2403 263 00077

Overview

The Knowles 2403 263 00077 is a general-purpose magnetic speaker designed for audio applications. It features an 8-ohm impedance and a rated power handling capacity of 500 mW, with a maximum power rating of 1 W. The device delivers a sensitivity of 74 dBA when tested at 1 W/1 M. Its operational frequency range spans from 300 Hz to 15 kHz, with a self-resonant frequency of 540 Hz. The unit utilizes a plastic cone and an Nd-Fe-B magnet, housed in a circular top-port configuration.

Feature Summary

• Top-port acoustic design for direct sound projection
• Magnetic construction using Neodymium Iron Boron (Nd-Fe-B) material
• Plastic cone diaphragm for durability

Applications

• General purpose audio output devices
• Portable electronic equipment requiring compact speakers
• Industrial control panels with audio feedback needs

Procurement Notes

Verify component status as this specific part number is officially listed as obsolete or discontinued by the manufacturer. Confirm availability through secondary distributors or authorized surplus channels. Ensure that replacement sourcing accounts for potential lead time variations associated with end-of-life components. Validate physical dimensions and electrical parameters against current design requirements before procurement.

Selection Notes

Select this component only if the specific acoustic characteristics match the system requirements. The 8-ohm impedance must align with the amplifier output stage. Consider the limited frequency response below 300 Hz when evaluating bass performance. Verify that the 500 mW power rating suffices for the intended volume levels. Check for alternative active models if long-term supply stability is critical.

Part Context

This speaker belongs to the Knowles audio product line, specifically within their range of small-form-factor magnetic transducers. It is engineered for integration into space-constrained electronic assemblies where standard through-hole mounting is not feasible. The top-port orientation allows for flexible enclosure design compared to rear-venting alternatives.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the item is marked as obsolete, engineers should consult the manufacturer's current catalog for equivalent modern replacements or perform a full redesign with compatible active speaker modules.