SBM428R

Overview

The SBM428R is a piezoelectric buzzer manufactured by Mallory Sonalert Products Inc. It operates at a resonant frequency of 2800 Hz and produces a sound pressure level of 85 dB at a distance of 10 cm when driven by a DC voltage of 3V. The device features a rectangular form factor with dimensions of 42mm x 28mm x 8mm. It utilizes a built-in oscillator circuit for direct DC drive capability, eliminating the need for external driving components. The unit is designed for through-hole mounting with two leads extending from the base.

Feature Summary

• Integrated oscillator circuit enables direct connection to DC power sources without external drivers.
• Piezoelectric transducer technology provides reliable acoustic output with low power consumption.
• Robust rectangular housing supports secure through-hole PCB mounting.

Applications

• General purpose audible alarms in consumer electronics
• Status indication in household appliances
• Security system alerts

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure compatibility with required voltage and frequency tolerances. Confirm lead time and availability directly with authorized distributors as supply chain conditions may vary. Ensure the selected variant matches the mechanical footprint and electrical specifications required for the target design.

Selection Notes

Select this component based on the requirement for a 2800 Hz tone and 85 dB output level at 3V operation. Consider the physical dimensions and through-hole mounting style when designing the PCB layout. Evaluate the operating temperature range and environmental sealing requirements against the application's specific conditions to ensure long-term reliability.

Part Context

This part belongs to the Sonalert family of piezoelectric buzzers known for their compact size and high efficiency. Mallory Sonalert Products Inc. specializes in audible signaling devices for industrial and commercial applications. The SBM series typically offers various frequencies and sound levels to suit different alerting needs within electronic systems.

Replacement Considerations

Consult official substitution guides or cross-reference lists provided by Mallory Sonalert Products Inc. for verified equivalent parts. Ensure any substitute maintains identical electrical characteristics, including frequency, voltage, and sound pressure level, as well as mechanical mounting constraints.