The Passive Buzzer 9042 is a compact piezoelectric sound component designed for electronic circuits, microcontroller projects, and embedded system applications. With a small 9×4.2mm form factor and 16Ω impedance, this passive buzzer produces sound when driven by an external AC signal, making it suitable for tone generation, alerts, and audio indicators in Arduino and DIY electronics projects.

Key Features

• Passive piezo buzzer requiring an external signal to generate sound
• Compact 9042 form factor (9×4.2mm) suitable for space-constrained circuits
• 16Ω impedance for stable signal-driven operation
• Supports low-voltage operation at 3V–3.3V
• Suitable for Arduino, microcontroller boards, and DIY electronics projects
• Ideal for alarms, notifications, tone generators, and embedded sound feedback

Technical Specifications

• Product Type: Passive Piezo Buzzer
• Model: 9042
• Impedance: 16Ω
• Operating Voltage: 3V–3.3V AC signal
• Dimensions: 9 × 4.2 mm
• Type: Passive (requires external frequency signal)
• Mounting: Through-hole pins
• Application: Arduino projects, DIY electronics, alarms, and sound indicators