any one know (replacement for Bourns component possibly TVS diode)

hugo00

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I repairing Irrigation controller which using the part from Bourns US company (www.bourns.com), but the problem is : on there site and on the web is NO information at all for the parts which they produse, any one can let me know where I can get the part or some equivalent? be appreciated for any help
I believe the part is TVS diode but the value do not know as picture is TWO different controllers one using (B)635 bfp and another (B)738 bfp [(B) is the logo of Bourns]
Thank you
 

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betwixt said:
Check https://www.st.com/en/protections-and-emi-filters/sm15t68ca.html.
Table 6 shows marking codes and the numbers are probably a date code, I would guess last digit of manufacturing year and the week number.

Brian.
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Hello Brian,
Thank you for reply, I don't think the numbers are year and week the manufacture of the controller is August 2018 and January 2018 Hunter Industries not small company will NOT used the parts old 30-40 years (738, 635) the part will be bidirectional type TVS that what I guessing it is a part of power supply
 

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I was thinking date codes of 2017 week 38 and 2016 week 35.
The device package and the letter code BFP do match the device I mentioned and it's function could be as a voltage clipper.
LTV826 is an optocoupler so a TVS probably wouldn't be the best device to protect it.

Brian.
 

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According to Bourns document, they are using 3-digit and 4-digit numerical date code for diodes, 3-digit as described by betwixt.
Bourns is using marking code 5BFP for 5.0SMDJ36CA, obviously not the same as BFP. It might be also a second source for ST SM15T68CA.
 

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