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BM9040-0527-42 9.0*4.0 Mm High Quality Small Size High DB 3v Magnetic Buzzer From China With High Temperature

BM9040-0527-42 TAT Φ9.2×4.0mm 5V Passive Electromagnetic Pin Buzzer

BM9040-0527-42 is a compact passive electromagnetic buzzer developed by TAT. With ultra-thin dimension Φ9.2 × H4.0mm and pin through-hole design, this magnetic buzzer has NO built-in drive circuit. It requires an external 50% duty cycle square wave signal to produce clear stable audio alert tone. Adopted black PBT housing and reliable potting process, this small buzzer delivers consistent acoustic performance for mass electronic warning devices.

Model:
BM9040-0527-42
Brand:
TAT
Code:
BM9040-0527-42

Dimension:	D 9.2*H4.0
Resonant Frequency:	2731Hz
Rated Voltage:	5Vo-p
Operating Voltage:	3~7 Vo-p
Rated Current:	Max.80mA ,at 2.731KHz 50% duty Square Wave 5Vo-p
Sound Output:	Min. 80dB,at 2.731KHz 50% duty Square Wave 5Vo-p
Coil Resistance:	42±4Ω
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Product Description

Key Features

Passive electromagnetic type, without internal driving circuit
Rated Voltage: 5Vo-p, operating voltage range: 3~7Vo-p
Sound Output: Min.80dB @2731Hz, 5Vo-p, 50% duty square wave
Resonant Frequency: 2731Hz
Coil Resistance: 30±4Ω
Max Working Current: 80mA (tested under standard condition)
Housing Material: Black PBT, good insulation and heat resistance
Pin mounting design, easy soldering on PCB board
Compact thin size, saves PCB layout space
Operating Temperature: -20℃ ~ +70℃; Storage Temperature: -30℃ ~ +80℃
RoHS compliant for global export electronics projects

Technical Specification

Item	Parameter
Model No.	BM9040-0527-42
Dimension	Φ9.2 × H4.0 mm
Net Weight	Approx. 1.5g
Rated Voltage	5Vo-p
Operating Voltage	3~7Vo-p
Rated Current	Max.80mA, at 2731KHz 50% duty Square Wave 5Vo-p
Sound Output	Min.80dB, at 2731KHz 50% duty Square Wave 5Vo-p
Coil Resistance	30 ± 4Ω
Resonant Frequency	2731Hz
Operating Temperature	-20℃ ~ +70℃
Storage Temperature	-30℃ ~ +80℃
Pin Spec	L1=4.5±0.5mm, Φ=0.6±0.1mm
Housing Material	Black PBT
Mount Type	Pin / Through-hole
Circuit	Without circuit (Passive)

Application

This passive electromagnetic buzzer is widely used for audible reminder and warning signals:

1. Smoke detector & fire alarm

2. Security alarm & access control system

3. Household kitchen appliances

4. Smart home sensors

5. Electronic meters & measuring instruments

6. Industrial control indicator boards

7. Toy and portable electronic devices

Order & Custom Service

Free samples are available for performance testing
Stable production capacity with reliable lead time
Custom service: resonant frequency, pin length, packaging options
Datasheet, test report and RoHS certification can be sent on request

FAQ

Q: Is this an active or passive buzzer? A: This is a passive electromagnetic buzzer without built-in drive circuit. It cannot make sound directly by DC voltage, it needs square wave signal from MCU drive circuit.

Q: What driving signal does this buzzer need? A: Standard driving signal: 5Vo-p square wave, 50% duty cycle, resonant frequency 2731Hz for best loudness.

Q: What is the working temperature limit? A: Normal operating temperature range: -20℃ ~ +70℃, suitable for most indoor electronic equipment.