Welcome to the Triad Magnetics Technical FAQ Repository. As an ISO 9001:2015 certified manufacturer with over 75 years of electromagnetic engineering experience, Triad Magnetics provides global OEMs with authoritative answers to complex design, application frequency, PCB assembly, export compliance, and product warranty queries. Explore our detailed engineering insights below.

Electrical Specifications & Operational Frequencies

Can a standard 50/60Hz power transformer be operated at 400Hz?

Yes. Triad’s standard 50/60Hz power transformers can be safely operated at 400Hz.

Operating a transformer engineered for 50/60Hz line frequencies at a higher frequency (such as 400Hz common in aerospace, defense, and specialized industrial marine systems) will naturally reduce the magnetic core losses. This reduction in core loss becomes particularly advantageous in larger Volt-Ampere (VA) magnetic designs.

Design & Weight Trade-off Considerations: While operating a 50/60Hz transformer at 400Hz is electrically viable, the primary trade-off is component weight and physical footprint. A magnetic component custom-engineered specifically for 400Hz applications requires far fewer core laminations and copper turns for equivalent VA ratings—resulting in a significantly lighter, more compact profile than an off-the-shelf 50/60Hz unit.

Does Triad Magnetics provide SPICE models for circuit design and simulation?

A Simulation Program with Integrated Circuit Emphasis (SPICE) model relies on precise non-linear electrical values to simulate magnetic performance accurately. Key parameters include winding DC resistance, core loss factors, magnetic permeability, and inter-winding parasitic capacitance.

Because magnetic materials demonstrate highly non-linear behaviors across varying operational frequencies, ambient temperatures, and drive signal levels, generic SPICE models often produce inaccurate or misleading simulation results. To ensure optimal performance in your custom circuit design, Triad’s application engineering team directly supplies custom technical parameters tailored to your exact operating parameters.

Why is the measured no-load output voltage higher than the transformer nameplate rating?

The secondary output voltage rating of any power transformer is specified at its full rated load current. Two main variables explain higher open-circuit voltage readings:

  1. Passive Input/Output Linearity: Transformers are passive electromagnetic devices. Within linear core saturation limits, secondary output voltage varies proportionally with primary input voltage variations.
  2. Transformer Voltage Regulation: Under no-load conditions (such as measuring secondary leads with a high-impedance digital multimeter), secondary current draw is negligible. Secondary voltage rises above the nominal rated voltage due to the intrinsic internal winding resistance—a phenomenon defined as transformer regulation.

Engineering Rule of Thumb: In physically smaller transformers (under 10VA), the open-circuit (no-load) secondary voltage can exceed the nominal rated voltage by up to 30% to 50%. Larger power transformers exhibit tighter regulation with smaller no-load voltage variance.

PCB Assembly, Hand-Soldering & Board Washability

Are Triad transformers compatible with automated PCB washing processes?

Triad Magnetics manufactures PCB-mount transformers in two primary construction formats: open-construction varnish-impregnated units and fully potted epoxy-encapsulated units.

  • Solvent Resistance: The industrial-grade impregnation varnishes and epoxy compounds used by Triad demonstrate excellent resistance to standard PCB washing solvents, including isopropyl alcohol solutions. Avoid exposure to thinned benzene-derivative solvents (such as toluene or xylene) which can degrade organic varnish films over extended contact.
  • Aqueous Wash & Post-Bake Protocol: When utilizing aqueous cleaning systems (typically 10% to 70% Isopropyl Alcohol with deionized water), components must undergo a post-wash oven bake at a minimum of 60°C for at least 30 minutes. This thermal drying process ensures that trapped moisture inside open-bobbin assemblies fully evaporates, preventing internal core oxidation or insulation breakdown over time.

What is Triad’s recommended hand-soldering procedure for RoHS lead-free thru-hole components?

Since 2005, Triad Magnetics has manufactured 100% RoHS-compliant components with lead-free pin finishes. Lead-free solder alloys (such as SAC305) require precise thermal profiles compared to legacy Sn60/Pb40 solders due to higher liquidus melting points.

Tip Temperature 600°F (315°C)
Dwell / Touch Time 3 to 4 Seconds
Tip Width Ratio 2/3 of Pad Width
Solder Wire Diameter Equal to Pin Dia.

Optimal Process Guidelines:

  • Iron Temperature: Set soldering iron tips to 600°F (315°C). Lower temperatures (e.g., 500°F) fail to achieve proper liquidus state, resulting in cold joints and zero through-hole pin wetting. Excessive temperatures (e.g., 650°F+) cause flux burnout and disturbed solder joints during prolonged cooling.
  • Thermal Contact: Maintain simultaneous tip contact against both the PCB copper pad and terminal pin for 3 to 4 seconds to allow proper capillary flow across both top and bottom sides of double-sided boards.

Part Numbering, Packaging & Regulatory Compliance

What does the "-B" suffix designate on Triad Magnetics part numbers?

The "-B" suffix on Triad part numbers designates bulk industrial packaging designed for automated OEM assembly lines. Bulk packaging options utilize specialized anti-static plastic trays, IC shipping tubes, segmented cardboard dividers, or tape-and-reel formats in place of individual boxed packaging—reducing unpacking labor and packaging waste during high-volume production runs.

What are Triad’s CAGE Code and ECCN export classification numbers?

For defense contractors, aerospace buyers, and international trade compliance officers, Triad Magnetics maintains active government registrations:

  • CAGE Code: 3FRZ0 (Registered corporate name: Acumen Electronics Inc. dba Triad Magnetics).
  • ECCN Number: EAR99. Standard Triad magnetics and power supplies fall under EAR99 control, subject to standard U.S. Department of Commerce Export Administration Regulations.

Do Triad WSU external power supplies meet U.S. DOE Level VI efficiency standards?

Yes. Triad’s WSU Series of external wall plug-in power supplies complies fully with the U.S. Department of Energy (DOE) Level VI efficiency mandates under Docket EERE-2008-BT-STD-0005-0219.

Level VI compliant models feature production date codes of 1605 (YYWW) or later and display the official circular Roman numeral VI icon on the product rating label as required by federal energy regulations for direct-operation power supplies.

What warranty coverage does Triad Magnetics guarantee for catalog products?

Triad Magnetics backs its industrial component manufacturing quality with comprehensive long-term warranty protection for global original equipment manufacturers:

  • 5-Year Limited Warranty: Covers all standard catalog switch-mode power supplies, regulated DC power units, and WSU series wall plug-in adapters from purchase date.
  • 10-Year Limited Warranty: Covers all standard catalog power transformers, audio transformers, current sense transformers, inductors, chokes, and custom magnetic coils from purchase date.

Products are guaranteed free from defects in material and workmanship and engineered to satisfy published technical parameters under normal industrial operational limits.

Have Custom Magnetics Requirements or Further Technical Questions?

Our California-based engineering team works directly with global OEM buyers and electrical engineers to resolve custom transformer specifications, thermal designs, and prototyping demands.

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