What Custom Magnetics does

Custom Magnetics, Inc. is a privately held, family-owned custom manufacturer of transformers and inductive components, founded in 1974 and headquartered in North Manchester, Indiana. The firm designs and builds engineered-to-order magnetics for OEM customers across audio, medical, industrial, aerospace, automotive, telecommunications, power utilities, and renewable energy end-markets. Operations are housed in a 40,000-square-foot U.S. facility with 51-100 employees, supplemented by a joint-venture manufacturing presence in Borada, India established in the 1990s. Certifications include ISO 9001:2015 for quality management, ITAR for defense article handling, and MBE status.

The product portfolio spans audio transformers, current and potential transformers, ignition coils, high-voltage transformers, R-Core transformers, chokes, and inductors. Core construction techniques include laminated EI and C-core silicon steel, toroidal and ferrite cores, and the proprietary R-Core design claimed to deliver leakage flux approximately one-tenth that of conventional configurations. Manufacturing capabilities cited include precision winding, epoxy encapsulation, vacuum impregnation, and computerized test equipment, with the 2002 acquisition of James Electronics extending reach into power supply and telecommunications applications.

The business model is direct OEM sales executed through a quote-based, project-driven RFQ process with no public pricing. Order sizes range from five-piece prototypes to production runs above 20,000 units, supporting a mixed-volume customer base rather than a single large anchor. Go-to-market is content-led through a technical blog and educational resources aimed at design engineers, with the Frenetic design-automation tool integrated to accelerate the RFQ-to-quote workflow. Revenue is generated from custom manufacturing contracts and turnkey assembly services; no revenue, contract value, or backlog figures are disclosed.

Name

Custom Magnetics

Legal name

Custom Magnetics, Inc.

Website

https://custommag.com

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

51–100 employees

Short description

Custom Magnetics, Inc. is an ISO 9001:2015 and ITAR-certified custom transformer and coil manufacturer founded in 1974, serving OEMs in audio, medical, aerospace, industrial, telecommunications, and renewable energy sectors with engineered-to-spec magnetics from prototypes to production runs.

Ownership category

akta.pro rank

Product category

Custom Transformers & Coils

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), All Other Electrical Equipment and Component Manufacturing (33599)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Transformers & Magnetics (Power/Signal) (HDAHANAD)

akta.pro secondary industries

Inductors & Coils (Power/RF/Chokes) (HDAHANAC), Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

Keywords

• Custom transformer manufacturing
• Electrical coils
• R-Core transformers
• Audio transformers
• Ignition coils

Headquarters

HQ city

North Manchester

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Custom Transformer Sales: Custom Magnetics generates revenue through the design and manufacture of custom-designed transformers and coils. Revenue is earned through project-based contracts where customers provide specifications and the company delivers custom-engineered magnetics. Orders range from small quantities (as low as 5 pieces) for prototypes to high-volume production runs of 20,000+ units.
2. Turnkey Assembly Services: The company offers turnkey assembly services where they procure all components and completely assemble finished products for customers, simplifying their manufacturing process.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Custom Magnetics, Inc. designs and manufactures custom transformers and coils for the electrical and electronics industries. The company produces laminated, toroidal, ferrite core, and R-Core transformers, as well as chokes, inductors, and ignition coils, engineered to customer specifications with order quantities ranging from 5-piece prototypes to 20,000+ production units.

Product overview

Custom Magnetics, Inc. is a manufacturer of custom-designed transformers and coils for the electrical and electronics industries. The company offers a comprehensive portfolio of transformer types including laminated, toroidal, ferrite core, and R-Core transformers, along with chokes and inductors. Their product families include Audio Transformers for sound equipment, Current and Potential Transformers for power measurement, Ignition Coils for engines, High-Voltage Transformers for industrial applications, and R-Core Transformers for noise-sensitive equipment. All products are custom-designed to customer specifications with engineering, prototyping, and manufacturing services.

Differentiator

Problem solved

Functional benefit

Products and services

• Audio Transformers

Quantifiable outcome

• Leakage flux approximately 1/10th that of conventional EI or UI transformers (R-Core design)
• +3 more outcomes

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered core and minor.

• James ElectronicscoreStrategic or Co-development Partner · 1 January 2002In 2002, Custom Magnetics acquired James Electronics, which had operated for over 50 years as a leading manufacturer of telecommunications transformers and power supplies. This acquisition strengthened Custom Magnetics' production capabilities and expanded their product portfolio in telecommunications applications.
• Joint Venture Partner - Borada, IndiaminorStrategic or Co-development Partner · 1 January 1990During the 1990s, Custom Magnetics developed higher-volume production capabilities through a joint venture partnership with a facility in Borada, India. This modern facility produces large-volume orders at low cost and exports large oil-filled distribution transformers up to 2000 KVA in size.

Scale indicators5 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Murata Power Solutions: Murata Power Solutions is a global manufacturer of DC-DC converters, AC-DC power supplies, and associated magnetics. Comparable as a magnetics supplier to industrial and telecom OEMs, but operates at much larger scale and through broader power electronics solutions.
• Standex Electronics (Standex-Meder): Standex Electronics designs and manufactures magnetics, sensors, and reed switches for industrial, medical, and automotive applications. Overlaps with Custom Magnetics in custom magnetics for industrial and medical OEMs, but operates as a diversified electronics components platform.
• Hammond Manufacturing: Hammond Manufacturing is a larger, publicly listed manufacturer of transformers, enclosures, and electronic hardware with global distribution. Comparable as a transformer supplier, but it is a broader portfolio player rather than a pure custom magnetics specialist.
• TDK (Lambda / TDK Electronics magnetics): TDK's magnetics and power electronics divisions produce inductors, transformers, and chokes serving automotive, industrial, and renewable energy customers. Comparable end-market exposure but at vastly larger scale and through global, integrated product lines.
• Vishay Intertechnology: Vishay is a global manufacturer of passive electronic components including inductors and transformers for industrial, automotive, and aerospace markets. Comparable magnetics product categories, particularly in military/aerospace qualification, but Vishay is far larger and broader.

Direct peers

• Prem Magnetics: Prem Magnetics is a custom transformer and coil manufacturer based in the US Midwest with a similar product breadth spanning power, audio, and industrial magnetics. Closely comparable in scale, custom-design focus, and OEM customer orientation.
• Signal Transformer: Signal Transformer manufactures standard and custom power transformers, inductors, and chokes for industrial and commercial customers. Comparable product mix and custom-engineering approach with broader distribution channels than Custom Magnetics.
• Coilcraft: Coilcraft is a leading US-based manufacturer of inductors, coils, and transformers with strong custom magnetics capabilities serving telecom, automotive, medical, and industrial markets. Directly comparable product categories and end markets, with a larger global footprint.
• Triad Magnetics: Triad Magnetics is a US-based custom and standard transformer and inductor manufacturer serving audio, industrial, medical, and power customers. It is the most direct comparable to Custom Magnetics given overlapping product portfolio (audio, power, chokes) and similar custom OEM sales motion.

Emerging players

• Butler Winding (and other US specialty magnetics shops): Smaller US specialty magnetics manufacturers serve custom and prototype transformer markets comparable to Custom Magnetics' 5-piece to production run model. They are direct competitors for short-run and specialty design work, though with narrower product breadth and certifications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Custom Magnetics