120uH 25A High-frequency Mn-Zn common mode choke for EMI noise above 30 MHz with low leakage inductance | Magnetic components | Transformer, Inductor, Choke Manufacturer | Coilmaster Electronics
This 120uH 25A common mode choke is engineered for power architectures where high current flow, thermal reliability, and predictable EMI suppression must be maintained simultaneously. With a 27.5 × 25 × 12 mm footprint, it targets next-generation power modules including fast-switching power stages, server power distribution units, and advanced industrial controllers. Its Mn-Zn ferrite core with a controlled air-gap ensures balanced magnetic behavior, allowing designers to maintain EMI compliance without compromising current capability or system efficiency.
To accommodate a 25A continuous current rating, this version uses a reduced inductance value, resulting in a lower overall impedance profile compared with higher-uH variants. Even with the lower Z characteristics, it delivers measurable broadband attenuation—approximately 20 dB at 2 MHz and 17 dB at 100 MHz—providing meaningful suppression for both switching-noise harmonics and high-frequency common-mode disturbances. The optimized ferrite geometry helps maintain inductance stability under temperature rise, reducing EMI drift and performance degradation during long-term high-load operation.
This choke integrates well into systems targeting CISPR 11, CISPR 32, EN 55032, and similar conducted-noise requirements. Its high-current rating and low-leakage design make it suitable for renewable-energy inverters, EV charging control boards, data-center power shelves, and high-frequency auxiliary converters used in telecom infrastructure. The through-hole package enhances mechanical durability in harsh environments, while the Mn-Zn air-gapped core provides consistent EMI behavior across diverse operating conditions, making it a dependable choice for designers building robust, compliance-ready power systems. Coilmaster Electronics is a high-current 120uH 25A High-frequency Mn-Zn common mode choke for EMI noise above 30 MHz with low leakage inductance, 120uH 25A Low-leakage, high-current common mode inductor optimized for upper-band EMI filtering above 30 MHz manufacturer from Taiwan since 1995. Coilmaster offers AEC-Q200 certified, high-efficiency power inductors, chokes, and transformers. Specializing in low-loss, high-current components for Automotive, 5G, and Industrial applications. Contact our experts for instant support. With more than 20 years of experience in magnetic territory, Coilmaster Electronics is specialized in the production of SMD power inductors, common mode choke, high frequency transformers.
120uH 25A High-frequency Mn-Zn common mode choke for EMI noise above 30 MHz with low leakage inductance
CMT2711-121-LF
120uH 25A Low-leakage, high-current common mode inductor optimized for upper-band EMI filtering above 30 MHz
This 120uH 25A common mode choke is engineered for power architectures where high current flow, thermal reliability, and predictable EMI suppression must be maintained simultaneously. With a 27.5 × 25 × 12 mm footprint, it targets next-generation power modules including fast-switching power stages, server power distribution units, and advanced industrial controllers. Its Mn-Zn ferrite core with a controlled air-gap ensures balanced magnetic behavior, allowing designers to maintain EMI compliance without compromising current capability or system efficiency.
To accommodate a 25A continuous current rating, this version uses a reduced inductance value, resulting in a lower overall impedance profile compared with higher-uH variants. Even with the lower Z characteristics, it delivers measurable broadband attenuation—approximately 20 dB at 2 MHz and 17 dB at 100 MHz—providing meaningful suppression for both switching-noise harmonics and high-frequency common-mode disturbances. The optimized ferrite geometry helps maintain inductance stability under temperature rise, reducing EMI drift and performance degradation during long-term high-load operation.
This choke integrates well into systems targeting CISPR 11, CISPR 32, EN 55032, and similar conducted-noise requirements. Its high-current rating and low-leakage design make it suitable for renewable-energy inverters, EV charging control boards, data-center power shelves, and high-frequency auxiliary converters used in telecom infrastructure. The through-hole package enhances mechanical durability in harsh environments, while the Mn-Zn air-gapped core provides consistent EMI behavior across diverse operating conditions, making it a dependable choice for designers building robust, compliance-ready power systems.
Customization
Due to the solid background of our engineer team at ferrite powder territory, we could modify the core powder, design and produce the most suitable product to fit customer's applications. Except for the standard characteristic of our series specification, Coilmaster Electronics also offer the customization product with low minimum order quantity (MOQ), tighter tolerance, different inductance and frequency applications.
Leadtime
Coilmaster’s standard lead time is 6~8 weeks, in urgent case, the fast delivery program is available. For specific product series, we could send out the goods within 10 or 20 working days.
Key features
- High-current capability
- Robust mechanical construction
- Consistent EMI performance under load
- Low-profile through-hole package
Applications
- Wideband EMI attenuation: ~20 dB @ 2 MHz and ~17 dB @ 100 MHz
- Thermally stable magnetic behavior under long-duration high load
- Balanced dual-winding structure for consistent common-mode suppression
- Mn-Zn ferrite core with controlled air-gap for stable high-current inductance
Construction
- Common Mode Choke
Size(mm)
- 27.5x25x12
Inductance(uH)
- 120
Inductance tolerance
- ±40%
Test Frequency(MHz)
- 0.1
Irms(A)
- 25
DCR(mΩ)
- 1.4
Additional Notes
Hi-Pot : 1500 (V)
Rated Voltage : 250 (V)
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120uH 25A High-frequency Mn-Zn common mode choke for EMI noise above 30 MHz with low leakage inductance | Magnetic components | Transformer, Inductor, Choke Manufacturer | Coilmaster Electronics
Located in Taiwan since 1995, Coilmaster Electronics Co., Ltd. has been a manufacturer of magnetic components. Its main magnetic components include, 120uH 25A High-frequency Mn-Zn common mode choke for EMI noise above 30 MHz with low leakage inductance, common mode chokes, SMD molding power chokes, chock coil inductors, SMD shielded and semi-shielded power inductors, low profile and high current power inductors, high voltage power inductors, ethernet and LAN power transformers, flat wire inductors, RJ45 jacks with integrated magnetics and high frequency transformers, and ceramic or air coil multilayer chip inductors.
Coilmaster offers AEC-Q200 certified, high-efficiency power inductors, chokes, and transformers. Specializing in low-loss, high-current components for Automotive, 5G, and Industrial applications. Contact our experts for instant support. With more than 20 years of experience in magnetic territory, Coilmaster Electronics is specialized in the production of SMD power inductors, common mode choke, high frequency transformers.
Coilmaster Electronics has been providing customers with high current power inductors since 1995, with both advanced technology and 29 years of experience, Coilmaster Electronics ensures that each customer's requirements are met.