2316 Active Piezoelectric Buzzer

For equipment that already provides a DC power rail, the 2316 Active Piezoelectric Buzzer offers a self‑contained audible alert solution that requires no external audio driver or signal generator. Inside its black ABS housing — 23 mm in diameter and 16 mm tall — a Φ23 mm piezo diaphragm is paired with a built‑in oscillation circuit. Applying any voltage between 3 V and 24 V DC immediately produces a tone centered at 3000 Hz. When powered at the nominal 12 VDC, sound pressure level reaches at least 90 dB at a 10 cm distance, while current consumption stays below 10 mA. The unit weighs 5 g and installs through standard through‑hole pins, making it straightforward to integrate into wave‑soldered or hand‑assembled boards.

Built‑in oscillation — DC voltage directly produces 3000 Hz tone

12 VDC rated, 3–24 VDC operating range

≥90 dB SPL at 10 cm, ≤10 mA consumption under specified test conditions

Φ23.0 × 16.0 mm through‑hole package, 5 g

Continuous operation from -20 ℃ to +80 ℃

Oscillator Architecture & Electrical Behavior

The internal circuit of the 2316 Active Piezoelectric Buzzer is a self‑oscillating topology that excites the piezoelectric diaphragm at its mechanical resonance. The designer only needs to provide a DC voltage within 3–24 V; the on‑board IC handles frequency generation and drive waveform shaping. This eliminates the need for an external clock source and simplifies PCB layout.

Current consumption is specified at ≤10 mA when measured with a 12 Vp‑p square wave at 3000 Hz, and actual draw under DC operation typically falls below 6 mA, as shown in the test report. The wide supply tolerance accommodates battery voltage decay, unregulated adapters, and industrial bus fluctuations without affecting tone stability.

For soldering, both wave (260 ℃, 4–6 s) and manual (350 ℃, 2–5 s) methods are compatible, with a maximum of 2–3 thermal cycles. The recommended clearance between the housing and the solder bath is 2.0 mm.

Application Examples

DC‑powered machine status panels in factories, operating on 12 V or 24 V bus.

Medical devices such as patient monitors or infusion pumps, where a simple DC alert tone is required without additional signal lines.

Security alarm keypads and access controllers with through‑hole PCB assembly.

Automotive cabin indicators (door‑open chime, seatbelt warning) powered from a 12 V battery rail.

Portable test instruments that run from a 3.7 V Li‑ion cell, utilizing the wide voltage range to maintain audibility as the battery discharges.

Handling & Operating Notes

1. Apply only DC voltage within 3–24 V. Transients or reverse polarity may permanently damage the internal IC.

2. The housing is not sealed. Prevent liquids, flux residue, or cleaning solvents from entering the sound port.

3. In environments with corrosive gases (e.g., H₂S, SO₂), house the buzzer in a protected compartment or use conformal coating on the terminals only.

4. Sound output is sensitive to supply voltage. Verify that your power rail can deliver the required current, especially when multiple buzzers share the same source.

5. Do not block the acoustic opening. Even a partial obstruction can reduce SPL by several decibels and shift the frequency.

6. Store in sealed bags with desiccant until assembly. Moisture can oxidize pins and affect solderability.

Frequently Asked Questions

1. Does the HND‑2316 need an external signal to produce sound?

No. The built‑in oscillator generates the 3000 Hz tone as soon as a DC voltage is applied. There is no need for a microcontroller, timer IC, or PWM signal.

2. Why does the test report use a square wave when the buzzer runs on DC?

The 12 Vp‑p square wave is a characterization standard used to verify acoustic performance under controlled electrical conditions. Under DC supply, the internal circuit produces a similar drive waveform. For DC‑drive SPL data, contact MEIDI.

3. The specification mentions ≤10 mA, but the test report header sometimes states ≤15 mA. Which value applies?

The product parameter table's ≤10 mA is the primary specification. The ≤15 mA figure in some test report headers is a documentation inconsistency. Actual sample measurements (typically around 5 mA) confirm the lower limit. MEIDI can provide a specification clarification for your order.

4. Can I use the HND‑2316 with a 3.3 V microcontroller supply?

Yes, as long as the 3.3 V rail is within the 3–24 V operating range and can source the required current. SPL will be lower than at 12 V; contact MEIDI for voltage‑vs‑SPL characterization curves.

5. What soldering profile is recommended for wave soldering?

Wave soldering at 260 ± 5 ℃ for 4–6 seconds, with the housing kept at least 2.0 mm from the solder wave. Up to 2–3 passes are allowed. Manual soldering at 350 ℃ for 2–5 s is also acceptable.

6. Is the HND‑2316 suitable for outdoor use?

The operating temperature range supports mild outdoor conditions, but the housing is not weatherproof. If exposure to rain or dust is possible, place the buzzer inside a ventilated water‑resistant enclosure.

Technical Inquiry

For datasheets, DC‑drive characterization, reliability reports, or application support for the HND‑2316, contact MEIDI with your requirements. Engineering response is typically within one business day.