On 1/17/21 12:34 PM, Istvan Hegedus wrote: > Hi Jim, > Ok I send you a PM. Note however that I need the 48 pin one. 40 pin one is > good for 8501 replacement. You should also be able to use 2 x 24pin type. I have done that with sockets when replacing the TED socket on 264 systems. Gerrit > Thanks > Istvan > > On Sat, Jan 16, 2021 at 7:24 PM Jim Brain <brain_at_jbrain.com> wrote: > >> On 1/16/2021 4:15 AM, Istvan Hegedus wrote: >> >> >>> >>> I can't argue the smaller footprint FPGA and 4 layer PCB, but I'd keep >>> the surface mount header. I think they look much more neat in circuit >>> and if you trim the outside of your PCB to just beyond the SMT pins, I >>> don't think the design will be too wide. Having the pins sticking >>> through reduces top PCB area a lot and then you have to worry about >>> cutting the pins off and making sure they do not touch metal shields and >>> such if folks re-assemble the EMI stuff. >>> >>> Jim >>> >>> You are right, if I use through hole header then I don't have much space >> left on the two sides for routing and components. >> I will consider it. There are only 2 drawbacks, price of the smd IC header >> and the lead time (I have ordered it at Mouser in november and they promise >> it now at the end of feb). >> >> Regards >> Istvan >> >> I plan to buy 1000 of the SMT ones (I have the 28 pins in SMT and through >> hole and the 24 in through hole and plan to buy in SMT as well) and am >> happy to set aside 100 or so for you if desired. You can directly email >> me for pricing, but I can't believe 40 pins of smt header would be no more >> than 1.25 USD, and probably $1.00 (from my supplier, SMT and though hole >> differ in price by only a few pennies), which looks far cheaper than Mouser >> options (not sure why Digikey and mouser are so expensive on IC headers). >> Lead time is about 2-3 weeks. I can mail you a few 28 pin ones to check on >> quality if desired. >> >> You can see what the through hole ones look like here: >> >> http://store.go4retro.com/ic-header/ >> >> And the SMT ones look the same on the bottom, but the upper post is bent >> out 90 degrees like in your footprint. >> >> Don't worry if you're not interested. I plan to buy the 40 pin SMT ones >> either way and use for other projects. Just let me know your thoughts. >> >> If others are looking for non trivial connectors, let me know. I regularly >> source in bulk and if I can put it in the store or think up a use in a >> product, happy to buy 1000 of them (1000 is typically the minimum order >> quantity for manufacturers). >> >> >> Jim >> >> >> >> -- >> Jim Brainbrain_at_jbrain.com www.jbrain.com >> >> >Received on 2021-01-17 13:02:06
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