External square wave drive at 2400Hz for consistent acoustic output
42Ω coil impedance for through-hole PCB layouts
12mm diameter for common through-hole PCB layouts
Min. 85dB sound pressure at 10cm under rated drive conditions
-20℃ to +70℃ operating temperature range
Black PPO housing compatible with through-hole assembly processes
The MEIDI HN-1295 12mm 2400Hz Through-Hole Electromagnetic Passive Buzzer is an electromagnetic passive buzzer designed for through-hole mounting in electronic systems requiring external drive signal for sound generation. At 12mm body diameter, this buzzer integrates into common PCB layouts used in industrial control panels, alarm systems, consumer appliances, and diagnostic equipment.
The 2400Hz resonant frequency accepts external square wave drive signals, enabling consistent acoustic feedback when driven at or near the rated frequency. With a rated voltage of 5Vo-p and operating range of 3--7Vo-p, the HN-1295 provides flexibility in driver circuit design.
The 42Ω coil resistance is selected for through-hole mounting applications. The black PPO housing provides structural stability for through-hole assembly processes.
External drive architecture --- accepts square wave signals at 2400Hz for tone generation; requires AC excitation, DC voltage alone will not produce sound
Through-hole form factor --- 12mm diameter with pin configuration for standard PCB layouts
42Ω coil impedance --- for through-hole PCB layouts
Stable acoustic output --- Min. 85dB at 10cm when driven at 5Vo-p, 2400Hz, 50% duty cycle square wave
PPO housing material --- black housing for through-hole assembly compatibility
RoHS environmental compliance --- Yes
| Parameter | Value | Test Conditions |
| Product Type | Electromagnetic Passive Buzzer | --- |
| Rated Voltage | 5Vo-p | Resonant frequency reference |
| Operating Voltage | 3--7Vo-p | Drive signal peak |
| Sound Pressure Level | Min. 85dB | At 5Vo-p, 2400Hz, 50% duty, 10cm |
| Resonant Frequency | 2400Hz | At rated voltage |
| Coil Resistance | 42 ± 5Ω | --- |
| Rated Current | Max. 80mA | At 5Vo-p, 2400Hz, 50% duty |
| Operating Temperature | -20℃ ~ +70℃ | --- |
| Storage Temperature | -30℃ ~ +80℃ | --- |
| External Size | 12mm (diameter) | Body excluding pins |
| Net Weight | Approx. 1.5g | --- |
| Housing Material | Black PPO | --- |
| Environmental Protection Regulation | RoHS | --- |
Industrial control panel alarm modules requiring acoustic alerts
Security and intrusion detection systems with through-hole PCB designs
Consumer appliance control boards utilizing standard buzzer mounting
Diagnostic and test equipment needing audible status indication
PLC and automation systems with drive outputs
Uninterruptible power supply units for fault condition warnings
| Design Requirement | HN-1295 Advantage |
| Through-hole PCB layouts | 12mm diameter for standard PCB mounting |
| Consistent alarm tone frequency | 2400Hz resonant frequency for uniform acoustic character |
| Assembly process compatibility | Black PPO housing for through-hole assembly |
| Environmental compliance | RoHS |
MEIDI manufactures HN-1295 with quality control at each production stage from product design, purchasing, and testing. Contact MEIDI for certification details.
After any of the following tests, the product shall meet the acceptance criteria: no defects or degradation in appearance and electrical properties (except SPL); SPL shall not decrease by more than 10dB from the minimum SPL specified in the datasheet.
| Test Item | Test Conditions |
| Life Test | 25±10℃, rated voltage, 1/2 duty resonant frequency square wave, 96 hours |
| High Temperature Test | +80℃ storage for 96 hours, recover at room temperature for 3 hours before testing |
| Low Temperature Test | -40℃ storage for 96 hours, recover at room temperature for 3 hours before testing |
| Humidity Test | +40±3℃, 90%--95% RH, 48 hours, recover at room temperature for 6 hours before testing |
| Thermal Shock Test | 70℃ 2 hours → -20℃ 2 hours (1 cycle), interval 1 hour between cycles, total 10 cycles |
| Drop Test | Standard packaging (all 6 faces and 3 edges), drop from 1.2m height onto thick wood board or 5cm hard wood board |
| Vibration Test | 1000 cycles/min, amplitude 1.5mm, 1 hour per axis, 3 axes total |
Caution: Avoid foreign materials entering the product, including magnetic materials, water-soluble materials, and corrosive gases, as these will affect the electrical performance of the product.
| Item | Specification |
| Product Type | ELECTROMAGNETIC BUZZER |
| Quantity | 6000 PCS |
| Carton Volume | 52×41.5×27 CM |
1. Does this buzzer require an external drive signal, or can it be driven with DC voltage?
As a passive electromagnetic buzzer, HN-1295 requires an external AC signal --- typically a square wave at or near 2400Hz --- to generate audible output. DC voltage alone will not produce sound and may damage the coil through continuous current flow.
2. What driving frequency is recommended for maximum sound pressure output?
Maximum SPL occurs at the resonant frequency of 2400Hz. SPL decreases significantly when driven off-resonance. For consistent Min. 85dB output, drive at 2400Hz with 50% duty cycle square wave at 5Vo-p.
3. What driver circuit is suitable for the 42Ω coil impedance?
Standard open-collector NPN/PNP transistor configurations with pull-up resistors are compatible. For microcontroller GPIO direct drive, verify the port can source or sink ≥80mA. A flyback diode is recommended practice when driving with inductive loads or relay circuits.
4. What is the recommended soldering method for this through-hole buzzer?
HN-1295 is compatible with standard through-hole wave soldering processes. For manual soldering, contact MEIDI for recommended temperature and duration specifications.
5. Are custom resonant frequencies or coil resistances available?
Contact MEIDI for technical inquiries regarding custom configurations.
For technical datasheets, drive circuit application notes, or OEM configuration discussion, contact MEIDI applications engineering.
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No.6, Wenlin Road, Chenbao Town, Xinghua City, Jiangsu Province, China
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