Surge protection
December 2, 2025
TDK presents new S series inrush current limiters for up to 35 A and 750 J in high-power applications
![Bild_Teaser_grau_en]({"ratio4x3":{"210":"/resource/image/3657948/ratio4x3/210/158/c2ca0ffc13a1da266912a836b3c8234d/770667C9EA2285F0EBD93ED8B1D1B0E2/bild-teaser-grau-en.png","992":"/resource/image/3657948/ratio4x3/992/744/c2ca0ffc13a1da266912a836b3c8234d/5F1E9CBA6C440E04414950668BF58875/bild-teaser-grau-en.png","333":"/resource/image/3657948/ratio4x3/333/250/c2ca0ffc13a1da266912a836b3c8234d/2F2ABD0C1A27E10BF443B5D031A51BE9/bild-teaser-grau-en.png","445":"/resource/image/3657948/ratio4x3/445/334/c2ca0ffc13a1da266912a836b3c8234d/1206C9DF1FB3594438B5EC8D3114F0B2/bild-teaser-grau-en.png","290":"/resource/image/3657948/ratio4x3/290/218/c2ca0ffc13a1da266912a836b3c8234d/0B73A7C6A202C058EEB5F0D288B8EEE7/bild-teaser-grau-en.png"}})
TDK Corporation (TSE:6762) introduces the new S series inrush current limiters (ICLs), comprising the S30 (ordering code: B57130S0*M000) and S36 (B57136S0*M100) families of NTC thermistors. With maximum steady-state currents of up to 35 A and energy absorption capabilities of up to 750 J, the components are optimized for high-power applications that demand reliable suppression of inrush currents. Typical applications include switch-mode power supplies, frequency converters, photovoltaic inverters, uninterruptible power supplies, and soft-start motors.
The S30 series features disk diameters of 30 mm, 7.5 mm lead spacing, and maximum power handling of 19 W, while the larger S36 series (disk diameters 36 mm; lead spacing 19 mm) extends this capability to 25 W. Both variants are rated for a wide climatic category of 55/170/21 (IEC 60068-1). Depending on type, the components cover resistance values from 2 Ω to 20 Ω, permissible capacitances up to 13,050 µF at 240 V (AC), and continuous current ratings from 10 A to 35 A.
By offering stable performance with low power loss during continuous operation, the new S30 and S36 series enable designers to improve system efficiency to meet higher energy consumption standards. Users will benefit from a lower electricity bill over a conventional solution using fixed power resistors together with relays.
TDK offers a web-based NTC ICL selection tool that gives users recommendations for a suitable NTC ICL for their applications.
Features & Applications
Main applications
- Inrush current limiting, e.g., in
- Switch-mode power supplies
- Frequency converters
- Photovoltaic inverters
- Uninterruptible power supplies
- Soft-start motors
Main features and benefits
- Leaded and coated NTC thermistors
- Tinned copper wire
- Coating material flame retardant to UL 94 V-0
- Highly stable electrical characteristics
Key Data
Ordering code | Basis resistance at +25 °C | Maximum current | Maximum energy | Minimum resistance at |
|---|---|---|---|---|
| B57130S0*M000 | 2 … 15 | 12 … 25 | 200 … 300 | 0.027 … 0.114 |
| B57136S0*M100 | 2 … 20 | 10 … 35 | 500 … 750 | 0.020 … 0.190 |
![GENERAL_PressRelease_Download]({"ratio2x1":{"210":"/resource/image/3062604/ratio2x1/210/105/85250d089d433c1d582ad39c44888559/CB0A3BEC674759FD9B2B6A524AEC62D8/general-pressrelease-download.png","400":"/resource/image/3062604/ratio2x1/400/200/85250d089d433c1d582ad39c44888559/61E9D5ADB9EC869AE6966E9B55EF2CF5/general-pressrelease-download.png","510":"/resource/image/3062604/ratio2x1/510/255/85250d089d433c1d582ad39c44888559/1ED2D3C62E84049581F1D28FA4FEF580/general-pressrelease-download.png","600":"/resource/image/3062604/ratio2x1/600/300/85250d089d433c1d582ad39c44888559/46E6724CDA7ADA1E416018FE90536582/general-pressrelease-download.png","1200":"/resource/image/3062604/ratio2x1/1200/600/85250d089d433c1d582ad39c44888559/5FE72CA546D70DC43EDDF971B9E87827/general-pressrelease-download.png","290":"/resource/image/3062604/ratio2x1/290/145/85250d089d433c1d582ad39c44888559/E5A0E41AFCAA931C03124FD01522B8A4/general-pressrelease-download.png","350":"/resource/image/3062604/ratio2x1/350/175/85250d089d433c1d582ad39c44888559/C9E7FEBEDD0C3E7209CAE3DB0C8F987D/general-pressrelease-download.png"}})
About TDK Corporation
TDK Corporation (TSE:6762) is a global technology company and innovation leader in the electronics industry, based in Tokyo, Japan. With the tagline “In Everything, Better” TDK aims to realize a better future across all aspects of life, industry, and society. For over 90 years, TDK has shaped the world from within; from the pioneering ferrite cores to cassette tapes that defined an era, to powering the digital age with advanced components, sensors, and batteries, leading the way towards a more sustainable future. United by TDK Venture Spirit, a start-up mentality built on visions, courage and mutual trust, TDK’s passionate team members around the globe pursue better—for ourselves, customers, partners, and the world. Today, the state-of-the-art technologies of TDK are in everything, from industrial applications, energy systems, electric vehicles, to smartphones and gaming, at the core of modern life. TDK’s comprehensive, innovative-driven portfolio includes cutting-edge passive components, sensors and sensor systems, power supplies, lithium-ion and solid-state batteries, magnetic heads, AI and enterprise software solutions, and more—featuring numerous market-leading products. These are marketed under the product brands TDK, EPCOS, InvenSense, Micronas, Tronics, TDK-Lambda, TDK SensEI, and ATL. Positioning the AI ecosystem as a key strategic area, TDK leverages its global network across the automotive, information and communication technology, and industrial equipment sectors to expand its business in a wide range of fields. In fiscal 2025, TDK posted total sales of USD 14.4 billion and employed about 105,000 people worldwide.