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Coils(HKTDC Electronic Components & Parts, Vol 01,2006)

Highly Tuned


Winmax Electronic Co Ltd makes coils in assorted sizes, all of which comply with international safety standards such as TUV, UL and CSA


Hong Kong has decades of experience producing inductors and transformers of all types. Among that broad spectrum, coils form a very important segment.

Today, Hong Kong's vast experience in coils is supported by imported, advanced production machinery that ensures the highest quality product. Similarly, raw materials are selected carefully, with most brought in from suppliers in Taiwan and Japan.

Subscribing to these standards is 1990-established SNM Int'l Ltd, a specialist in high frequency transformers, communications transformers, power inductors, choke coils, EMI components and SMD magnetic components.

"The main uses for our products are in computers and lighting fixtures," says manager Jason Ho. "We export them globally, although our more regular orders are from Europe."

With a total monthly production volume for coils in excess of one million pieces, the company also offers current transformers, pulse transformers, switching power transformers, SMD inductors and transformers, high frequency choke coils and line filters.

"Typically, our high-current SMD inductors are compact in size and have ratings of up to 50A. They have a low profile for easy machine placement, and are minimized electromagnetic types."

Raw materials such as copper wire, ferrite cores and bobbins come from Japan and Taiwan. "Material prices continue to rise," says Ho. "Fortunately, business remains steady and we can cope."

The firm operates an ISO 9001-certified, 200-worker, 4,000-square-metre factory in Shenzhen on the Chinese mainland. The minimum order is 1,000 pieces, while delivery times are presently 6-8 weeks due to labour shortages.

"Happily, with more than 10 years' experience in engineering, quality control, purchasing and production, we are well able to provide high quality products and assure all clients of our full attention at all times," Ho asserts.

Another company, 1995-established Ease House Ltd, manufactures SMD and EMI transformers, line transformers and ferrite cores. "These are our main products, but we also offer a wide range of inductors, coils and transformers," says general manager Sam Law.

With its independent design and development capability, Ease House can create and manufacture products to customers' specifications and in accordance with quality standards such as ISO 9002, UL, TUV, CE, CSA and CCEE.

"We export mainly to Asia, and business is steady despite the severe competition," says Law. "We buy a lot of raw materials from mainland-based suppliers, and that helps us keep prices in line with market demand."

Production takes place at a 3,200-square-metre plant in Shenzhen that boasts more than 300 employees. Delivery time is 10-15 days to markets such as Hong Kong, the mainland, Singapore, Canada, the US, Pakistan and Korea.

"We will continue to import modern technology and equipment and to improve the competitiveness of our products," Law promises. "We will also share the benefits with our customers as we continue to expand and develop."

Also offering custom-made, premium quality transformers for major electronics manufacturers is 1991-established Mainstar Industries Ltd.

The company's range of products includes ferrite transformers, toroidal chokes and coils, EMI line filters and audio/voice transformers, usually sold under the Mainstar brand name. The monthly production capacity for coils reaches as high as two million units.

"We import raw materials from across Asia and that tends to balance price increases," says assistant sales manager Karen Huang. "We also stay loyal to our suppliers, and in turn they make sure materials are always ready and available for our production needs."

Major markets include Hong Kong, the US, Taiwan, the UK, Germany, France and Austria. Delivery time is 30-120 days depending on the availability of materials, and production takes place at a 60,000-square-foot, 300-worker factory in Guangdong Province.

"In terms of quality, our engineering team has more than 20 years' experience. We promise excellent quality and competitive prices," says Huang. "We cordially invite clients to submit product specifications for our evaluation."

Another successful manufacturer of transformers, coils and inductors is Fenfa Electronics Ltd. The firm has moved its production facility from Shenzhen and is now manufacturing at an ISO 9001-, ISO 14001-certified factory in Dongguan.

"We have also moved with the times," says sales manager Kevin Ho, "and now manufacture power inductors, coils and transformers for use in digital cameras, DVDs, PDAs, MP3 players, portable DVDs and VGA cards."

The company sources cores and wires mostly from Taiwan (80%), Japan and the mainland and processes them at an 800-worker, 8,000-square-metre facility. Minimum orders of 2,000 pieces are ready for delivery in 7-10 days, and are usually shipped to firms on the mainland and in Taiwan who resell to Europe, particularly Germany, and to the US.

"Our philosophy of continual improvement is designed to promote future growth in line with customer satisfaction," says Ho.

This shows that Hong Kong is very well-placed to meet all kinds of orders for quality coils.


Ease House Ltd
Rm 1101, Leader Ind Centre
57-59 Au Pui Wan St
Fo Tan, New Territories
Hong Kong
Tel: 852-2947-7355
Fax: 852-2947-7356
Web: www.easehouse.com.hk

Fenfa Electronics Ltd
Rm 621, Shing Yip Ind Bldg
19-21 Shing Yip St
Kwun Tong, Kowloon
Hong Kong
Tel: 852-2372-0880
Fax: 852-2372-0131
Web: www.coilsfenfa.com

Mainstar Industries Ltd
13/F, Blk A, Hop Ming Fty Bldg
6-10 On Yip St
Chai Wan
Hong Kong
Tel: 852-2558-9319
Fax: 852-2557-6936
Web: www.mainstar.hk

SNM Int'l Ltd
Flat 4, 3/F, Wah Yiu Ind Centre
30-32 Au Pui Wan St
Sha Tin, New Territories
Hong Kong
Tel: 852-2690-3176
Fax: 852-2687-6396
Web: www.snm.com.hk

Super Power Co Ltd
Rm 47, 8/F, Blk F, Phase 2
Wah Lok Ind Centre
37-41 Shan Mei St
Fo Tan, New Territories
Hong Kong
Tel: 852-2601-3743
Fax: 852-2601-9442
Web: www.spc8.com

Techcon Electrical Ltd
Unit 312, Century Centre
44 Hung To Rd
Kwun Tong, Kowloon
Hong Kong
Tel: 852-2389-6247
Fax: 852-2343-9103

Winmax Electronic Co Ltd
Unit 12, 8/F, Trans Asia Centre
18 Kin Hong St
Kwai Chung, New Territories
Hong Kong
Tel: 852-2423-3698
Fax: 852-2423-0885
Web: www.winmaxhk.com