English
The HND-4216 is a 42 mm‑class active piezoelectric buzzer with a built‑in drive circuit, housed in a black ABS body. 4216 Active Piezoelectric Buzzer operates directly from a DC supply in the 3 V to 24 V range and produces a nominal 2800 Hz tone without the need for an external oscillator. The Φ41.8 mm diaphragm, combined with a 16 mm profile, provides a larger radiating area than typical 23 mm models, supporting broader sound dispersion. At the rated 12 VDC, current draw is specified at 8 mA. This through‑hole component is commonly integrated into industrial alarm panels, automotive warning systems, medical device alerts, and public announcement equipment where a lower‑frequency audible signal is preferred.
Built‑in oscillation — DC voltage directly produces 2800 Hz tone
12 VDC rated, 3–24 VDC operating range
8 mA current consumption at rated voltage
2800 ± 500 Hz resonant frequency — lower pitch than 3000 Hz+ variants
12 g mass, Φ41.8 × 16 mm dimensions, through‑hole mounting
Φ41.8 mm diaphragm — provides a wider effective radiating area compared to 23 mm‑class buzzers, resulting in broader acoustic coverage in open‑face mounting
2800 Hz center frequency — lower tonal character than 3000 Hz or 3700 Hz variants, suitable for applications where a less piercing alert is desired
Fixed 8 mA current consumption at 12 VDC — simplifies power budget planning in multi‑load designs
Wide 3 V to 24 V DC supply range — compatible with battery‑operated devices and 12 V/24 V industrial power rails
Wave and manual soldering supported — meets standard through‑hole assembly processes
| 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 | ≥90 dB (Min 90) | Tested with 12 Vp‑p square wave, 2800 Hz, 10 cm; DC‑drive performance data available upon request |
| Current Consumption | 8 mA (typ.) | At rated voltage; test reports may indicate ≤8 mA; contact MEIDI for batch data |
| Operating Temperature | -20 ℃ ~ +80 ℃ | Continuous |
| Storage Temperature | -30 ℃ ~ +85 ℃ | Non‑operating |
| Dimensions (Dia × H) | Φ41.8 ± 0.3 × 16 ± 0.2 mm | Body only |
| Weight | 12 g | — |
| Housing Material | Black ABS | — |
| Capacitance | 12 ± 40% nF | Reference value per specification header; not measured on individual samples |
| Mounting Type | Through‑Hole | Wave / Manual solder |
Industrial control panels and machine status indicators requiring a lower‑frequency alert
Automotive audible signals (seatbelt reminders, headlight‑on warnings, parking sensor beepers)
Medical equipment alarms (patient monitors, infusion pumps, diagnostic devices)
Security and fire alarm sounders where broader sound coverage is beneficial
Uninterruptible power supplies (UPS) and power distribution units with DC bus voltage
Public information kiosks, queue management displays, and transportation announcement panels
MEIDI produces the 4216 Active Piezoelectric Buzzer in its Jiangsu manufacturing facility, which is equipped with automated assembly lines for piezoelectric buzzers, injection molding machines for ABS housings, and dedicated acoustic test stations. Each production batch is subjected to a seven‑item reliability protocol that includes humidity exposure, high and low temperature storage, thermal cycling, drop testing, vibration endurance, and solder heat resistance. Test parameters are set to HND‑4216 specification levels.
The quality management system operates under ISO 9001. Incoming materials are inspected, in‑process controls are applied, and 100% final acoustic testing is performed. Sound pressure level, resonant frequency, and current consumption are verified to ensure compliance with the published specification. For repeat orders, batch consistency is maintained through statistical process monitoring.
A ten‑sample test report for model HND-4216 is available. Measurements were taken with a 12 Vp‑p square wave at 2800 Hz, at 10 cm. The recorded SPL values range from 101 dB to 107 dB, all exceeding the 90 dB minimum specification. Resonant frequencies fall between 2860 Hz and 2950 Hz, within the 2800 ± 500 Hz window. Dimensional measurements confirm compliance with the Φ41.8 × 16 mm design.
| Sample | SPL (dB) | Frequency (Hz) | Diameter (mm) | Height (mm) |
| 1 | 103 | 2900 | 42.00 | 16.00 |
| 2 | 101 | 2950 | 41.82 | 16.01 |
| 3 | 103 | 2860 | 41.79 | 16.02 |
| 4 | 105 | 2920 | 42.00 | 15.99 |
| 5 | 102 | 2930 | 41.83 | 16.01 |
| 6 | 102 | 2890 | 41.88 | 16.03 |
| 7 | 104 | 2860 | 41.82 | 16.02 |
| 8 | 101 | 2940 | 41.86 | 16.01 |
| 9 | 105 | 2940 | 41.85 | 16.05 |
| 10 | 107 | 2930 | 41.88 | 16.03 |
Conclusion: PASS. Appearance and polarity are acceptable. Current consumption data is not included in this test report; refer to the parameter table for the 8 mA specification. Contact MEIDI for batch‑specific current measurements.
1. Operate only within the 3–24 VDC range. Voltage outside this range may damage the internal oscillator or piezo diaphragm.
2. The housing is not sealed. Prevent water, flux residue, or adhesive from entering the sound port, which can shift frequency and reduce output.
3. Avoid exposure to corrosive gases (H₂S, SO₂, etc.) and high humidity. Such conditions may oxidize internal contacts and degrade performance.
4. Sound pressure level is influenced by supply voltage and source current capability. Verify that your drive circuit meets the required parameters.
5. Ensure the front acoustic port remains unobstructed. Blockage will reduce SPL and alter the effective frequency.
6. Store in original desiccated packaging until assembly to prevent moisture uptake and pin oxidation.
1. How does the HND-4216 differ from smaller‑diameter models in the MEIDI lineup?
The 4216 Active Piezoelectric Buzzer uses a Φ41.8 mm diaphragm and weighs 12 g, compared to Φ23.0 mm and 5 g for the HND‑2316 series. Its resonant frequency is 2800 ± 500 Hz, lower than the 3000 Hz or 3700 Hz options. Current consumption is specified at 8 mA, whereas the 23 mm series may draw up to 10 mA.
2. What are the exact sound pressure test conditions for the HND-4216?
The specification lists ≥90 dB. The test protocol uses 12 Vp‑p square wave at 2800 Hz, measured at 10 cm. For DC‑drive SPL curves or alternative test setups, contact MEIDI with your requirements.
3. Why does the test report lack current consumption data?
The standard test report includes SPL, frequency, and dimensional checks. Current consumption is specified as 8 mA in the product parameter table. Batch current verification can be provided upon request.
4. What PCB footprint clearance is required for the HND-4216?
The body diameter is Φ41.8 ± 0.3 mm. Contact MEIDI for the recommended hole pattern and keep‑out zone drawing to ensure proper clearance and acoustic performance.
5. How does the 12 g mass affect mounting reliability?
The 12 g mass is higher than that of smaller buzzers. In high‑vibration environments, the through‑hole solder joints should be evaluated for mechanical stress. MEIDI can provide mounting guidelines upon request.
6. Why does the test report use a square wave for an active buzzer?
The HND-4216 is rated for DC operation with internal oscillation. The 12 Vp‑p square wave at 2800 Hz is the standard characterization condition. DC performance data is available separately.
To obtain full datasheets, mechanical drawings, SPL frequency response plots, or reliability test data for the HND-4216, please contact MEIDI with your application details. 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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