External PWM drive for programmable tone generation
4000Hz resonant frequency for clean acoustic output
16×16×2.5mm footprint for high-density PCB integration
Max. 2mA current consumption at rated voltage
-20℃ to +70℃ operating temperature range
| Parameter | Value |
| Product Type | Piezoelectric Passive Buzzer |
| Rated Voltage | 5Vp-p |
| Operating Voltage | 1~20Vp-p |
| Sound Pressure Level | Min. 75dB |
| Current | Max. 2mA |
| Oscillation Frequency | 4000Hz |
| Operating Temperature | -20℃～+70℃ |
| Storage Temperature | -30℃～+80℃ |
| External Size | 16×16×H2.5 mm |
| Mass | 1g |
| Housing Material | LCP |
| Environmental Protection Regulation | RoHS |
Blood glucose meters requiring low-profile acoustic alerts
Clinical and forehead thermometers with space-constrained enclosures
Smart glasses needing compact audio feedback components
Portable terminals and handheld devices
Home appliances with external drive sound modules
Alarm systems utilizing PWM-controlled tone generation
| Design Requirement | MLT-1625 Advantage |
| Compact device integration | 16×16×2.5mm SMD profile fits high-density PCB layouts |
| External frequency control | Passive design accepts variable PWM drive for tone customization |
| Low power operation | Max. 2mA current draw at 5Vp-p rated voltage |
| Surface-mount assembly | LCP housing compatible with standard SMD reflow processes |
| Environmental compliance | RoHS approval for global distribution |
MEIDI manufactures MLT-1625 with quality control at each production stage from product design, purchasing, and testing. Production facilities maintain ISO 9001, ISO 14001, and QS 9000 certifications. All products carry CE mark and RoHS approvals.
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 be lower than 10dB below 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 (3 edges, 6 faces of box), 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 direction, 3 degrees of freedom |
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.
1. Does this buzzer require a PWM signal, or can it be driven with a simple DC voltage?
As a passive piezoelectric buzzer, MLT-1625 requires an external AC signal — typically a square wave or PWM at or near 4000Hz — to generate audible output. DC voltage alone will not produce sound.
2. What driving frequency is recommended for maximum sound pressure output?
Maximum SPL occurs at the resonant frequency of 4000Hz. SPL decreases significantly off resonance.
3. What is the recommended reflow soldering profile for this SMD buzzer?
MLT-1625 is compatible with standard SMD reflow processes. Contact MEIDI for the complete reflow profile specifications.
4. Are custom resonant frequencies or dimensions available?
Contact MEIDI for technical inquiries regarding custom configurations.
5. How does the piezoelectric construction affect long-term reliability?
Piezoelectric buzzers have no moving coil or magnetic components. Contact MEIDI for detailed reliability data.
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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