Alarms, Buzzers, and Sirens

Part Number	Description / PDF	Quantity
CMI-9705-85-SMT-TR CUI Devices	BUZZER, 9.7 MM X 9.7 MM X 5 MM D	0
CPT-2207-84T CUI Devices	BUZZER, 22 MM, 7 MM DEEP, P, 10	468
CEP-2224 CUI Devices	AUDIO PIEZO INDICATOR 3-20V TH	6022
CPT-357-105T CUI Devices	TRANSDUCER PIEZO 14V 30MM PCB MT	1004
CPE-165 CUI Devices	AUDIO PIEZO TRANSDUCER 30V	6009
CMI-1295IC-0385T CUI Devices	BUZZER, 12 MM X 9.5 MM DEEP, M,	0
CPI-2397-85T CUI Devices	BUZZER, 23.4 MM X 9.7 MM DEEP, P	28
CEP-1130 CUI Devices	AUDIO PIEZO TRANSDUCER 30V TH	1440
CPI-4242-85T CUI Devices	BUZZER, 42.5 MM, 42 MM DEEP, P,	333
CPS-3016-110L100 CUI Devices	BUZZER, 30.6 MM ROUND, 16MM DEEP	159
CMI-9605-0580T CUI Devices	BUZZER, 9.6 MM X 5 MM DEEP, M, 5	308
CMI-9655S-SMT-TR CUI Devices	AUDIO MAGNETIC IND 4-7V SMD	2027
CMI-1295IC-0585T CUI Devices	BUZZER, 12 MM X 9.5 MM DEEP, M,	396
CPT-1667-85T CUI Devices	BUZZER, 16.5 MM, 6.7 MM DEEP, P,	852
CPI-2398-90T CUI Devices	BUZZER, 23 MM X 9.8 MM DEEP, P,	51
CMT-0503-75-SMT-TR CUI Devices	BUZZER, 5 MM, 3 MM DEEP, M, 3 V,	0
CPT-2521C-500 CUI Devices	AUDIO PIEZO TRANSDUCER 50V CHAS	905
CPS-4242-100T CUI Devices	SIREN, 42.5 MM, 42 MM DEEP, P, 6	393
CPI-3213-90PM CUI Devices	BUZZER PIEZO 12V 32MM PNL MT	156
CMI-9705-0580-SMT-TR CUI Devices	BUZZER, 9.7 MM X 9.7 MM X 5 MM D	0

Alarms, Buzzers, and Sirens

1. Overview

Alarms, buzzers, and sirens are audio signaling devices designed to alert humans to specific conditions through audible signals. They play a critical role in safety, security, automation, and communication systems. These devices convert electrical energy into sound waves using mechanical or electronic mechanisms, ensuring detectability in various environments.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
Electromagnetic Buzzers	Use magnetic fields to vibrate a diaphragm; low power consumption	Consumer electronics, industrial equipment
Piezoelectric Buzzers	Utilize piezoelectric crystals for sound generation; high reliability	Medical devices, smoke detectors
Electronic Sirens	Generate variable tones via integrated circuits; weatherproof designs	Emergency vehicles, outdoor warning systems
Strobe Alarms	Combine loud sounds with high-intensity light flashes	Hazardous environments, fire alarm systems

3. Structure and Components

Typical components include:

Sound-producing element (diaphragm, piezo disk, or speaker)
Driving circuitry (oscillator, amplifier)
Housing (plastic/metal enclosure for durability)
Mounting hardware (screws, brackets, or PCB pads)
Optional LED modules for visual alerts

4. Key Technical Specifications

Parameter	Importance	Typical Range
Sound Pressure Level (SPL)	Determines audibility distance	60-120 dB
Operating Voltage	Affects compatibility with host systems	3-24 V DC
Frequency Range	Influences tone characteristics	1-5 kHz
Current Consumption	Impacts power budget	5-150 mA
Environmental Rating	Determines deployment suitability	IP40-IP67

5. Application Fields

Major industries include:

Industrial automation (emergency stop systems)
Security systems (intrusion detection)
Transportation (vehicle reversing alarms)
Healthcare (patient monitoring alerts)
Consumer electronics (smart home devices)

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Honeywell	56 Series Buzzers	RoHS compliant, 85 dB@10cm
Siemens	SIRIUS 3RA2	Multi-tone siren with IP66 rating
Omron	Industial Buzzers	Compact 24V DC design
Eaton	Audio Strobe Alarms	110 dB with LED flash

7. Selection Recommendations

Key considerations:

Environmental conditions (temperature, humidity, vibration)
Required SPL for target detection distance
Electrical compatibility with control systems
Certifications (CE, UL, ATEX for hazardous areas)
Mounting constraints (panel mount vs. PCB integration)

Case Study: Factory automation systems often select IP67-rated 24V buzzers with >90 dB SPL for machine status alerts in noisy environments.

8. Industry Trends

Emerging developments:

Integration with IoT systems for smart alerts
Miniaturization while maintaining high SPL
Multi-tone capabilities via digital signal processing
Energy-efficient designs with wider voltage tolerance
Increased adoption of wireless-enabled alarm systems