JOHNAN SIAM｜Japanese-Quality EMS in Thailand｜SMT, PCB Assembly, Inspection, Board Repair, IATF16949

We provide an integrated production system from board mounting of electronic components and devices to product assembly and quality inspection. We provide Japanese quality manufacturing services. (IATF16949 certified).

SERVICES contact

We have production equipment for L size PCBs in all processes. We can flexibly build a production line to suit your needs.

We supports a wide range PCBA is available from 0402(mm) chip to large odd parts.
We have installed 3D AOI inspection machines are set in SMT line to provide high-quality manufacturing.

SERVICES contact

About Us

JOHNAN SIAM CORPORATION LIMITED

JOHNAN SIAM CORPORATION LIMITED is an EMS company providing electronics contract manufacturing in Sriracha, Thailand. Since its founding in 2008, it has produced PCBA at volume for products such as televisions, air conditioners and motors, handling everything from SMT mounting to inspection and board repair at a single site. Serving high-mix low-volume to mass production for automotive, audio and industrial equipment, it joined the JOHNAN CORPORATION group in 2019 and holds IATF16949 certification.

SERVICES

Electronics Manufacturing Service

We provide EMS (Electronic Manufacturing Service) services for a diverse range of products including consumer electronics, white goods, automotive components, and industrial equipment. Our services encompass high-mix, low-volume to mass production capabilities.

Inspection and Pre-Assembly Services

We provide high-resolution inspection services, both dimensional and visual, for electronic components and automotive components, ensuring stringent quality control throughout the manufacturing process.

Repair and rework of equipment, boards, etc.

Our team performs thorough analysis to identify the causes of malfunctions and failures in devices and equipment. Even without original specifications or schematics, we adeptly repair or replace parts, restoring functionality.

Based on the consistent quality of Japanese manufacturing, JOHNAN SIAM CORPORATION LIMITED is dedicated to contributing to industrial growth and efficient implementation in Thailand and beyond.

We provide reliable EMS services for electronic components, devices, and board repair from our facility in Sriracha Pinthong 1 Industrial Estate, Chonburi Province, focusing on Quality, Cost, and Delivery (QCD).

We are certified with IATF16949 and Green Industry (Level 3) certifications, demonstrating our commitment to international quality standards and environmental responsibility.

Are you encountering these common manufacturing challenges in Thailand?

WE PROVIDE SOLUTIONS

Poor quality control or inconsistent product output?

Struggling with a lack of necessary manufacturing equipment or advanced technology?

Facing challenges due to a lack of specialized manufacturing know-how or experienced personnel?

NEWS ＆ EVENTS

Case Study Published: Material Quantity Set-up for Poka-Yoke in the Assembly Process

August 17, 2026

Japanese-quality manufacturing, made in Thailand. One-stop EMS from assembly to repair.

A JOHNAN CORPORATION group company. SMT, PCB assembly, inspection and board repair completed at one site. IATF16949 certified; high-mix low-volume to mass production for automotive, audio and industrial equipment.

We have production equipment for L size PCBs in all processes. We can flexibly build a production line to suit your needs.

We have production equipment for L size PCBs in all processes. We can flexibly build a production line to suit your needs.

We are engaged in 5S activities and
other workplace improvement activities.

We are engaged in 5S activities and other workplace improvement activities.

About Us

JOHNAN SIAM CORPORATION LIMITED

SERVICES

Electronics Manufacturing Service

Inspection and Pre-Assembly Services

Repair and rework of equipment, boards, etc.

Based on the consistent quality of Japanese manufacturing, JOHNAN SIAM CORPORATION LIMITED is dedicated to contributing to industrial growth and efficient implementation in Thailand and beyond.

We are certified with IATF16949 and Green Industry (Level 3) certifications, demonstrating our commitment to international quality standards and environmental responsibility.

Are you encountering these common manufacturing challenges in Thailand?

Poor quality control or inconsistent product output?

Struggling with a lack of necessary manufacturing equipment or advanced technology?

Facing challenges due to a lack of specialized manufacturing know-how or experienced personnel?

NEWS ＆ EVENTS

Case Study Published: Material Quantity Set-up for Poka-Yoke in the Assembly Process

Case Study Published: Automating Soldering in the Touch-up Process

Announcement of an Article on ‘System scan packing control’

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