SM1131 series datasheets. Manufacturer: NPC.

SM1131N High sound quality multi melody IC in 28-pin SDIP package. Operational temperature range from -20°C to 80°C. Datasheet*) SM1131S High sound quality multi melody IC in 28-pin SOP package. Operational temperature range from -20°C to 80°C. Datasheet*) SM1131 High Sound Quality Multi Melody IC Datasheet*)

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