering.

[DoG]

Old but good 'how to':

[PaulJ]

Thanks for the part number @DoG , guess I'll order a few and if they are the pain in the a## I suspect I'll just attempt to solder the device on the board. If the 68901 had the same case stile as the SMT glue it wouldn't be an issue but the 68901 devices has the legs tuck under are just a PIA. :coffee: