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HI, buddy,
两颗料的封装相同,性能不同,不带A的性能更好,是datasheet里面的high-grade代表的产品(温漂,精度相对A版本都更好),如果你stand-grade 就可以接受,就用A版本好了,价格也会便宜,还需要你具体看看datasheet,谢谢。
Best Regards