Who is the actual manufacturer of this part

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It's an original National Semiconductor part. NS was acquired by TI in 2011. Microchip is apparently supplying the part as second source.
 

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  • LMC7101 SOT23 15V Rail-to-Rail-OP.pdf
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When a design has expired it's patent it may be second sourced by any Mfg without royalty payments, They may copy the design or pay a fee for the source code of the layout.

Such is the case for this generic CMOS Op Amp.

There are now many sources.

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