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30mm Piezo Buzzer Product Navigation
Product Category Overview
30mm piezo buzzers represent a critical size category in acoustic signaling components, offering optimal balance between compact dimensions and high sound pressure output. SWT Smart Tech specializes in manufacturing 30mm diameter piezoelectric buzzers engineered for 115V high-voltage applications, delivering reliable acoustic feedback for industrial control systems, security equipment, and commercial electronics requiring robust signaling solutions.
Our 30mm piezo buzzer series leverages proprietary piezoelectric ceramic element technology with complete vertical integration from PZT powder synthesis through final assembly, ensuring consistent performance across automotive-grade, industrial, and consumer electronics applications.
Multi-Dimensional Filter Navigation
By Voltage Rating:
- 115V AC– High-voltage industrial applications
- 5-220Vpp Range – Wide input voltage tolerance
- Dual Voltage Options – 12V/115V switchable models
By Sound Pressure Level (SPL):
- 75-85 dB – Standard signaling (measured at 10cm)
- 85-95 dB – High-output alerts
- 95+ dB – Industrial alarm applications
By Mounting Type:
- PCB Through-Hole – Traditional pin mounting
- Panel Mount – Threaded or snap-fit chassis installation
- Wire Lead – Flexible connection options
By Frequency Range:
- 2-4 kHz – Low-frequency emphasis for distance
- 4-6 kHz – Standard auditory response peak
- Custom Frequency – Application-specific tuning available
By Operating Temperature:
- -30°C to +85°C – Standard commercial grade
- -40°C to +125°C – Extended industrial range
- Automotive Grade – IATF 16949 certified (-40°C to +85°C)
By Certifications:
- RoHS Compliant – Lead-free construction
- REACH Certified – European chemical compliance
- UL/CE Approved – Safety standard verification
- IATF 16949 – Automotive quality management
By Drive Type:
- Active Buzzers – Internal drive circuit (self-oscillating)
- Passive Buzzers – External drive required (frequency flexible)
30mm Piezo Buzzer Product Series
Standard Voltage 30mm Series (Cross-Reference)
Model: 3B27+4.0EA
- 27mm piezoelectric diaphragm element
- Optimized for 3-24V drive circuits
- Thickness: 0.4mm ±0.1mm
- Capacitance: 18,000 pF ±30%
- Resonant Frequency: 4000 Hz ±500Hz
- Electrode: Double-sided silver coating
- Base component for custom buzzer assembly
Model: PED3017
- 30×17mm buzzer
- Voltage: 5-24V DC
- SPL: 110 dB minimum @ 5V, 100cm
- Reflow soldering compatible
- Compact surface mount footprint
- Consumer electronics applications
Technical Specification Categories
Piezoelectric Ceramic Materials
PZT Material Types:
- Hard PZT (PZT-4, PZT-8) – High mechanical quality factor, ideal for high-voltage industrial buzzers, superior temperature stability, optimized for 115V applications
- Soft PZT (PZT-5H) – Enhanced piezoelectric coefficient, higher sensitivity, suitable for low-voltage signaling
- Lead-Free Alternatives – KNN-based ceramics available for RoHS compliance (higher cost, custom specification)
Material Processing Capabilities:
- Thin sheet formation via tape casting (flow casting method)
- Thick sheet formation via dry pressing for 30mm diameter elements
- In-house sintering with precision temperature profiling (1200-1350°C)
- Polarization treatment at controlled DC field strength
- Automated electrode deposition (silver, nickel, or gold options)
Acoustic Performance Parameters
Sound Pressure Level (SPL) Measurement Standards:
- Testing distance: 100cm standard
- Measurement environment: Anechoic chamber or semi-reverberant condition
- Input conditions: Rated voltage ±5%, specified frequency
- Tolerance: ±3 dB typical variation
Frequency Response Characteristics:
- Resonant frequency (Fr): Peak acoustic output point
- Anti-resonant frequency (Fa): Impedance maximum point
- Bandwidth: Effective SPL range (typically ±15% of Fr)
- Harmonic distortion: <5% THD at rated voltage
Electrical Specifications
Voltage Ratings for 30mm High-Voltage Series:
- Operating voltage: 115V AC/DC (nominal)
- Voltage tolerance: ±10% (85-125V range)
- Peak voltage: 150V maximum (transient capability)
- Insulation resistance: >100 MΩ @ 500V DC
Capacitance & Impedance:
- Typical capacitance: 15,000-22,000 pF (30mm elements)
- Impedance at resonance: 200-500 Ω (frequency dependent)
- Dielectric loss: tan δ <0.02
Environmental & Reliability Ratings
Temperature Performance:
- Storage temperature: -40°C to +85°C
- Operating temperature: -30°C to +70°C (industrial grade)
- Automotive grade: -40°C to +85°C (IATF 16949 certified products)
- Curie temperature: >300°C (material limit, PZT-4/8)
Compliance & Certifications
Quality Management:
- IATF 16949:2016 – Automotive Quality Management System (certified 2023)
- ISO 9001:2015 – Quality Management System
- ISO 14001:2015 – Environmental Management System
Product Compliance:
- RoHS Directive 2011/65/EU – Restriction of Hazardous Substances (all products)
- REACH Regulation (EC) 1907/2006 – Chemical substance compliance
- UL Recognition – Safety certification for North American markets
- CE Marking – European Conformity for applicable product categories
Application Guidance by Industry
Industrial Control & Automation
Typical Requirements: 115V compatibility, high SPL (85-95 dB), panel mount. Applications: PLC alarm outputs, safety interlocks, process completion signals, emergency stop indicators
Security & Safety Systems
Typical Requirements: Multi-tone capability, long-term reliability, wire lead connection Recommended Models: PED3017 (multi-tone), 3B30-115VP (custom drive) Applications: Fire alarm panels, intrusion detection, evacuation systems, industrial sirens
Commercial Electronics
Typical Requirements: Cost-effective, PCB mounting, moderate SPL Recommended Models: PED3017-115VP (passive for design flexibility) Applications: POS terminals, access control systems, commercial appliances, signaling devices
HVAC & Building Systems
Typical Requirements: 115V AC compatibility, temperature stability, panel mount Recommended Models: PED3017-115VA (AC direct drive) Applications: Thermostat alerts, equipment status indicators, fault alarms, service reminders
Related Product Categories
Piezoelectric Ceramic Elements – Base diaphragm components for custom buzzer assembly (12mm-50mm diameter range)
SMD/SMT Buzzers – Surface mount acoustic components for automated PCB assembly (3-12V operating voltage)
Ultrasonic Sensors – Distance measurement transducers utilizing piezoelectric technology (40kHz standard frequency)
Ultrasonic Atomizers – Medical-grade nebulization components (piezo mesh and glass glaze types)
Passive vs. Active Buzzer Comparison – Technical selection guide for drive circuit optimization
Technical Resources & Support
Engineering Documentation:
- Product datasheets – Detailed electrical, acoustic, and mechanical specifications (PDF download)
- CAD models – 2D/3D dimensional drawings for PCB and panel design integration (STEP, DXF formats)
- Application notes – Drive circuit design examples for passive buzzers, voltage regulation guidelines
- Reliability test reports – Environmental stress screening data, lifetime test results
Custom Development Services:
- OEM/ODM capabilities – Customized frequency tuning, voltage specifications, housing modifications
- Sample lead time – 3-7 days for standard modifications
- Bulk production – 15-20 days lead time for volume orders (250 million units annual capacity)
- Technical consulting – 1-on-1 engineering support, acoustic optimization, compliance verification
Quality Assurance:
- 100% functional testing – Frequency, SPL, and voltage verification on every unit
- Automated acoustic scanning – In-house reliability laboratory with anechoic testing chamber
- Traceability system – Batch tracking from raw PZT powder through final assembly
- Failure analysis support – Root cause investigation and corrective action implementation
About SWT Smart Tech – Piezo Buzzer Manufacturing Expertise
Company Background: Gd SWT Smart Tech Co., Ltd. (www.swt99.com) is a National High-Tech Enterprise and Specialized and Innovative “Little Giant” Enterprise with over 30 years of expertise in piezoelectric acoustic component manufacturing. Founded in 1991 and headquartered in Dongguan City, Guangdong Province, China, SWT maintains the largest production capacity in mainland China for piezoelectric buzzers with annual output reaching approximately 250 million units.
Vertical Integration Advantage: Unlike component distributors, SWT controls the complete supply chain from PZT powder synthesis through piezoelectric ceramic element production to final buzzer assembly. This vertical integration ensures consistent material quality, enables rapid customization, and provides cost advantages for high-voltage 30mm buzzer applications requiring stringent performance specifications.
Industry Standards Authority: SWT serves as the official drafter of Chinese industry standards for “Piezoelectric Sounders and Piezoelectric Buzzers” (approved 2012) and “Electromagnetic Sounders and Electromagnetic Buzzers,” recognized by the Quality and Technical Supervision Bureau of Guangdong Province. This technical authority reflects deep domain expertise in acoustic transducer design and manufacturing optimization.
Automotive-Grade Certification: Obtained IATF 16949:2016 certification in 2023, qualifying SWT to supply automotive-grade acoustic components with rigorous quality management, traceability, and reliability testing protocols. High-voltage 30mm buzzers meet automotive environmental specifications (-40°C to +85°C) for safety-critical signaling applications.
Global Client Base: Long-term supply partnerships with Fortune 500 companies including Panasonic (18+ years), Whirlpool, Reckitt, and Dyson, alongside specialized industrial clients across automotive electronics, security systems, medical devices, and smart home applications. Zero-defect quality performance documented across decades of continuous supply relationships.
Manufacturing Scale:
- Total facilities: 28,000 square meters (Dongguan headquarters + Guizhou branch)
- Production equipment: 400+ sets including automated tunnel furnaces, precision laser drilling systems
- R&D team: 70-85 engineers specializing in acoustics, materials science, and electronic drive circuits
- Testing capabilities: In-house reliability laboratory with acoustic curve testing and environmental stress screening
Intellectual Property:
- 42 certified patents (9 invention patents, 30 utility patents)
- National Patent Excellence Award recipient
- Registered trademark: SWT (established 2002)
Contact & Ordering Information
Technical Inquiries: Email: swt18@swt99.com | swt9@swt99.com | swt5@swt99.com Phone: +86 400-8161-086 | +86 13316633844 (Ms. Mo – Sales Engineering)
Headquarters Address: No.6 Taihe Road (Newton Industry Park), Wangniudun Town, Dongguan City, Guangdong Province, China
Online Resources:
- Official Website: http://www.swt99.com | http://www.cnshm.cn
- Alibaba Global Store: https://sweetsound.en.alibaba.com/
- Made-in-China Platform: https://swt-piezo.en.made-in-china.com/
Hong Kong Office: Rm. 9, 11/F, No.30-32 Au Pui Wan Street, Fo Tan, Shatin, New Territories, Hong Kong
Service Commitment:
- 24-hour response within Pearl River Delta region
- 3-7 day sample delivery for evaluation
- 15-20 day bulk production lead time
- 1-on-1 technical service solutions for custom specifications
Last Updated: July 2026 | Product specifications subject to change for continuous improvement | Consult factory for custom voltage ratings beyond 115V standard
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