EN
Custom EI PCB Transformers for Compact Power Supply Designs
Engineered with customized input voltage, output windings, rated power and pin layout for reliable integration into OEM circuit boards.
| Parameter | Typical Range / Available Options |
|---|---|
| Product Type | Open-frame, vacuum-impregnated or fully encapsulated PCB transformer |
| Rated Power | 0.5 VA to 30 VA typical; higher ratings subject to engineering review |
| Primary Voltage | 100V, 110V, 115V, 120V, 200V, 220V, 230V or 240V AC; single or dual primary |
| Secondary Voltage | 3V to 48V AC per winding typical; other voltages available |
| Output Configuration | Single, center-tapped, dual or multiple secondary windings |
| Frequency | 50Hz, 60Hz or 50/60Hz |
| Core Material | EI laminated electrical steel core selected according to power and temperature-rise requirements |
| Winding Material | Copper winding wire |
| Insulation Class | Class B 130°C or Class F 155°C |
| Dielectric Strength | Project-specific; 3.0–4.0kVAC primary-to-secondary options commonly available |
| Temperature Rise | Defined according to rated load, ambient temperature, enclosure and insulation class |
| Mounting Method | Through-hole PCB pins |
| Pin Configuration | Custom pin count, pitch, row spacing, diameter, length and polarity marking |
| Protection Options | Thermal fuse, resettable thermal protector or external PTC coordination |
| Shielding Options | Electrostatic shield, inter-winding shield or magnetic shielding where required |
| Operating Temperature | Typical design range from -20°C to +70°C, depending on the material system |
| Compliance Options | Construction designed for applicable IEC, EN or UL requirements; approval is model-specific |
- Overview
- Recommended Products
- Visual Inspection: Routine or sampling
- Dimensional Inspection: Sampling, with critical dimensions controlled as specified
- Winding Resistance: Routine test
- Turns Ratio / Output Voltage: 100% routine test
- No-Load Current: 100% or agreed inspection plan
- No-Load Loss: Sampling or qualification
- Load Voltage and Regulation: Sample and periodic verification
- Insulation Resistance: Routine or sampling
- Dielectric Strength / Hi-Pot: 100% at the approved test level
- Temperature Rise: Type or qualification test
- Audible Noise: When required by the approved specification
- Solderability: Qualification or sampling
- Resistance to Soldering Heat: Verified according to the project requirement
Custom PCB Transformers Engineered for Your Circuit Board
Compact through-hole PCB transformer with customized input voltage, output windings, rated power, pin layout and insulation construction. ECKO designs each transformer around your load requirements, PCB footprint, temperature-rise target and applicable safety requirements.
From initial electrical calculations to approved drawings, controlled production and routine electrical testing, we help OEM customers integrate reliable mains-frequency power conversion directly into their PCB assemblies.
Typical PCB Transformer Specifications
Specification notice: The values above represent typical engineering capabilities rather than one fixed catalog model. Final electrical ratings, dimensions, tolerances and test limits are defined by the customer-approved specification and dimensional drawing.
PCB Transformer Product Advantages
PCB Transformer Customization Options
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Electrical Input |
Electrical Output |
Rated Power |
PCB Footprint |
|
Product Dimensions |
Insulation System |
Dielectric Strength |
Thermal Protection |
|
Environmental Protection |
Noise Control |
Documentation |
Packaging |
Why Choose ECKO for Custom PCB Transformers?
PCB Transformer Tests and Reference Standards
From winding continuity and output voltage to insulation withstand, temperature rise and solderability, ECKO verifies each PCB transformer according to the approved drawing, test specification and inspection plan.
Routine Production Tests
|
Visual and Dimensional Inspection Workmanship, labels, polarity marks, pin condition, outline dimensions, seated height, pin pitch and pin position are checked against the approved drawing. |
Winding and Output Verification Winding resistance testing checks conductor continuity and manufacturing consistency. Turns-ratio and output-voltage testing confirm the required secondary voltage and winding polarity at the specified primary input. |
No-Load and Rated-Load Performance No-load current and no-load loss are evaluated to confirm core assembly, winding consistency and standby performance. Rated-load voltage and regulation are verified under defined input and load conditions. |
|
Insulation Safety Testing Insulation resistance testing checks electrical separation between windings and accessible conductive parts. Dielectric strength testing verifies the specified insulation withstand level at the approved voltage and duration. |
Temperature Rise and Audible Noise Temperature-rise testing verifies thermal performance under defined mounting, ambient and load conditions. Audible-noise evaluation is performed when transformer hum or mechanical vibration is controlled by the project specification. |
PCB Pin Solderability PCB pin wetting and resistance to soldering heat are evaluated to support stable PCB assembly and repeatable solder-joint quality. |
Custom PCB Transformer Development Process
PCB Transformer FAQ
1. What is a PCB transformer?
A PCB transformer is a compact, mains-frequency transformer designed for direct through-hole mounting on a printed circuit board. It converts the input voltage to one or more lower AC output voltages while providing the required electrical isolation between the primary and secondary circuits.
2. What information should I provide when requesting a custom PCB transformer?
Please provide the input voltage and frequency, each secondary voltage and current, load type, operating duty cycle, maximum dimensions, PCB footprint, ambient temperature, insulation requirements and estimated annual quantity. A PCB layout, dimensional drawing or existing transformer sample will help us evaluate the project more accurately.
3. How do I select the correct VA rating for a PCB transformer?
The basic VA requirement is calculated by multiplying each secondary voltage by its rated current and adding the results together. Additional design margin may be required for rectifier circuits, capacitive loads, peak currents, voltage-regulation requirements and elevated ambient temperatures.
4. Should I specify the secondary voltage at no load or full load?
For most custom projects, the required secondary voltage should be specified at the actual operating load. A transformer’s no-load voltage is normally higher than its rated-load voltage because of winding resistance and internal voltage drop. Please provide both values if your circuit has a strict voltage range.
5. Why is the measured no-load voltage higher than the rated output voltage?
The rated secondary voltage is usually defined at a specified load. When the transformer operates without a load, there is almost no voltage drop across the windings, so the measured output voltage increases. The difference between the no-load and full-load voltage is described as voltage regulation.
6. Can a PCB transformer be designed for a bridge rectifier and filter capacitor?
However, a rectifier-capacitor input draws short, high-current charging pulses rather than a smooth sinusoidal current. Please provide the required DC output voltage, DC load current, rectifier arrangement and filter capacitance so that the transformer can be sized correctly for winding heating and voltage regulation.
7. Can you manufacture PCB transformers with multiple secondary windings?
A PCB transformer can be designed with single, dual, center-tapped or multiple independent secondary windings. Each winding’s voltage, current, insulation relationship and connection method should be clearly defined in the approved electrical specification.
8. Can the secondary windings be connected in series or parallel?
Identical secondary windings may be designed for series or parallel connection. Series connection increases the available voltage, while parallel connection increases the available current. Correct winding polarity must be followed, and only windings specifically designed with matching characteristics should be connected in parallel.
9. Can you produce a PCB transformer with dual 115V/230V primary windings?
Two matched primary windings can be connected in parallel for approximately 115V operation or in series for approximately 230V operation. The required connection diagram, pin assignment and safety instructions will be defined on the approved drawing.
10. Can the same PCB transformer operate at both 50Hz and 60Hz?
Yes, if it is designed and rated for 50/60Hz operation. A transformer designed only for 60Hz may experience excessive magnetic flux, no-load current and heating if operated at 50Hz at the same voltage. The lowest intended operating frequency should therefore be stated before design approval.
