df1700

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The DF1700 is the same as the NPC SM5813. This has also been discontinued but you can find the datasheet here
http://www.npcamerica.com/Datasheets/OLD_Products/sm5813.pdf
While it is possible to replace the DF1700 with the DF1704/6, it would require a fair amount of work as the two chips are not pin compatible and the DF1704/6 is a surface-mount device.
NPC do list the SM5841D as a replacement for the SM5813 but again the two chips are not pin compatible.
 
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