help identify sot23-6 burned smd component from a Hornby locomotive decoder

[kripton2035]

Hi everyone,
I'm looking for the ref of the burned component (see picture)
the marking on it seems "H4" or "H47" ?
there are 4 identical circuits on this board marked the same. on a working board, the burned chip is the same as the 4 others "H4"
it comes from a Hornby "4 channels locomotive decoder"
I presume it's some mosfet, but which one ?
I you have any idea it would be much appreciated.


thanks.

[Gyro]

My usual search pages pull up a Rohm EMH4 dual digital transistor or equivalent as a possibility.  Edit: That might make sense as it looks like the sort of application where they need to keep the parts count down.

[kripton2035]

thanks it seems to be that part.
helas, you must buy them in 3000 qty ... even with shipping in smaller quantities it's still the same price as a new hornby device ...

[Gyro]

You could maybe bodge it with a couple of air-wired SOT23 transistors and a few resistors (actually, just 2 10k base resistors) - assuming you can work out why it blew!.

Edit: The package contains two separate dies and it looks as if only one of them smoked.

[fzabkar]

http://www.smdmark.com/en-US/search/code?id=h4

There are three package styles:

http://rohmfs.rohm.com/en/products/databook/datasheet/discrete/transistor/digital/emh4t2r-e.pdf

This one is available in single quantities:

https://www.digikey.com/en/products/detail/rohm-semiconductor/UMH4NFHATN/10709440

[kripton2035]

found it on lcsc in 10 qty ! and more than reasonable price.
https://lcsc.com/product-detail/Transistors-NPN-PNP_Nexperia-PUMH4-115_C455002.html


ps: digikey asks for $22 to ship 1 ic to europe ...