* Product Parameters Operating frequency:10kHz-500KHz Operating temperature:-40℃ to +125℃ Storage temperature:-25℃ to +85℃ Storage humidity:30 to 95%
* Features
The ER42 transformer is a medium-to-high power, high-frequency transformer. Its core features are mainly reflected in its unique cylindrical center column structure, excellent heat dissipation performance, and wide power adaptability.
* Typical application areas
The ER42 transformer is a medium-to-high power, high-frequency magnetic core. With its unique cylindrical center column and wide winding window, it is widely used in the industrial, communications, and new energy fields. * Product Standards UL, RoHS, 3C,CQC * Size Specifications 
Type | Structure
Tурe | Dimension（mm） | Pin Row （mm） | Row Pitch（mm） | OD Pin
（mm） | note | A | B | C | Pin | E | F | ER42-001 | Vertical | 42.5 | 30.0 | 47.0 | 7+7 | 5.00 | 25.00 | Φ1.0 |
| ER42-002 | Vertical | 42.5 | 38.0 | 47.0 | 7+7 | 5.00 | 30.00 | Φ1.0 |
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*The above are commonly used skeleton styles for the company.,Other styles are not included.,Inquiries are welcome. Our company can customize high-frequency transformers of various specifications according to customer requirements.
The ER42 transformer is categorized as a medium-to-high power, high-frequency transformer. Its core performance is primarily reflected in its power capacity, frequency characteristics, magnetic core structure, and electrical insulation. Below is a detailed analysis of its performance parameters and features:
Core Performance Parameters The performance parameters of ER42 transformers may vary slightly depending on the specific model (e.g., ER4215, ER4220) and the core material (e.g., PC40, PC44), but the general specifications are as follows:
Performance Indicator | Typical Parameter | Explanation | Rated Power | 240 VA - 380 VA | Approximately 240VA at 50kHz, and can reach 380VA at 100kHz, depending on the topology. | Operating Frequency | 40 kHz - 500 kHz | Suitable for high-frequency switching power supplies, commonly used in 50kHz-100kHz applications. | Core Material | PC40 / PC44 / PC95 | Ferrite cores with high saturation flux density (~0.3-0.5T) and low loss characteristics. | Core Structure | Cylindrical Center Post | The cylindrical center post provides a larger winding space and better heat dissipation, making it suitable for high-power applications. | Insulation Class | Class B / F / H | Commonly Class B (130掳C) or Class F (155掳C), offering good temperature resistance. | Withstand Voltage | 3 kV - 4 kV | AC voltage that can be withstood between primary and secondary windings, ensuring safe isolation. |
Structural Features and Advantages
Winding Advantage: The ER42 core's cylindrical center post design, compared to a square center post (e.g., EE type), facilitates easier winding and provides a larger effective winding cross-sectional area. This contributes to higher output power and improved heat dissipation efficiency.
Thermal Performance: The core's larger size (A=42mm) and favorable surface-area-to-volume ratio result in better control of temperature rise during high-frequency, high-power operation.
Application Scope: Widely used in medium-to-high power variable frequency drives, switching power supplies, energy storage inductors, and resonant converters.
Selection Considerations
Bobbin Compatibility: The ER42 is available with various bobbin specifications (e.g., vertical, horizontal, with pin pitches of 3.0mm/5.0mm). It is essential to select the appropriate bobbin model based on the PCB layout and pin spacing requirements.
Frequency and Losses: Although the ER42 supports high-frequency operation, design must balance core loss and copper loss to avoid reduced efficiency or overheating caused by excessively high frequencies.
The ER42 transformer is categorized as a medium-to-high power, high-frequency transformer. Its core characteristics are primarily reflected in its unique cylindrical center post structure, excellent thermal performance, and broad power adaptability.
Core Structural Characteristic: Cylindrical Center Post This is the most distinctive feature distinguishing the ER series cores from EE, EI, and other cores with square center posts, and it is also their fundamental advantage:
Larger Winding Space: The cross-sectional area of a cylindrical center post is typically larger than that of a square post of comparable size. This means that for the same core size, the ER42 can accommodate more copper wire (larger wire gauge or more turns), thereby supporting higher power output.
Winding Process Friendly: The smooth cylindrical surface has no sharp edges, reducing the risk of damage to the enamel insulation or stress concentration during both machine winding and manual winding. This is conducive to improving production efficiency and product consistency.
Low Leakage Inductance Design: The cylindrical coil structure helps minimize leakage inductance and distributed capacitance, giving the transformer better electrical performance during high-frequency operation.
Performance and Thermal Characteristics
High Power Density: Within the 42mm size category, the ER42 is a model with relatively high power density. At typical operating frequencies (e.g., 50kHz-100kHz), its output power range is generally between 240W and 380W, with some optimized designs capable of achieving even higher power.
Excellent Thermal Performance: The core's geometric shape provides a moderate surface-area-to-volume ratio. Furthermore, the air gap design between the center post and side posts facilitates air circulation, resulting in better heat dissipation compared to some enclosed core structures, which effectively controls temperature rise.
Good High-Frequency Characteristics: The ER42 typically utilizes high-permeability ferrite materials like PC40 or PC44, which feature low core loss. It is suitable for high-frequency environments ranging from 20kHz to 500kHz, enabling effective reduction in transformer size and weight.
Application and Selection Characteristics
Application Scenarios: Widely used in medium-to-high power variable frequency drives, industrial switching power supplies, telecommunication power supplies, UPS systems, and resonant converters.
Selection Considerations: The ER42 is available with various bobbin specifications (e.g., vertical, horizontal). The appropriate model should be selected based on PCB layout and pin spacing requirements. Additionally, its core usually requires the use of an air gap to adjust inductance values.
The ER42 transformer, a medium-to-high power, high-frequency magnetic core, is widely used in industrial, telecommunications, and new energy applications due to its unique cylindrical center post and spacious winding window.
Core Application Areas The ER42 transformer is primarily applied in medium-to-high power switching power supplies, industrial equipment, and communication systems, specifically including:
Industrial & Telecommunication Power Supplies: Such as high-power UPS systems, telecommunication base station power supplies, industrial variable frequency drives, and PC power supplies. For example, in ATX 3.0 standard 1200W PC power supplies, the ER42 is often used as the main transformer to support high-current output.
New Energy & Vehicle Systems: In PV energy storage inverters, on-board chargers, and servo drivers, the ER42 is employed to achieve high-frequency energy conversion. Its good thermal characteristics make it suitable for high-current operating environments.
Resonant & Forward Topologies: Particularly well-suited for LLC resonant converters and single-switch forward circuits. The cylindrical core facilitates the winding of resonant inductors with low leakage inductance, contributing to improved power supply efficiency.
Performance Support (Why It Suits These Scenarios) The ER42's advantages in these scenarios stem from its unique physical structure and electrical characteristics:
Strong Power Handling Capability: At typical operating frequencies (50kHz-100kHz), the ER42's output power can reach 280W to 350W. With high-frequency design or optimized cooling, the upper power limit can even exceed 500W, sufficient to meet the power demands of most industrial equipment.
Excellent High-Frequency Characteristics: It offers a wide operating frequency range (typically 40kHz-500kHz). When paired with high-permeability materials like PC40 or PC95, the core exhibits low loss, making it suitable for high-frequency switching power supply applications.
Thermal & Manufacturing Advantages: The cylindrical center post not only facilitates easier winding (reducing the risk of enamel wire damage) but also increases the winding's cross-sectional area, benefiting heat dissipation and enabling higher output power.
Typical Circuit Topologies In practical applications, the ER42 transformer typically appears in the following classic topologies:
LLC Resonant Half-Bridge Converter: Leveraging the ER42 core's ease of creating low-leakage resonant inductors, it is commonly used in telecommunication power supplies or high-power DC-DC modules.
Single-Switch Forward Circuit: In industrial power supply design, the ER42 is often used in forward topologies, working with a reset winding to achieve energy transfer.
Push-Pull or Full-Bridge Circuit: In high-power inverters or frequency converters, the ER42 can be used in push-pull structures to achieve high-power-density designs.
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