43000 series passive PFC low frequency laminated chokes
- Technology
- Low frequency laminated chokes
- Partner
- Myrra
Myrra’s 43000 series passive PFC chokes are low-frequency laminated-core inductors developed to improve power factor in mains-powered equipment. The series covers inductance values from approximately 1 mH up to 20 mH, giving designers flexibility for different power levels and harmonic filtering requirements. It is available in two standard core sizes, EI30 and EI38, and in two construction types: fully encapsulated or open-frame. This allows engineers to select either a sealed version for environmental protection and reduced noise or an open version for improved cooling and higher thermal endurance. Rated RMS currents range from about 5.2 A down to around 1.3 A depending on inductance and model family. Typical applications include LED drivers, industrial power supplies, adapters, appliances, and other AC/DC systems needing basic passive PFC. The chokes are designed for placement in the AC input stage to shape current draw and reduce harmonic distortion. Their passive approach avoids active control circuitry, making implementation simple and cost-effective for low to medium power designs. All models use safety-certified insulation systems and UL94 V-0 materials while also supporting RoHS and REACH compliance.
The 43000 series is designed for passive power factor correction in 50/60 Hz mains-powered equipment. These laminated chokes are installed in the AC input stage to help smooth current draw, reduce harmonic distortion, and support compliance with input current regulations such as EN 61000-3-2.
With both EI30 and EI38 core sizes and a choice of encapsulated or open-frame construction, the range gives engineers practical flexibility for thermal, mechanical, and environmental design needs.
Range features
A high level overview of what this range offers
- Passive PFC design – Improves input current waveform and power factor to help reduce harmonic distortion in mains-powered systems.
- Optimised for 50/60 Hz operation – Laminated low-frequency core design suits standard AC mains applications.
- Wide inductance range – Available from approximately 1 mH to 20 mH for different filtering and PFC requirements.
- Solid current capability – Rated RMS current range spans roughly 5.2 A to 1.3 A depending on the selected model.
- Two standard core sizes – Offered in EI30 and EI38 formats for easier mechanical integration.
- Encapsulated and open-frame variants – Choose potted models for protection and lower acoustic noise, or open versions for better cooling and higher thermal tolerance.
- High temperature resilience – Suitable for demanding environments, with open-frame versions supporting higher maximum operating temperatures.
- Safety-focused construction – Uses certified insulation systems and UL94 V-0 flame-retardant materials.
- Regulatory support – Helps simplify designs targeting RoHS, REACH, and harmonic current compliance requirements.
- Customisation available – Special inductance values or form factors can be developed for application-specific needs.
Downloads
for 43000 series passive PFC low frequency laminated chokes
What’s in this range?
All the variants in the range and a comparison of what they offer
| Specification | 43110–43121 (EI30 potted) | 43150–43161 (EI30 open) | 43210–43220 (EI38 potted) | 43250–43260 (EI38 open) |
|---|---|---|---|---|
Inductance (mH) | 1.0 – 20.0 | 1.0 – 20.0 | 1.0 – 15.0 | 1.0 – 15.0 |
Rated current (A_RMS) | 5.2 – 1.3 | 5.2 – 1.3 | 4.7 – 1.5 | 4.8 – 1.5 |
Saturation current (A_pk) | 10.4 – 2.1 | 10.4 – 2.1 | 10.5 – 2.5 | 10.5 – 2.5 |
Insulation class | Class B (130 °C) | Class F (155 °C) | Class B (130 °C) | Class F (155 °C) |
Core size & type | EI30 encapsulated | EI30 open-frame | EI38 encapsulated | EI38 open-frame |
FAQs
for 43000 series passive PFC low frequency laminated chokes
The 43000 series covers standard inductance values from about 1 mH up to 20 mH. Depending on the model, rated RMS current ranges from roughly 5.2 A for the lower-inductance versions down to around 1.3 A for the highest-inductance variants.
Encapsulated versions are sealed in flame-retardant resin for better protection against dust, moisture, and vibration, while also helping reduce acoustic noise. Open-frame versions use exposed windings and laminated cores, which support easier heat dissipation and higher thermal endurance for applications with tougher cooling conditions.
Yes. The series is described as RoHS and REACH compliant and uses UL94 V-0 materials for improved fire safety. It also incorporates safety-certified insulation systems to support reliable long-term use in mains-powered equipment.
Typical uses include LED lighting drivers, power supplies, adapters, household appliances, and industrial control equipment. They are commonly placed in the AC input stage to improve power factor and help reduce harmonic current distortion.
Saturation current indicates the approximate peak current at which the choke core begins to saturate and the inductance starts to drop significantly. This helps designers understand how the component behaves during startup, inrush events, or other peak-current conditions.
Passive PFC chokes are simpler and more cost-effective because they do not require active control electronics. They are well suited to many low-to-medium power applications, while active PFC circuits usually achieve higher power factor performance and are often preferred when tighter efficiency or regulatory targets must be met.
Yes. Custom passive PFC choke designs can be developed for applications needing different inductance values, core sizes, or mechanical formats beyond the standard 43000 series range.
EI30 and EI38 refer to the laminated core sizes used in the choke design. In the 43000 series, 431xx models use EI30 cores and 432xx models use EI38 cores, with the larger EI38 format generally taking up more space and offering greater magnetic volume.
