They seem pretty the same, but B1R version is almost twice cheaper (at least in my country, and I don't know what are the manufacturers).

  • \$\begingroup\$ The letter suffix on an IC part number generally specifies the package - and these package codes vary between manufacturers. It looksllike B1R is SGS-Thompson's code for a normal DIP package. N is Texas Instrument's code for the sasme package. \$\endgroup\$ – Peter Bennett Oct 24 '15 at 20:35

It's a matter of manufacturer and specifications. The B1R suffix identifies a part made by STMicroelectronics, while an N suffix suggests a number of different possible manufacturers. The STM part is significantly slower than other makers' versions (55 MHz typ @ 5V for STM, 91 MHz typ @ 4.5V for SGThompson, for instance). At a guess, the STM part has a significantly smaller die than others, which limits the output drive into real loads, and produces a slower unit. But the smaller die allows lower cost.

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  • \$\begingroup\$ Not sure anyone would really use 74hc at > 50MHz would they? \$\endgroup\$ – user1844 Oct 24 '15 at 20:25

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