SC628A

Overview

The SC628A is a piezoelectric audio indicator from the Mallory Sonalert SC series. It operates on 6 to 28 VAC or DC with a rated current of 16 mA. The device produces a continuous tone at 4.5 kHz with a sound pressure level of 68 dBA at 6V measured at 61 cm. It features panel mount installation via screw terminals and quick-connect tabs (0.250 inch). The unit has a diameter of approximately 43 mm and a height of 35.54 mm, operating within a temperature range of -30°C to 65°C.

Feature Summary

• Piezoelectric technology for reliable acoustic signaling
• Internal driver circuitry for direct AC/DC operation
• Dual termination options including screw terminals and quick-connect tabs

Applications

• Industrial equipment status indication
• Control panel alarm systems
• Medical device auditory alerts

Procurement Notes

Verify specific suffix requirements such as 'AH' or 'AHR' for exact frequency and certification variations. Confirm terminal style compatibility with existing panel interfaces. Check RoHS compliance status against project specifications. Ensure voltage ratings match the target system power supply. Validate mounting hole dimensions for mechanical integration.

Selection Notes

Select based on required sound pressure level and frequency characteristics. Consider the internal driver capability for simplified circuit design. Evaluate physical dimensions against available panel space. Assess environmental temperature ranges for operational reliability. Compare termination styles for ease of assembly and maintenance.

Part Context

The SC628A belongs to the long-standing SC series introduced in the early 1960s. This line established the foundation for modern industrial audio indicators. The series is known for robust construction and consistent performance across decades. It remains a standard component in various electronic assemblies requiring audible feedback.

Replacement Considerations

SC628AHR is listed as an available substitute part number.