Electronics > Projects, Designs, and Technical Stuff

Connector sparking and damage due to inrush at "mating" time?

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tggzzz:

--- Quote from: zenerbjt on August 31, 2020, 09:07:25 am ---The JST connector has nothing in the datasheet which allows us to absolutely proove that the connector will be damaged by connecting it every day....so we wont get permission to re-do the circuit, as it will mean a PCB re-spin and will cost money.

--- End quote ---

Absence of evidence is not evidence of absence.

I'll bet there is nothing in the data sheet that will "enable you to absolutely prove the connector will be damaged by" storage in H2SO4 or being hit with a shoe or...

zenerbjt:
Thanks but relays have switching operation data (eg "10,000  operations") , so i am surprised that connectors dont have it.

Jeroen3:
Did you request the manuals from JST webpage? They are behind a license agreement.

http://www.jst-mfg.com/product/detail_e.php?series=277

Either way, the point of discussion here is not the electrical life., but mechanical. I don't think they are non rated for live plugging in any case. They are just an easier way to deal with what otherwise would have been solderjoints of screw terminals.
I think that before you reach 100 mating cycles you'll have loose wires.

ConKbot:
JST connectors like that are for cheap consumer appliances ("white goods")  So so they are meant to be plugged in once and left. I wouldn't be surprised if the rated cycle life was 20 cycles. (Edit: Molex picoblade is 30 cycles for comparison to something in a similar market segment)

I certainly wouldn't consider them for a 10k cycle application. Even if the contacts were ok, the wires would fatigue and snap off the back of the connector first.

Either add a soft start so its not popping every time its plugged in, pick a new connector with a long wipe what will have self cleaning action and some meat on the contacts, or both.

langwadt:

--- Quote from: zenerbjt on August 31, 2020, 11:43:46 am ---Thanks but relays have switching operation data (eg "10,000  operations") , so i am surprised that connectors dont have it.

--- End quote ---

the connectors that are meant to be plugged and unplugged have it, e.g.  standard USB is rated for 1500 cycles and that is with a maximum capacity on 5V of 10uF

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