The MEIDI HN-4739 is a piezoelectric active buzzer with an internal oscillator circuit. Unlike passive buzzers that require an external PWM or AC drive signal, the active design operates from a DC supply, reducing component count and simplifying circuit integration.
The HN-4739 is offered in 12VDC and 24VDC nominal voltage options, both producing a 2900±500Hz tone with ≥105dB sound pressure. The 47.3×39.3×23.5mm rectangular housing and approximately 15g weight suit panel-mount and enclosure-mount alert applications. With built-in drive electronics, this piezoelectric active buzzer is well suited for equipment where a simple DC-on/off control signal is preferred over a dedicated oscillator circuit.
Built-in oscillator — DC drive eliminates the need for external PWM or signal-generation circuitry
High sound pressure output — ≥105dB acoustic output for attention-critical alerts
Dual voltage options — available in 12VDC and 24VDC to match common industrial and automotive supply rails
2900Hz operating frequency — factory-set tone frequency with ±500Hz tolerance
Compact panel-mount housing — 47.3×39.3×23.5mm form factor with mounting holes
| Parameter | HN-4739-12V | HN-4739-24V | Test Conditions |
| Product Type | Piezoelectric Active Buzzer | Piezoelectric Active Buzzer | — |
| Rated Voltage | 12 VDC | 24 VDC | — |
| Operating Frequency | 2900 ±500 Hz | 2900 ±500 Hz | At rated voltage |
| Sound Pressure Level | ≥105 dB | ≥105 dB | At rated voltage, 10cm |
| External Dimensions | 47.3 × 39.3 × 23.5 mm | 47.3 × 39.3 × 23.5 mm | Per source specification |
| Net Weight | Approx 15 g | Approx 15 g | Per source specification |
| Environmental Compliance | RoHS | RoHS | — |
Industrial control panels — alarm and status tones driven directly from PLC or relay outputs
Automotive and transportation — 12VDC and 24VDC options match common vehicle supply rails
Security and access systems — intrusion alerts, door-open warnings, and status beeps
Test and instrumentation — fault and completion indicators requiring simple DC drive
General electronic equipment — power-on alerts, error notifications, and operator feedback
| Design Requirement | HN-4739 Advantage |
| Simple drive circuit | Built-in oscillator operates from DC voltage; no external PWM required |
| High SPL alert | ≥105dB output for high-noise industrial environments |
| 12V or 24V systems | Dual voltage variants cover common DC supply rails |
| Panel mounting | Rectangular housing with mounting holes for secure chassis installation |
| Fast integration | Active design reduces BOM and firmware complexity |
MEIDI manufactures the HN-4739 piezoelectric active buzzer under controlled production processes. Each production lot undergoes:
Frequency verification — operating frequency test at 2900±500Hz
SPL verification — sound pressure output check at rated voltage
Voltage option screening — separate electrical tests for 12VDC and 24VDC variants
Dimensional inspection — 47.3×39.3×23.5mm body dimension check
Visual inspection — housing integrity, wire lead, and mounting-hole alignment check
Products are manufactured with RoHS-compliant materials. Contact MEIDI for detailed quality documentation and test reports.
1. Does the HN-4739 require an external oscillator or PWM signal?
No. The HN-4739 is a piezoelectric active buzzer with a built-in oscillator. It produces sound when DC voltage within its rated range is applied across the power leads.
2. What is the difference between HN-4739-12V and HN-4739-24V?
The two variants share the same mechanical dimensions, 2900±500Hz frequency, and ≥105dB SPL. They differ only in rated DC voltage: 12VDC or 24VDC. Select the variant that matches your system supply rail.
3. What sound pressure level can I expect from the HN-4739?
The source specification lists ≥105dB sound pressure level at rated voltage, measured at 10cm. Contact MEIDI for detailed acoustic test conditions and distance-versus-SPL data.
4. What are the mounting dimensions of the HN-4739?
The external housing dimensions are 47.3×39.3×23.5mm. The housing includes mounting holes for panel or chassis installation. Contact MEIDI for a detailed mechanical drawing with mounting-hole spacing.
5. Is the HN-4739 suitable for continuous operation?
Contact MEIDI for duty-cycle recommendations and reliability data. Continuous operation ratings depend on ambient temperature, supply voltage, and specific application conditions.
For technical datasheets, voltage-variant samples, or OEM configuration discussion, contact MEIDI. Product specifications and qualification documentation are available under mutual NDA.
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