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Hi,
Darlington Transistor Array - ULN2803AN
Would like to know the alternate part# where 100% drop in replacement possible. Treat this on highest priority and do the needful
The ULN2803AN was discontinued in 2015. There is no replacement because the manufacturer no longer makes 18-pin packages.
The nearest replacement would be the ULN2803C, in a 20-pin SOIC package.