New Release of the MUSES8921 Series, a High Quality Sound, J-FET Input Dual Audio Operational Amplifier—Audio Operational Amplifier Offering "Real Pure Sound" of Heartquake

Nisshinbo Micro Devices Inc. released the MUSES8921 series, a high quality sound, J-FET input dual audio operational amplifier for use in audio applications.

This product is the standard model of the MUSES series. It features J-FET input and represents the culmination of our operational amplifier design technology and experience, both refined over approximately 50 years, in pursuit of reproducing the original sound with the utmost fidelity.
We have employed analog technology dedicated to faithfully reproducing delicate sounds—from musical nuances and atmosphere to the very expression of silence. Rather than relying solely on numerical specifications, we have conducted rigorous listening evaluations, achieving an ideal performance that meets the expectations of those who genuinely love sound.

Key features include the following:

Input Noise Voltage (Noise Characteristics): 8.0 nV/√Hz typ (at f = 1 kHz)
Gain Bandwidth Product: 11.0 MHz typ
Total Harmonic Distortion: 0.0004% typ
High Slew Rate: 25 V/μs typ
Low Input Bias Current: 5 pA typ

Product Name	MUSES8921AN (EMP-8-AN)	MUSES8921GR (DFN4035-8-GR)
Sample Unit Price (Reference unit price when purchasing 1000 units, tax Included*)	JPY 500	JPY 550
Sample Order Start Date	October 9, 2025	Same as Left
Monthly Production	100,000 pcs	Same as Left

*The price is based on the consumption tax rate as of October 2025.

These characteristics make it ideal for a variety of high-quality audio applications, such as audio preamplifiers, reference amplifiers, active filters, line amplifiers, and I/V converters.

MUSES is our brand of audio semiconductor devices committed to pursuing high-quality sound. These products are unique in the world, based on the following concept:

Pursuing high-fidelity sound
Pursuing sound true to the original, free from coloration, exaggeration, or loss
Pursuing sound that resonates with the senses beyond numerical expression

This logo is a trademark of Nisshinbo Micro Devices Inc.

Features

1. J-FET Input Type of the MUSES Standard Model, Pursuing High-Quality Sound

This product is based on MUSES8920/A, which has received high praise for its sound quality. The product employs the high-quality sound technologies cultivated during the development of the MUSES flagship models. We have achieved improved sound quality by thoroughly reviewing and optimizing the signal and power path designs, as well as the placement of elements.

JFET-Input Type of the MUSES Standard Model, Pursuing High-Quality Sound

2. Optimal Audio Characteristics for I/V Converters

In addition to its low noise, low distortion, and high slew rate, its low input bias current characteristic, which is inherent to J-FET inputs, enables outstanding performance in I/V converter applications.

3. Compact, High-Heat-Dissipation Package (DFN)

The product uses a compact DFN package, enabling it to be mounted in limited spaces. This feature enhances the downsizing of application systems and increases design flexibility. Furthermore, its excellent heat dissipation performance enables stable operation even at high output power levels, supporting a reliable design.

Product Photo

MUSES8921 Product Photo

MUSES8921 (left: EMP-8-AN, right: DFN4035-8-GR)

Main Specifications (Please refer to the datasheet for details.)

Item	MUSES8921AN	MUSES8921GR
Package	EMP-8-AN 3.9 × 5.0 × 1.65 mm	DFN4035-8-GR 4.0 × 3.5 × 0.75 mm
Number of Circuits	2	Same as Left
Operating Voltage Range	±3.5 V to ±17 V	Same as Left
Input Noise Voltage	8.0 nV/√Hz typ. at f = 1 kHz	Same as Left
Total Harmonic Distortion	0.0004% typ. at f = 1 kHz	Same as Left
Gain Bandwidth Product	11 MHz typ.	Same as Left
Slew Rate	25 V/μs typ.	Same as Left
Input Bias Current	5 pA typ.	Same as Left
Unity-Gain Stable	Yes	Same as Left
J-FET Input	Yes	Same as Left
Bipolar Technology	Yes	Same as Left