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NJM5532DD ultra-low-noise, low-distortion dual op amp
This is the Japanese (Nisshinbo/JRC) equivalent to the original Signetics NE5532 dual low-noise op amp.
It has all the same performance parameters as the original NE5532 including operation with up to ±22V supplies (maximum ±20V recommended), 4.5nV/√Hz noise and so on.
The DD-suffix version is the guaranteed low-noise variant that has a specified maximum 1.4μV RMS equivalent input noise with a 2.2kΩ source impedance.
Data sheet: https://www.siliconchip.com.au/Datasheets/NJR%20NJM5532DD.pdf
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NJM5532D low-noise, low-distortion dual op amp
This is the Japanese (JRC) equivalent to the original Signetics NE5532 dual low-noise op amp.
It has all the same performance parameters as the original NE5532 including operation with up to ±22V supplies (maximum ±20V recommended), 4.5nV/√Hz noise and so on.
Data sheet: https://www.siliconchip.com.au/Datasheets/NJR%20NJM5532D.pdf
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NE5534P ultra-low-noise, low-distortion single op amp
This is a genuine Texas Instruments equivalent to the original Signetics NE5534 ultra-low-noise op amp.
It has all the same performance parameters as the original NE5534, including operation with up to ±22V supplies (maximum ±20V recommended), 3.5nV/√Hz noise and so on.
Data sheet: https://www.siliconchip.com.au/Datasheets/TI%20NE5534P.pdf
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