• 1201 West Randolph St., McLeansboro, IL, USA

STC, Inc. – Social Media


Illinois Office
1201 W. Randolph St.
McLeansboro, Illinois 62859

Les Vaughn – Design Engineer
(618) 643-2555

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STC Production Staff in IPC Certification Training
STC Production Staff in IPC Certification Training


AJA Europe - UKAS Logo

In addition to our industry quality certifications, STC, Incorporated is customer oriented, and employees throughout our company are dedicated to meeting both customer specifications and expectations. We make every effort to meet rapidly-changing delivery requirements. From avionics to medical instruments, from industrial controls to communications equipment, we take pride in our contribution to our customer’s products.

The electronic manufacturing services provided by STC are used in high-reliability applications, which require detailed source traceability. These industries include:

  • Aerospace / Aviation
  • Defense / Military
  • Renewable Energy
  • Smart Grid Technology
  • Broadcast Communications
  • Marine
  • Medical
  • Commercial & Industrial Electronics

The STC organization includes Production (Transformer and Electronics), Systems & Software Development, Engineering, Communications, Quality Assurance, Purchasing, and Administrative.

For more information about our production and service capabilities, please read the STC Capabilities Statement.


STC, Inc. is dedicated to adding value to the industries we serve by providing quality and reliable products to the marketplace. STC has developed, implemented, and maintained a quality management system to demonstrate its ability to consistently provide products that meet customer and applicable regulatory requirements, and to achieve customer satisfaction through effective application of this system.

Our goals are achieved by continual process improvements and effective preventive and corrective actions. As a part of our Electronic Manufacturing Services, the STC quality policy is to ship defect-free products in a timely manner to our customers. We strive to provide prompt and courteous service through a management team that is both involved with—and accountable to—our customers.


ITAR - International Traffic in Arms Regulations

STC Sun Transformer is an ITAR registered magnetics and electronics manufacturer dedicated to meeting or exceeding the requirements for military and defense technologies. STC Sun Transformer adheres to all ITAR requirements specified by the US State Department and fully complies with the Arms Export Control Act (AECA) and International Traffic in Arms Regulations (ITAR).


STC, Inc. is committed to sourcing materials and components from companies that share our values related to human rights, ethical behavior, and environmental responsibility. STC, Inc. supports the goal of ending violence, human-rights violations, and preserving the environment on a global basis.

As a part of these values, STC, Inc. does not directly purchase any Conflict Minerals from any source and does not knowingly procure any product containing conflict minerals from the conflict region.

In response to the Dodd-Frank Act of 2010, requiring certain companies to report the presence of conflict materials (tin, tungsten, tantalum, and gold) originating in the Democratic Republic of the Congo or an adjoining country, STC, Inc. has implemented a Conflict Mineral mitigation program that consists of:

  • Supplier purchase-order requirements to ensure that suppliers and component manufacturers do not knowingly purchase Conflict Minerals from the conflict region.
  • Existing supplier verification through collection of Conflict Mineral documentation, including Form SD.
  • Continuous supplier database updating (using the iPoint Conflict Minerals platform).

STC, Inc. strives to work cooperatively with our customers and suppliers in implementing conflict minerals compliance programs and awareness, and we may reconsider our willingness to source materials or components from suppliers who fail to support these goals.