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You are here: Home / Buzzer / Passive SMD Magnetic Buzzer Series / KLJ-4020 Magnetic Buzzer

KLJ-4020 Magnetic Buzzer

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Passive SMD Magnetic Buzzer, used in mini type smart electronic devices.
  • KLJ-4020
  • KLJ-4020
  • 2500pcs/ carrier reel
  • 1.6kg
  • 330*330*30 MM
  • Yes


Specification of KLJ-4020 SMD Magnetic Buzzer


Technical Parameters KLJ-4020 SMD Magnetic Nuzzer

Oscillation Frequency(Hz)


Operating Voltage(Vp-p)


Rated Voltage(Vp-p)


Current Consumption(mA/max)

110 at Rated Voltage

Sound Pressure Level(dB/min)

73 at 10cm at Rated Voltage

Coil Resistance(Ω)


Operating Temperature(℃

-20~ +85

Storage Temperature(℃

-30 ~ +85

Environment Compulsory Standard


PS: Vp-p=1/2duty, square wave

Audible distance at rated vol.



Mini type smart electronic devices, such as wearable smart devices, artificial intelligence devices and more. 


Description of SMD magnetic buzzer:

1. LCP is applied as housing material with properties including heat resistance and acid-alkali resistance

2. Well-chosen yellow grass is applied as lead pin material in order to provide best welding property to the product.

3. Tiny size of the product adapts to more multiple PCB space design.It meets the trend of making electronic products ultimately small and thin.

4. Mature SMD design perfectly meets the SMT requirements which greatly improved welding efficiency.

5. Steadily effective distance of sound output is very suitable for a wide range of portable electronic devices

6. Rated square wave output and rated voltage are needed

7. ROHS Directive-compliant

Practical circuit of the buzzer_

Product Introduction and Application  


*Main Products: Integrated precision electroacoustic devices, including electronic buzzer, as a warning function for different electronic devices.

*Features: Small and thin, with exquisite workmanship and high production efficiency. We try to meet the trend of making electronic products ultimate small and thin.

*Applications: It can be widely used for cell phone accessories, tablet personal computer accessories, Bluetooth system devices, bank payment system, terminal device of Internet of things, wearable smart devices, GPS system, medical devices, etc


1. Our products meet the standard of ROHS,REACH,IOS:9001-2008,etc.

2. The item that sound pressure level value and Audible distance  is just for reference.It depends on your using environment. In general,smaller the buzzer is,shorter the valid hearing distance is.

3. Pin feet can be plated with gold or brass.

4. We can provide more detailed information if you need certain type's specification.For example,picture of structure of product.

5. We can offer solution and advice according to your operating requirement.Helping you choose the type you need.


包装图1包装图2tape and reel 1

Housing Materia

LCP plastic resin (Color : Black)


SMD Type






2.5k PCS / Carrier Reel

Inner Box


1 roll carrier reel



10 Inner Box

25k PCS Buzzers

Storage Life

6 months preservation at room temp(25±3Humidity 30%


ChangZhou Keliking Electronics Co., Ltd. is the full set solution supplier for micro SMT electroacoustics. We mainly deal with the designing, production and sales for micro SMT electroacoustic devices, we can offer the complete full set solution.

Registered Capital is RMB 10,000,000. Business Scope:  designing, producing and sales for electronics; Import & export for different types of commodity and technology. 

The turnover in 2015 is RMB 50,000,000. In 2016, we started to strengthen upstream and downstream production chain and enlarge our range. This will further increase the sales volume in the future.



Cooperating Company

Through seven years effort, we have established long term cooperation with Haier, OPPO, Lenovo, Philips, TCL, BYD, etc. famous brand.

Product quality, delivery time and service have received good reputation.


Further contact with us!

Quick link

Call us

Changzhou Keliking Electronics Co., Ltd.
Contact:Mr. Yao
Tel:86 +519-88671999-801
Fax:86 +519-88671999-808
Add:1-1301 Hang Seng Science Park, Tianning District, Changzhou, Jiangsu, China

Copyright  Changzhou Keliking Electronics Co., LTD. All rights reserved.