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HQ: Salisbury, Maryland
1-888-286-7643
Toroid Corporation
Custom Design

Your dedicated engineering partner, from concept to production.

90% of what we ship is custom. Work directly with U.S.-based electrical engineers to design magnetics optimized for your specifications: electrical, mechanical, environmental, and regulatory.

40+
Years Designing Magnetics
72h
Typical First-Quote Turnaround
100%
US-Based Engineering
Active DesignT-CUS-9612
SchematicWindingThermal
Power
2000 VA
Efficiency
96.8%
Temp Rise
45°C
Weight
10.4 lb
Engineering Capabilities

Magnetic design is what we do.
It's not an adjacent service.

Our in-house team handles every phase: electrical design, materials selection, mechanical integration, compliance, and production engineering.

  • Electrical Design

    Full magnetic circuit modeling and winding optimization for your specific load profile, efficiency target, and regulation requirements.

    • Core selection & gap calculation
    • Winding topology & layering
    • Regulation & load-line analysis
    • Harmonic & surge handling
  • Mechanical Integration

    Mechanical design engineering to fit your enclosure, connectors, mounting, and service-access requirements, not the other way around.

    • Envelope & dimension constraints
    • Mounting patterns & hardware
    • Lead-wire termination & length
    • Encapsulation & vacuum impregnation
  • Regulatory Compliance

    Design-for-compliance is built in from the start, not retrofitted after prototyping. UL, CSA, CE, IEC, and medical standards.

    • UL 506, UL 5085, UL 60601
    • CSA C22.2, IEC 61558, EN 60601
    • RoHS & REACH compliance
    • FCC & EMC considerations
  • Thermal & Performance

    Thermal modeling, insulation system design, and accelerated life testing to ensure your transformer meets its service life.

    • Class B, F, H insulation systems
    • Temperature rise & hotspot analysis
    • Forced air & convective cooling
    • Surge & inrush characterization
  • Documentation & Traceability

    Engineering-grade documentation from day one: datasheets, spec sheets, test reports, and full production traceability.

    • Custom datasheets & 2D CAD
    • IQ/OQ/PQ validation docs
    • Build records & lot traceability
    • PPAP / PAI support
  • Prototype to Production

    From first-article proof-of-concept to 20,000-unit annual production, with the same team, the same quality standards, and the same accountability.

    • Rapid prototype builds (1 to 4 weeks)
    • First-article inspection & validation
    • Design for manufacturability review
    • Volume production ramp planning
Our Process

A straightforward path from your idea to a production-ready design.

01
DAY 1-3

Define Requirements

We start with a working call to capture electrical specs, environmental conditions, enclosure constraints, compliance targets, and volume expectations.

Deliverable

Signed spec document & NDA

02
DAY 4-15

Engineering Review

Core topology, winding design, material selection, and thermal modeling, delivered back to you as a packed design proposal with 2D geometry and expected performance.

Deliverable

Design proposal + 2D CAD + quote

03
DAY 16-25

Prototype & Validation

First-article build for in-house electrical and thermal testing. Design refinement based on your validation feedback.

Deliverable

Prototype units + full test report

04
ONGOING

Production & Delivery

Scale up to ISO 9001 production with full lot traceability. Dedicated production engineer for the life of your program. On-time delivery.

Deliverable

Ongoing production + QA reports

Before You Quote

The design conversation we love to have.

The more we know, the better we design. These are the considerations our engineers will walk through with you on your first call.

Quick Spec Checklist
  • Primary & secondary voltages (nominal + tolerance)
  • Continuous VA rating & duty cycle
  • Frequency (50 Hz / 60 Hz / 400 Hz)
  • Ambient temp & cooling method
  • Envelope / dimensional constraints
  • Mounting & termination type
  • Estimated annual volume
Key Design Considerations

What our engineers consider for every design.

  1. 01

    Electrical Performance Envelope

    Regulation, efficiency, inrush, and load behavior, optimized for your actual operating profile, not just nameplate ratings.

  2. 02

    Thermal Budget & Cooling Strategy

    Insulation class, temperature rise, and cooling method selected to meet your service life under real-world conditions.

  3. 03

    Safety & Compliance Architecture

    Creepage, clearance, and insulation coordination designed in, so your product passes certification the first time.

  4. 04

    Mechanical & Manufacturability

    Your transformer needs to fit, mount, terminate, and install cleanly. We design with your production team in mind.

  5. 05

    Supply Chain & Lifecycle

    Material availability, second-source planning, and obsolescence management so the design serves your product for years.

Engineering Project

Have a project? Let's design it together.

Quotes typically returned within 72 hours. NDA available on request. Your IP stays yours.