NJM2521M

Audio Special Purpose Overview

The NJM2521M is a 3-input to 1-output audio switch manufactured by Nisshinbo Micro Devices Inc. (formerly New Japan Radio). It utilizes bipolar technology and features two bias-type inputs alongside one buffer-type output. The device operates within a supply voltage range of +4.75V to +13V. Key electrical characteristics include a typical input impedance of 58 kΩ and a crosstalk rejection of -70 dB. Designed for surface-mount applications, it is housed in an 8-DMP package.

Audio Special Purpose Feature Summary

• 3-Input, 1-Output configuration with two bias-type inputs and one buffer-type output
• Operating voltage range from +4.75V to +13V
• Typical crosstalk rejection of -70 dB
• Input Impedance: 58 kΩ typ.

Audio Special Purpose Applications

• Audio signal routing in consumer electronics
• Multi-source audio selection systems

Audio Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm the package type, as the NJM2521 series includes DIP, DMP, and SSOP variants. Confirm component availability status, as older audio ICs may have limited stock or end-of-life implications. Ensure the selected variant matches the required PCB footprint and thermal dissipation requirements for the target application.

Audio Special Purpose Selection Notes

Select the NJM2521M when a surface-mount 8-pin SOIC package is required for a 3-to-1 audio switching application. This model is suitable for designs requiring high crosstalk rejection within a single-supply voltage environment. Compare input impedance and switching voltage thresholds against other audio switches if interface compatibility with preceding stages is critical.

Audio Special Purpose Part Context

The NJM2521M belongs to the NJM2521 family of audio switches produced by Nisshinbo Micro Devices Inc. The 'M' suffix specifically denotes the 8-DMP (Surface Mount) package option, distinguishing it from the DIP8 (NJM2521D) and SSOP8 (NJM2521V) variants. All variants share identical electrical specifications and pin functions.

Audio Special Purpose Replacement Considerations

Direct replacements must match the 3-input/1-output topology and 8-pin surface-mount package. Verify that substitute components offer comparable crosstalk rejection (-70 dB typ.) and operate within the same voltage range (+4.75V to +13V). Check pinout compatibility to ensure SW1, SW2, and Vout connections align without circuit modification.