Electronics > Projects, Designs, and Technical Stuff
Evolution of usb connector?
wraper:
--- Quote from: james_s on December 18, 2018, 05:04:17 am ---Move forward a few years further and we have even smaller, thinner devices. Soon it becomes apparent that an even thinner USB connector would be nice to have for these devices, so now we have micro USB. This further sacrifices mechanical strength in exchange for even smaller size but again this is ok because the devices have gotten even smaller and lighter.
--- End quote ---
Nope, it does not sacrifice anything compared to previous versions. It's more robust than any USB connector version previously made. More mating cycles and mechanically stronger. Micro USB connectors just don't break. Only variants with no through-hole mounting pins are subject for breaking off from PCB (it's the same for previous versions with no through hole and even worse). But even then, it's PCB which gets damaged, not connector. This is connector designed for minimum 10k mating cycles. Smaller does not mean less robust.
https://gct.co/usb-connector
--- Quote ---Number of mating cycles:
USB2.0 Full Size: 1,500 mating cycles, gold flash plating.
USB2.0 Mini: 5,000 mating cycles, 15µ” gold plating.
USB2.0 Micro: 10,000 mating cycles, 30µ” gold plating.
USB3.0 Full Size: 5,000 mating cycles, 30µ” gold plating.
USB 3.0 Micro: 10,000 mating cycles, 30µ” gold plating.
Type C: 10,000 mating cycles, 30µ" gold plating.
--- End quote ---
coppercone2:
what did they learn to make it better?
Is the plastics stronger? are the metals a different alloy? Did they figure out how to make better dies?
Mr. Scram:
--- Quote from: coppercone2 on December 18, 2018, 12:04:40 pm ---what did they learn to make it better?
Is the plastics stronger? are the metals a different alloy? Did they figure out how to make better dies?
--- End quote ---
What have you done to find the answer yourself, other than asking people about it?
coppercone2:
--- Quote from: Mr. Scram on December 18, 2018, 12:32:22 pm ---
--- Quote from: coppercone2 on December 18, 2018, 12:04:40 pm ---what did they learn to make it better?
Is the plastics stronger? are the metals a different alloy? Did they figure out how to make better dies?
--- End quote ---
What have you done to find the answer yourself, other than asking people about it?
--- End quote ---
you should post this in other peoples threads repeatedly
james_s:
--- Quote from: wraper on December 18, 2018, 11:48:57 am ---Nope, it does not sacrifice anything compared to previous versions. It's more robust than any USB connector version previously made. More mating cycles and mechanically stronger. Micro USB connectors just don't break. Only variants with no through-hole mounting pins are subject for breaking off from PCB (it's the same for previous versions with no through hole and even worse). But even then, it's PCB which gets damaged, not connector. This is connector designed for minimum 10k mating cycles. Smaller does not mean less robust.
--- End quote ---
Bullshit. I've repaired numerous devices that had mini and especially micro USB connectors ripped right off the PCB, and some with the surface mount variety were beyond repair as it tore the traces right off the board. I've had a few cables where the metal end of the connector got snapped off, I've never seen this happen with a fullsized USB connector. If you look only at mating cycles on a datasheet sure, but in the real world cables get tripped on, connectors get smashed up against walls, devices get dropped and knocked off desks. It's just simple physics, a tiny thin connector is going to break a lot more easily than a big thick one if you apply a lateral force. There's a reason things like printers and 3.5" external hard drives still use standard USB connectors, they're much stronger.
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