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NE5532: Difference between A-version and Non A-version

Part Number: NE5532

Hi experts,

What is the difference between NE5532 and NE5532A? Based on the E2E thread below, the audio spec of A-version is guranteed. What audio specs are A-version guranteed?

E2E forum: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/588620/ne5532a-what-are-the-differences-between-the-ne5532-and-ne5532a?tisearch=e2e-sitesearch&keymatch=NE5532%25252520AND%25252520NE5532A#

Best regards,

Shunsuke Yamamoto