## Summary of the Buzzer Specification Document

This document details the specifications for a small electromagnetic buzzer, model ST-0503. Here's a consolidated summary of the key information:

1. Basic Specifications:

️· Dimensions: 5.0mm x 5.0mm x 3.0mm
️· Weight: 0.3 grams
️· Rated Frequency: 4000 Hz
️· Operating Temperature: -30°C to +70°C
️· Storage Temperature: -40°C to +80°C
️· Material: LCP (Liquid Crystal Polymer) casing, Ferrum diaphragm and core, Copper coil, NdFeB magnet.
️· Terminal Type: SMD (Surface Mount Device) with Sn plating.

2. Environmental Compliance:

️· RoHS compliant (Restriction of Hazardous Substances)

3. Performance Testing:

️· High-Temperature Test: 48 hours at +80°C. Acceptance criteria: meets specifications with no degradation (except SPL within ±10dB after 4 hours cooldown).
️· Low-Temperature Test: 48 hours at -40°C. Acceptance criteria: meets specifications with no degradation (except SPL within ±10dB after 4 hours cooldown).
️· Thermal Shock: 10 cycles between +80°C and room temperature. Acceptance criteria: meets specifications.
️· Temperature/Humidity Cycle: 10 cycles, 24-hour duration, at +80°C and 90-98% relative humidity. Acceptance criteria: meets specifications.
️· Operating Life Test: 96 hours of continuous operation at +25°C ±10°C. Acceptance criteria: meets specifications (except SPL within ±10dB after 4 hours cooldown).
️· Solderability: Passes solderability test with Sn plated terminals.
️· Vibration Test: Withstands vibration cycling for 2 hours per axis (X, Y, Z) at 10-55Hz with a peak amplitude of 1.52mm (9.3G).
️· Drop Test: Withstands 3 drops from 75cm onto a 40mm thick wooden board in each of the 3 axes (X, Y, Z).

4. Packaging:

️· Reels of 2500 pieces.
️· Inner box: 330mm x 330mm x 30mm.
️· Outer box: 350mm x 350mm x 370mm containing 10 inner boxes (25,000 pieces total).

In essence, this document defines the quality standards and testing procedures to ensure the reliability and performance of the ST-0503 buzzer in various application environments.