STC Inc.

McLeansboro, IL Doing business as Sun Tranformer Sun Transformer

UEI: N7W7EM9NLHD6
CAGE: 0BBP3
Primary NAICS: 334416 Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing
SAM.gov registration: Active through Jan 15, 2027

Company facts

Self-certified in SAM.gov: For Profit Organization

Manufacturer of Goods
Entity structure: Corporate Entity (Not Tax Exempt)
Other NAICS codes in SAM.gov: 334418 Printed Circuit Assembly (Electronic Assembly) Manufacturing
SAM.gov registration date: Oct 4, 1999
Physical address: 1201 W Randolph St, McLeansboro, IL 62859, USA
Website: suntransformer.com
Founded: 1986
Employees: 11-50
Estimated annual revenue: $1M-$10M
Industry: Information Technology

Semiconductors & Semiconductor Equipment

Semiconductors
SIC code: 36 Electronic & Other Electric Equipment
Profiles: LinkedIn

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Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated Jan 19, 2026.

Vendor	Location	Primary NAICS
The Sag Harbor Industries, Inc. UEI DQN6KVG8MN59	Sag Harbor, NY	334416 Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing
Magnetic Circuit Elements Inc. UEI NSR9YMFSKLR6	Salinas, CA	334419 Other Electronic Component Manufacturing
G B International Trading Co LIMITED UEI EZ5GLS5QYMG6	Endicott, NY	335311 Power, Distribution, and Specialty Transformer Manufacturing
"Leightner Electronics, Inc." UEI QNB3XYVF7LJ3	McKinney, TX	334416 Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing
Inductors, Inc. UEI T8XTRN38KN61	Anaheim, CA	423690 Other Electronic Parts and Equipment Merchant Wholesalers

From the vendor's SBA profile

Custom Electronic Transformers and Inductors

Printed circuit assemblies

General contract manufacturing

Yes. STC Inc.'s SAM.gov registration is active through January 15, 2027.

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