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NJM4556A (marked 4556A X17L JRC) by Japan Radio Company. Dual operational amplifier. Data sheet.
The NJM4556A integrated circuit is a high-gain, high output current dual operational amplifier capable of driving ±70mA into 150Ω loads (±10.5V output voltage), and operating at low supply voltage (V+ /V- =±2V~). (From the data sheet)
The NJM4556A combines many of the features of the popular NJM4558 as well as having the capability of driving 150Ω loads. In addition, the wide band-width, low noise, high slew rate and low distortion of the NJM4556A make it ideal for many audio, telecommunications and instrumentation applications. (From the data sheet)