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SN54AC244: SN54AC244 : what is different between SN54 and SNJ54?

Part Number: SN54AC244

Dear TI experts, 

According to SN54AC244 datasheet, there is only SNJ54 and SN74 ordering number. 

There is no SN54 series. But the title is SN54AC244. 

I want to find SN54 series information.

Are they same parts SN54 and SNJ54? 

If they are same parts, why did you add J ?