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Fake SIPEX SP3232E (RS232 Tx/Rx) [message #6395]

Mon, 17 June 2019 10:46

just4fun
Messages: 273
Registered: May 2017
Location: Dark side of the Moon

Senior Member

I was testing a 2-channels RS232 adapter for my FPGA board, when I saw this "miracle":

/forum/index.php?t=getfile&id=1430&private=0

If any signal from the RS232 is at a positive voltage and the board is not powered, there is a leakage current to VCC that turns on the led (power indicator).

More, if a VCC = 3.3V is applied the board doesn't work for speed greater than about 300 bps.
Applying a VCC = 5V the board works as expected.

I've used a couple of SP3232E (marked SIPEX that should work @ 3.3V and 5V according to the spec, ah ah...) that I bought from Aliexpress more that one year ago and not used until now:

/forum/index.php?t=getfile&id=1431&private=0

/forum/index.php?t=getfile&id=1431&private=0

I really think that is another fake RS232 IC...

I've just removed both the ICs and cleaned the pads...

/forum/index.php?t=getfile&id=1429&private=0

...so probably tomorrow I'll try with a new lot of SP3232 from EXAR bought from TME (www.tme.eu).

We'll see...

[Updated on: Tue, 18 June 2019 05:29]

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		Fake SIPEX SP3232E (RS232 Tx/Rx) By: just4fun on Mon, 17 June 2019 10:46
		Re: Fake SIPEX SP3232E (RS232 Tx/Rx) By: just4fun on Tue, 18 June 2019 10:39

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