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LM2903-N: What's the difference between LM2903-N and LM2903?
As Kai said, the "-N" devices denote "duplicate" devices inherited from the National Semiconductor merger.
TI continues to produce the "original recipe" National Semiconductor devices for those customers that cannot switch to the TI devices for various reasons (usually qualifications).
The TI devices are "cheaper" mainly due to greater popularity (volumes) and competitive pressures.
In 95% of the applications, they will perform identically, but spec #1 is usually price.
