English
The HND-4218 is a 42 mm diameter active piezoelectric buzzer with a built‑in oscillation circuit, housed in a black ABS enclosure. Applying a DC voltage within the 3 V to 24 V range directly generates a nominal 2800 Hz audible tone, eliminating the need for an external signal source. Its larger radiating surface, compared to 23 mm‑class buzzers, contributes to a sound pressure level of at least 90 dB at 10 cm under rated drive conditions. This through‑hole component is commonly selected for industrial control panels, automotive warning indicators, medical device alerts, and security system annunciators where a loud, consistent tone is required.
Built‑in oscillation circuit — DC voltage applied directly produces audible output
12 VDC rated, 3–24 VDC operating range
8 mA current consumption per specification
2800 ± 500 Hz resonant frequency
42 × 18 mm ABS housing, through‑hole mounting
Integrated drive circuit — accepts DC voltage directly and outputs a 2800 Hz tone without external oscillator components
42 mm diaphragm housed in a rigid ABS body — provides a larger effective radiating area than typical 23 mm buzzers, supporting higher sound output in open‑face mounting
Wide supply range — operates from 3 V to 24 V DC, suitable for both battery‑powered and industrial voltage rail designs
Compatible with wave soldering (260 °C) and manual soldering (350 °C), up to 2–3 thermal cycles per specification
| Parameter | Value | Test Conditions / Notes |
| Product Type | Piezoelectric Active Buzzer | — |
| Rated Voltage | 12 VDC | — |
| Operating Voltage | 3–24 VDC | — |
| Resonant Frequency | 2800 ± 500 Hz | — |
| Sound Output at 10 cm | Min 90 dB | 12 Vp‑p square wave, 2800 Hz, 10 cm (per test protocol); DC‑drive SPL values available on request |
| Current Consumption | 8 mA (typ.) | Tested at rated voltage; individual test reports may indicate ≤8 mA |
| Operating Temperature | -20 ℃ ~ +80 ℃ | Continuous operation |
| Storage Temperature | -30 ℃ ~ +85 ℃ | Non‑operating |
| Dimensions (Dia × H) | 42 × 18 mm | Body only; drawing tolerances ±0.5 mm unless otherwise specified |
| Weight | 12 g | — |
| Housing Material | Black ABS | — |
| Mounting Type | Through‑Hole | Wave or manual soldering |
| Method | Temperature | Time | Max Cycles |
| Wave Soldering ★ | 260 ± 5 ℃ | 4–6 s | 2–3 |
| Manual Soldering | 350 ± 10 ℃ | 2–5 s | 2–3 |
★ Recommended process for volume production
Industrial control panels and machine status indicators
Automotive audible warnings (seatbelt reminders, parking sensor alerts)
Medical device alarms (patient monitors, infusion pumps)
Security system annunciators and fire alarm sounders
Uninterruptible power supply (UPS) fault indicators
Public information displays and kiosk audible signals
MEIDI manufactures the 4218 Active Piezoelectric Buzzer in its Jiangsu production base, which houses automated assembly lines for piezoelectric buzzers, in‑house injection molding for ABS housings, and dedicated acoustic test stations. Each production lot undergoes a reliability verification protocol that includes humidity exposure, high/low temperature storage, thermal cycling, drop testing, vibration endurance, and solder heat resistance — all conducted at HND‑4218 specification levels.
Our quality management system operates under ISO 9001, with incoming material inspection, in‑process monitoring, and 100% final acoustic testing before shipment. For volume procurement, we can provide batch‑specific test data, including SPL frequency response curves and current consumption records.
The following data reflects the HND‑4218 specification. A product‑specific test report with sample measurement data is available upon request. The test protocol applies 12 Vp‑p square wave at 2800 Hz, measured at 10 cm. For DC‑drive characterization, please contact MEIDI engineering support.
| Item | Specification |
| Sound Pressure Level | Min 90 dB |
| Frequency | 2800 ± 500 Hz |
| Current | 8 mA (typical) |
| Dimensions | 42 × 18 mm |
For the complete HND‑4218 test report or reliability test data, submit a technical inquiry.
1. Operate only within the 3–24 VDC range. Voltages outside this range may damage the internal oscillator or piezo element.
2. This buzzer is not sealed. Avoid water, flux residue, or adhesive ingress through the sound port, which can alter frequency and reduce output.
3. Prolonged exposure to corrosive gases (e.g., H₂S, SO₂) or high humidity may degrade the brass substrate and electrode connections.
4. Sound pressure level depends on supply voltage and source current capability. Verify that your driving circuit can deliver sufficient current under load.
5. Keep the front acoustic port clear of obstructions. Even partial blockage will reduce SPL and shift the perceived frequency.
6. Store in original desiccated packaging to prevent moisture absorption and pin oxidation before soldering.
1. Does the HND-4218 require an external oscillator circuit?
No. The 4218 Active Piezoelectric Buzzer is an active piezoelectric buzzer with a built‑in oscillation circuit. Applying a DC voltage within the rated range produces an audible 2800 Hz tone directly.
2. What is the minimum voltage at which the buzzer will operate reliably?
The specified operating voltage range is 3 VDC to 24 VDC. The device will function at 3 VDC; however, sound pressure level increases with applied voltage. For low‑voltage performance curves, contact MEIDI for application characterization data.
3. Can this buzzer be used in outdoor or high‑humidity environments?
The HND-4218 has an open structure and is not designed for waterproof or high‑humidity applications. Exposure to moisture, condensation, or corrosive atmospheres may cause performance drift. For environmentally protected installations, review application notes or consult MEIDI for alternative sealing options.
4. What soldering method is recommended for this through‑hole buzzer?
Wave soldering at 260 °C for 4–6 seconds is the recommended method for volume production. Manual soldering at 350 °C for 2–5 seconds is also acceptable. Limit thermal exposure to 2–3 cycles as specified to avoid housing deformation.
5. Is the output frequency fixed, or does it vary with voltage?
The internal oscillator maintains a stable frequency near 2800 Hz across the operating voltage range. While SPL varies with voltage and load, the frequency shift is minimal within the specified supply range.
6. Why does the test protocol use a 12 Vp‑p square wave for an active buzzer?
The 12 Vp‑p square wave at 2800 Hz is the standard characterization condition for specification consistency. The HND-4218 is rated for 12 VDC operation with internal drive; DC performance data is available upon request.
To request the full datasheet, mechanical drawings, SPL frequency response curves, or reliability test data for the HND‑4218, contact MEIDI with your application requirements. Engineering support typically responds within one business day.
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No.6, Wenlin Road, Chenbao Town, Xinghua City, Jiangsu Province, China
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