2319 Active Piezoelectric Buzzer

The HND-2319 is a 23 mm‑diameter active piezoelectric buzzer with an integrated drive circuit, housed in a black ABS body. 2319 Active Piezoelectric Buzzer operates across a 3 V to 24 V DC supply range and produces a nominal 3700 Hz tone at the rated 12 VDC. The taller 19 mm housing, compared to 16 mm variants in the same diameter class, provides an enlarged acoustic chamber that contributes to a distinct tonal character. Current consumption is specified at ≤10 mA under the standard 12 Vp‑p, 3700 Hz test condition. With a mass of 5 g and a through‑hole footprint identical to the HND‑2316 series, this buzzer is a practical choice for designs that require a higher alert frequency without altering PCB layout.

Built‑in oscillation circuit — DC voltage directly generates 3700 Hz tone

12 VDC rated, 3–24 VDC operating range

≥90 dB sound output at 10 cm under 12 Vp‑p, 3700 Hz square wave

Current consumption ≤10 mA at rated frequency and voltage

Φ23 × 19 mm black ABS housing, through‑hole mounting, 5 g

Frequency Response & Acoustic Design

The H2319 Active Piezoelectric Buzzer is tuned to a resonant frequency of 3700 ± 500 Hz. This places its output in a higher audible band than the 3000 Hz HND‑2316, making it more suitable for environments where a sharper, more penetrating alert is preferred — such as open‑plan industrial floors or medical stations with competing background noise. The ±500 Hz tolerance band allows for normal production variation while keeping the tone within a consistent perceptual range.

The 19 mm housing height creates a larger internal cavity volume than the 16 mm variant. In piezoelectric buzzer design, cavity volume affects the Helmholtz resonance of the enclosed air mass and can influence both sound pressure level and frequency shaping. While the HND‑2319 and HND‑2316 share the same 23 mm diaphragm diameter, the additional internal volume in the HND‑2319 shifts the acoustic impedance characteristics, contributing to its distinct tonal output.

Both models share identical pin spacing and PCB footprint, allowing designers to evaluate different frequencies without board changes. The 5 g mass is manageable for standard through‑hole solder joints under normal operating vibration levels.

Typical Applications

Industrial machinery status indicators where a 3700 Hz alert cuts through low‑frequency background noise

Medical monitoring equipment requiring a distinct audible alarm separate from 3000 Hz device tones

Security alarm panels and access control systems with through‑hole PCB assembly

Automotive dashboard warnings (door‑open chimes, headlight reminders) using 12 V DC supply

Uninterruptible power supplies and power distribution units operating on 12–24 V DC bus

Consumer appliances and vending equipment benefiting from a higher‑pitched feedback tone

Precautions

1. Operate strictly within the 3–24 VDC range. Voltage beyond this may cause permanent damage to the internal oscillation circuit.

2. This product is not sealed. Avoid water, flux residue, or adhesive ingress through the sound port, which can alter frequency response and reduce output.

3. Exposure to corrosive gases or high humidity may degrade the piezo element and brass contacts over time. Store and operate in controlled environments.

4. Sound pressure level depends on supply voltage and source current capability. Verify your drive circuit can deliver sufficient current under load.

5. Keep the front acoustic port clear. Obstructions, baffles, or tightly fitted covers will reduce SPL and shift the effective frequency.

6. Store in original desiccated packaging until assembly to prevent moisture absorption and pin oxidation.

FAQ

1. How does the HND-2319 differ from the HND-2316 in the MEIDI lineup?

The 2319 Active Piezoelectric Buzzer is tuned to 3700 ± 500 Hz with a 19 mm housing height, while the HND‑2316 operates at 3000 ± 500 Hz with a 16 mm height. Both share the same 23 mm diameter, 12 VDC rating, 3–24 VDC operating range, and through‑hole footprint. The primary differences are frequency band and vertical clearance.

2. What is the significance of the 3700 Hz resonant frequency?

The 3700 Hz tone occupies a higher audible band than 3000 Hz, making it perceptually sharper. This can be advantageous in noisy environments or applications where multiple buzzers need distinct frequency separation. Frequency sweep data can be provided upon request.

3. Why does the test report show current ≤15 mA while the parameter table states ≤10 mA?

The discrepancy between the test report header (≤15 mA) and the product parameter table (≤10 mA) is a documentation inconsistency. Measured sample values are consistently around 5 mA. Contact MEIDI to confirm the correct specification for your procurement.

4. What vertical clearance is required for the HND-2319?

The body height is 19.0 ± 0.3 mm. Additional space should be allowed for through‑hole lead protrusion and solder fillets. Detailed mechanical drawings are available from MEIDI.

5. Can I swap the HND-2319 into an existing HND-2316 footprint?

Yes. Pin spacing and PCB hole pattern are identical. The only physical change is the 3 mm increase in height. Verify that your enclosure accommodates the taller profile before substitution.

6. Why does the test report use a square wave for an active buzzer?

The HND‑2319 is designed for DC operation with built‑in oscillation. The 12 Vp‑p square wave is the standardized characterization condition used in the test report. DC‑drive performance data is available separately.

Technical Inquiry

For complete datasheets, frequency characterization curves, current specification clarification, or PCB footprint drawings for the HND‑2319, contact MEIDI with your application details. Engineering support typically responds within one business day.