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What does the letter at the end of OPAMP model mean such as OPA627AU, OPA627BU, OPA627BM, OPA627SM?

April 26, 2017letter mean model opamp

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What does the letter at the end of OPAMP model mean such as OPA627AU, OPA627BU, OPA627BM, OPA627SM?

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The first letter, ‘A’,’B’,’S’ means ‘OPAMP Grade’ and the quality is better in following order. ‘A’ < ‘B’ < ‘S’ The second letter, ‘U’,’M’,’P’ means ‘package type’. P: DIP type U: SMD(SOIC-8) type M: Metal Can type(It protects against the noise and electricity) Therefore the SM type is the highest price as the best sound quality.