smd - Page 1
Forum section: electronics / beginners

author: ethhanners
author_rank: Contributor
timestamp: February 15, 2014, 07:48:42 pm
content: just wondering

author: rdl
author_rank: Super Contributor
timestamp: February 15, 2014, 08:33:08 pm
content: You left off "mostly".

author: Monkeh
author_rank: Super Contributor
timestamp: February 15, 2014, 08:50:19 pm
content: I think it already has for nearly every component and device it's suitable for.. And it did so more than a decade ago.

author: cyr
author_rank: Frequent Contributor
timestamp: February 15, 2014, 08:51:40 pm
content: If you mean that literally, then no. There are special cases where through hole makes sense, like where the added mechanical strength is needed.I still think it's fair to say SMD has taken over, a long time ago. Have you seen a modern PCB?

author: rdl
author_rank: Super Contributor
timestamp: February 15, 2014, 09:16:02 pm
content: QuoteYes, such as connectors. That's why I suggested mostly, though I guess you could interpret "mostly" as being the same thing as "no", since the poll did specify "completely".

author: mariush
author_rank: Super Contributor
timestamp: February 15, 2014, 09:27:18 pm
content: For some things, it makes sense to be through hole ... connectors, common mode chokes, large capacitors, transformers.There's gonna be through hole parts for long time, at least as long as single sides or double sided boards will continue to be made and human hands are cheap - just grab 20-40 girls and a production line and pay them 1-3$ and each of them will place 2-3 components on the pcb and pass it to next girl.Beats the investment into a chip shooter.

author: eneuro
author_rank: Super Contributor
timestamp: February 15, 2014, 10:05:12 pm
content: I think, those small SMD elements soldered from two sides looks for me very sensitive for stress when PCB is pressed or temperature changes its shape. Lets say, pressed one side will go down 5mm while PCB is 100mm long so board looks like arc with big radius however, old school resistor in this case will simply change its legs and should be ok if it is not quick oscilation, but SMD element have very little chance to change its dimensions to adjust, so due to mechanical issues in some projects I will prefere old school or something beetween mix, if automatic manufacturing and costs or size optimisation is not main goal in my not professional, but prototype design

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 15, 2014, 10:22:35 pm
content: Already did.

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: February 15, 2014, 11:06:32 pm
content: The problem is, your question is (with spelling corrected):"do you think smd will take over through holecompletelyin the next 5 years"To which the answer will always be no, as there are situations and applications where a SMD part simply cannot be used.

author: tszaboo
author_rank: Super Contributor
timestamp: February 16, 2014, 12:26:17 am
content: So instead of 99% it will be 99.99%? By all means.But, where it stays, you usually need through hole.

author: Rigby
author_rank: Super Contributor
timestamp: February 16, 2014, 03:20:52 am
content: You have demonstrated why polls like this often fail to produce useful results.In the question you state "completely" then in the choices you fuzz that up in various ways. All of them would fall under "no." A word like "completely" implies an absolute; completely or not, yes or no. You would leave out the word "completely" if you wanted answers between yes & no.

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: February 16, 2014, 03:30:36 am
content: Quote from: Rigby on February 16, 2014, 03:20:52 amI'm more concerned about people who have opted for anything other than "yes" or "no" as no other option is even a valid response to the question

author: peter.mitchell
author_rank: Super Contributor
timestamp: February 16, 2014, 03:35:48 am
content: Would SOT-227 be classified as SMD or TH?

author: Rerouter
author_rank: Super Contributor
timestamp: February 16, 2014, 03:47:04 am
content: Quote from: peter.mitchell on February 16, 2014, 03:35:48 amPanel Mount

author: hagster
author_rank: Frequent Contributor
timestamp: February 16, 2014, 07:33:35 am
content: Maybe a better question would be; do you think digikey will stop selling through hole resistors and capacitors within 5years? Ignoring speciality parts like very large caps and high power resistors.Once this happens I would call through hole dead. As many here say there will always be some components that it makes sense for.

author: Rerouter
author_rank: Super Contributor
timestamp: February 16, 2014, 08:22:56 am
content: unless people stop needing 1W, 3W, 5W, 10W etc resistors and decent capacitances at moderate to high voltages throughole is here to stay and has its purpose

author: peter.mitchell
author_rank: Super Contributor
timestamp: February 16, 2014, 01:26:06 pm
content: Quote from: Rerouter on February 16, 2014, 08:22:56 amThe larger surface mount chip resistors can handle 1-5W, and they sell DPAK resistors for 5-50W, they aren't too pricey comparatively.

author: SeanB
author_rank: Super Contributor
timestamp: February 16, 2014, 02:19:03 pm
content: Be pretty hard to put SMD in a power application like in line with aheater to reduce power, or to add a class X capacitor across a mains input . SMD implies a PCB of sorts. There are applications that do not really require a PCB to have components mounted on them.

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: February 16, 2014, 08:35:43 pm
content: Rather difficult to build something like this with nothing but SMD