What makes Bosan’s parts have loud level of sound, with plain plastic magnet?

Back in 1990s when its affiliated company – Yulrim Magnet – was supplying magnets to buzzer manufacturer in Korea, Structure of buzzers at that time was not understandable for us, because it was complicated and inefficient. Yulrim Magnet suggested  customers to replace 3-4 parts into one unibody magnet to save those customer’s cost and time but all those attempts were ignored. And this is the beginning of Bosanhitech’s history.

Korean buzzer manufacturers in middle of 1990s were adopting buzzer’s structure led by Japanese competitors. And all the Japanese companies used isotropic Neodymium magnet to drive their buzzers. This Isotropic Neodymium magnet are superior in magnetic force per unit volume. But are not suitable in making complex structure. This was the point we have focused and developed an unibody based buzzer with Anisotropic Ferrite magnet.

external link : the difference between the isotropic magnet and anisotropic magnet


materialIsotropic NeodymiumAnisotropic Ferrite
forming processbondedInjection molded
material costhigh, frustratingLow, stable
magnet flux per unit volume7,200 Gauss2,390 Gauss
complexity of designhardeasy
magnetic material volume used in a buzzer25 mm3150 mm3

As can be understood by above link and table, if the body of a buzzer is made of anisotropic Ferrite magnet, total magnetic force obtainable is higher by appr 2 times comparing to a buzzer that has isotropic Neodymium magnet inside.

A magnetic buzzer has more chance of having louder sound level, if it has stronger magnetic force inside. All of the magnetic buzzers Bosanhitech make have adopted this material / structure in order to obtain high level of sound and stable level of component cost to comfort customers.(In 2017, the Chinese industry one-sidedly increased the price of neodymium magnet or halted its production, which was a massive blow to the industry, while Bosan Hitech was untouched and came out unaffected)

We will keep this technological improvement to be customer’s satisfaction all the time.


Introducing BSMT-1140T series-bg

Introducing BSMT-1140T sequence,
The Most versatile SMD magnetic transducer within the trade.

From the institution in 1997, our aim has all the time been making SMD magnetic transducers as a serious product within the buzzer trade the place THT sort had been dominating.
After listening to buyer all around the world’s suggestions and getting by in-depth analysis, we lastly developed new SMD magnetic transducer – BSMT-1140T sequence – with high versatility defined on this doc.
Please discover out why this half is totally different from others, and speak to us or go to our sales space.


Lowest priced SMD buzzer available on the market

Price Comparability of Buzzers

Within the case of different digital part trade, many purchasers have switched from THT to SMD, as price in utilizing each was on the identical stage. Nonetheless, it was not the case within the buzzer trade but, so there had all the time been a excessive demand for extra inexpensive SMD buzzers from prospects.

This was a kind of issues that we’ve targeted. We deliberate to make half with good efficiency and reliability, on the identical price evaluating to THT sort. To do that, we needed to construct our manufacturing course of from backside to high, to chop out labor price which is kind of costly in Korea.

Although there nonetheless is worth distinction as seen in above chart, we anticipate that there will probably be no worries in switching from THT to SMD buzzer sooner or later contemplating the mounting price, productiveness, and failure ratio.


Advantage2 –
Patented easy construction which brings excessive reliability

A proof of Structural distinction in opposition to different makers’ buzzer

How does this distinction convey reliability?

A. Easier half, fixed high quality.
As proven in above comparability, Bosan half’s most important physique is uni-body made from magnet, whereas different components within the trade is consisted with 2~Three subparts which requires bonding/welding.
This easy construction guarantees an vital inner think about producing sound to be in excessive quantity. This additionally guarantees that there will probably be much less inner deformation on account of excessive temperature.

B. Much less components, much less processes
Since smaller variety of components are required to construct Bosan’s half, it’s a lot simpler to develop automated machines with excessive effectivity. Bosan has succeeded in creating these 10 years in the past due to the easy construction, and the machines has received extra correct annually since then.

C. Un-manned coil winding
Not like buzzers from different producer on this trade, Bosan buzzer’s easy construction permits its coil to be instantly wound and soldered within half with full auto machine. With effectively designed machine administration system, all of the coils are wound and soldered with machine accuracy so this half has much less likelihood of getting defected after pick-n-place and reflow course of.


Advantage3 – Swiftness and agility

Drawback – what is occurring within the trade

We obtain inquiry from many purchasers all around the world complaining about former provider’s irresponsible supply. We see this downside arising from the tradition of the Chinese language trade, the place most suppliers choose doing manufacturing and distribution on the identical time.
In different phrases, most of accidents occur as a result of these suppliers ahead product from its competitor.

We had been in the identical scenario in addition to these producers years in the past. Investing services/equipments for numerous sorts of product was not optimistic in most of circumstances. So we needed to import from Chinese language producers and resell to prospects.

Resolution we’ve carried out

As time goes by nevertheless, we discovered that it was important to have a manufacturing system which may meet agility and reliability on the identical time within the period of commercial booming. So we studied a manufacturing line which may produce from a hatchback to a sedan in a single place, and the implementation was profitable ultimately.

As of 2017 this method is prepared for SMD magnetic transducer, which is the main product of Bosanhitech. The primary product from this method is BSMT-1140T sequence which we are going to introduce by this doc and the World Supply commerce present. And after amassing buyer’s requirement by the present and all of the communication, we plan to introduce 2 extra product from 2018.


Product particulars
BSMT-1140T sequence

-. how you can learn half quantity

 Half quantity BSMT-1140T-3024 BSMT-1140T-5024BSMT-1140T-1420
dimension11.Zero x 11.Zero x 4.Zero mm
 rated voltage (Vo-p) 3.0 5.012.0
 working voltage (Vo-p) 1.5 ~ 4.53 ~ 7 9.0 ~ 15.0
 rated frequency (Hz) 2,4002,400 2,000
 DC resistance (Ω) 20±350±5 140±14
 min. SPL at 10 cm (dBA) 8890 90
 lead materials   Tin plated Brass
 housing materials  LCP




Dear all customers,

We will be attending to NEPCON JAPAN in the Electronic Components & Materials Expo from Jan. 18th(Wed) ~ 20th(Fri), 2017.

Exhibition will be held in Tokyo Big Sight, Japan.

We cordially invite you to visit us.
Our booth number is W12-27.
You may click on the below link for specific details and to register for a free ticket.
With Compliments
Bosan Hitech Co., Ltd