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Resonant frequency: 4.0 ± 0.5 kHz.
Free capacitance: 25,000 / 2,600 pF ± 30% at 120 Hz.
Equivalent resistance: ≤ 500 Ω.
Dielectric loss: ≤ 5%. Operating temperature: -20 °C to +70 °C.
Storage temperature: -30 °C to +80 °C.
Dimensions: T 0.44 ± 0.04 mm, T1 0.20 ± 0.02 mm, D1 27.0 +0/-0.1 mm, D2 20.0 ± 0.3 mm.
Contact MEIDI for bulk pricing, free evaluation samples, or a custom configuration quote.
The FT-27T-4.0B1-C25 is a 27mm Piezo Ceramic Buzzer Element bonded to a brass substrate, designed for tone generation in audible alert systems. With a resonant frequency of 4.0 kHz and a compact 0.44 mm profile, it fits easily into space‑constrained acoustic housings. MEIDI manufactures this element under controlled ceramic polarization and electrode adhesion processes, ensuring stable performance across production batches. It is commonly sourced by manufacturers of security alarms, medical call buzzers, and industrial panel indicators.
Resonant frequency: 4.0 ± 0.5 kHz per specification
Free capacitance: 25,000 / 2,600 pF ± 30% at 120 Hz per specification
Dimensions: 27.0 mm diameter, 0.44 mm thickness per specification
Brass substrate for consistent acoustic vibration coupling
Operating temperature: -20 °C to +70 °C per specification
| Parameter | Value | Unit |
| Product Type | Piezoelectric Ceramic Element | — |
| Resonant Frequency | 4.0 ± 0.5 | kHz |
| Free Capacitance | 25,000 / 2,600 ± 30% | pF (at 120 Hz) |
| Equivalent Resistance | ≤ 500 | Ω |
| Dielectric Loss (tanδ) | ≤ 5% | — |
| Operating Temperature | -20 ~ +70 | °C |
| Storage Temperature | -30 ~ +80 | °C |
| Substrate Material | Brass | — |
| Total Thickness (T) | 0.44 ± 0.04 | mm |
| Ceramic Thickness (T1) | 0.20 ± 0.02 | mm |
| Outer Diameter (D1) | 27.0 +0 / -0.1 | mm |
| Inner Diameter (D2) | 20.0 ± 0.3 | mm |
Security alarm panels and access control warning systems
Medical equipment audible alerts (patient monitors, infusion pumps)
Automotive dashboard chimes and parking sensor indicators
Industrial control panel status beepers
Smart home devices (door/window sensors, water leak detectors)
Portable consumer electronics with acoustic feedback
The 27mm Piezo Ceramic Buzzer Element is produced in MEIDI's ISO 9001‑certified facility. Our process covers ceramic powder preparation, tape casting, electrode printing, polarization, and bonding onto brass substrates. Every production lot is tested for resonant frequency, capacitance, and mechanical integrity. With automated optical inspection and acoustic response verification, we maintain consistent output suitable for medium‑ to high‑volume supply. Long‑term inventory planning ensures stable lead times for repeat orders.
1. Do not apply drive voltage beyond the rated operating range specified for the FT-27T-4.0B1-C25. Over‑voltage may cause irreversible depolarization or substrate separation.
2. Handle by the brass edge only; avoid direct pressure on the ceramic surface to prevent micro‑cracks that can shift resonant frequency.
3. Protect from corrosive gases, salt spray, and condensation during storage and assembly. Corrosion of the brass substrate can reduce mechanical Q and output level.
4. Keep elements in their original sealed packaging until mounting. Exposure to high humidity may increase dielectric loss and degrade solderability.
5. When mounting, support the substrate around its perimeter only. Restricting the central vibrating area will alter the acoustic performance and may cause premature failure.
A: Standard MOQ is 1,000 pieces. For trial runs or prototype builds, we can supply smaller quantities with a slight price adjustment. Please inquire for a tailored quotation.
A: Yes, we offer free samples of this 27mm piezo element to qualified OEMs and distributors. Express shipping charges may be applied depending on the destination.
A: Customization is available within certain ranges. Our R&D team can modify ceramic composition, thickness, and electrode pattern to meet your target frequency or capacitance. Contact us with your requirements.
A: The product is manufactured under ISO 9001 and can be supplied with RoHS and REACH compliance certificates. Material safety data sheets and test reports are available upon request.
A: Elements are packed in anti‑static conductive trays, vacuum‑sealed with desiccant, and placed in reinforced export cartons. Custom labeling and barcoding options are supported for high‑volume shipments.
For a complete datasheet, drawing, or integration advice for the FT-27T-4.0B1-C25 27mm piezoelectric ceramic element, please contact MEIDI with your application details. Our engineering team will respond with specific recommendations within one business day.
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No.6, Wenlin Road, Chenbao Town, Xinghua City, Jiangsu Province, China
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