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Semiconductor History | NJR Kawagoe — The 4558 Turns Two Amplifiers Into an Audio Standard
· 1976
Personal memoryBy kevin · · Report an issue
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Semiconductor History | NJR Kawagoe — The 4558 Turns Two Amplifiers Into an Audio Standard
kevin
1976
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Nisshinbo Micro Devices’ fullest corporate account says the RC4558 originated in Silicon Valley in 1971, was transferred to New Japan Radio, and entered Japanese production in 1976. Another official company essay calls 1977 the NJM4558 release year, so this memory uses the better-explained 1976 production milestone while preserving the one-year source conflict.
The device put two internally compensated, high-gain operational amplifiers on one silicon chip. Today’s NJM4558 specification still lists two channels, a typical gain-bandwidth product of 3 megahertz, a one-volt-per-microsecond slew rate, and operation from dual supplies of plus or minus 4 to 18 volts: modest numbers that made the part easy to design into audio, instruments, and general analog circuits.
The good was repeatability at enormous scale. New Japan Radio turned a useful American circuit into a Japanese long-life product, sold a cumulative 500 million units by 1985 according to its corporate history, and used the platform to build later audio amplifiers; a cheap eight-pin chip could replace many discrete transistors while keeping two signal channels reasonably matched.
The bad was that “general purpose” also meant easy comparison, price pressure, and audible limitations. Nisshinbo recounts that an audio manufacturer criticized the NJM4558’s sound, pushing the company to listen with customers and create the NJM4580; the successor’s success showed that longevity can conceal a technical ceiling, while commodity analog parts must fight substitutes and clones for decades.
The pin marks the verified Kawagoe Plant, now an integrated development and production base for electronic devices and microwave products, not the exact 1976 line. The cover is a later surface-mount JRC 4558D on a speaker board, not an original dual-inline NJM4558.
Sources: Nisshinbo Micro Devices, “From the Mount Fuji Weather Radar to MUSES,” “The Guardian of Original Sound: MUSES,” NJM4558 product specification, corporate profile, and Kawagoe Plant pages.
Photo: “Vooni Splash Speaker HR686 — New Japan Radio JRC 4558D,” Raimond Spekking, CC BY-SA 4.0. https://commons.wikimedia.org/wiki/File:Vooni_Splash_Speaker_HR686_-_board_-_New_Japan_Radio_JRC_4558D-2652.jpg
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