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LM2901: About the difference between LM2901PWR and LM2901PWRG3/4

Part Number: LM2901

Hi,

The following types of LM2901 are available.

・LM2901PWR:Web price $0.07
・LM2901PWRG3:Web price $0.067
・LM2901PWRG4:Web price $0.067

Could you tell me the difference between the types.

1.LM2901PWR is a mixed product of LM2901PWRG3 and LM2901PWRG4.
 Is this understanding correct?

2.Please tell me the reason why LM2901PWR is higher in Web price than LM2901PWRG3/4.
   Customers think mixed products should be cheaper.

Regards,
Yusuke