BK-28507-000

Overview

The Knowles BK-28507-000 is a subminiature balanced armature receiver speaker designed for compact audio applications. It features a side-port rectangular housing with dimensions of 7.87 x 5.59 x 4.04 mm. The component operates within a frequency range of 100 Hz to 6 kHz and has a nominal impedance of 13.3 Ohms. It delivers a sound pressure level of 126 dBA, ensuring high efficiency and output in small form factors. The device utilizes magnetic technology for stability and reliability.

Feature Summary

• Balanced armature design for high efficiency and acoustic performance
• Subminiature rectangular package suitable for space-constrained devices
• Side-port configuration for directed sound output
• Robust construction ensuring operational stability

Applications

• Mobile communication handsets
• Wireless earpieces and headsets
• Portable medical diagnostic equipment
• Smart wearable devices requiring compact audio output

Procurement Notes

Verify the specific datasheet version when ordering, as manufacturing updates may occur. Confirm that the side-port orientation matches the mechanical design constraints of the target application. Ensure solder pad termination compatibility with the intended PCB assembly process. Check RoHS compliance status if required by regional regulations or end-product specifications.

Selection Notes

Select this component when a high-output, low-profile speaker is required for portable electronics. The 13.3 Ohm impedance and 126 dBA sensitivity make it suitable for battery-powered devices where power efficiency is critical. Consider the 100 Hz to 6 kHz frequency response to ensure it meets the voice or alert tone requirements of the system without needing additional equalization.

Part Context

This part belongs to Knowles' subminiature speakers line, which focuses on delivering high acoustic performance in minimal volumes. The BK series typically employs balanced armature technology, distinguishing it from dynamic drivers by offering higher efficiency and better consistency across production batches. These components are widely used in consumer electronics where size and weight are primary design constraints.

Replacement Considerations

Direct substitutes must match the 13.3 Ohm impedance, 100 Hz–6 kHz frequency range, and 7.87 x 5.59 x 4.04 mm dimensions. Verify that alternative parts maintain the side-port configuration and balanced armature architecture to preserve acoustic characteristics and mounting compatibility.