Based on the quality of Japanese manufacturing, We will contribute to industrial growth and social implementation in Thailand and abroad.

JOHNAN SIAM CORPORATION LIMITED provides EMS services for electronic components and devices, and board repair services for equipment, etc. in Sriracha Pinthong 1 Industrial Estate, Chonburi Province. We provide highly reliable services with a focus on QCD.

Obtained IATF16949 certification and Green Industry (Level 3) certification


Electronics Manufacturing Service

Electronics Manufacturing Service

We provide EMS (Electronic Manufacturing Service) services for consumer electronics, White goods, car models, and industrial equipment.

Inspection and Pre-Assembly Services

Inspection and Pre-Assembly Services

We provide high-resolution inspection services (dimensional and visual) for electronic and automotive components.

Repair and rework of equipment, boards, etc.
Repair and rework of equipment, boards, etc.

After analyzing and identifying the causes of malfunctions and failures of devices and equipment that do not have specifications and schematics, we can repair or replace parts and put them back into use.

Do you have problem with these kinds of troubles?


Electronics Manufacturing Service
Poor quality


Inspection and Pre-Assembly Services
Lack of necessary equipment


Repair and rework of equipment, boards, etc.
Ack of manufacturing know-how

We will help you to solve with them.

Electronics Manufacturing Service


JOHNAN SIAM CORPORATION LIMITED, a group company of JOHNAN CORPORATION, contributes to solving various problems in manufacturing based on the Japanese manufacturing quality cultivated for many years.








We have added a page introducing JOHNAN SIAM with a video.

You can now apply for a simple quote from our homepage.

Bronze Award in "Thailand 5S Award 2023" sponsored by Thai-Japan Association for the Promotion of Economy, Trade and Technology.

A video about SIAM’s company profile is now available on our website.

Finalists for "Thailand 5S Award 2023" sponsored by Thai-Japan Association for the Promotion of Economy and Technology.

The top page of our website has been updated.