Aluminum electrolytic capacitors
September 4, 2025
TDK unveils ultra-compact, vibration-resistant axial capacitors for up to +140 °C in automotive applications
TDK Corporation (TSE:6762) unveils the B41699 and B41799 series of ultra-compact aluminum electrolytic capacitors with axial-lead and soldering star designs, engineered to withstand operating temperatures of up to +140 °C. Tailored for demanding automotive applications, these components offer a high-capacitance and high-ripple current solution in a space-saving format. This enables designers to reduce the number of capacitors required in powertrain modules, such as electric power steering (EPS), fan control, and transmission systems.
The new capacitors are available for rated voltages of 25 V and 35 V, with capacitance values ranging from 1800 µF to 13,000 µF. They offer ripple currents of up to 34.6 A (IAC,max) at 10 kHz and +125 °C case temperature, supported by low ESR, over 4000 h of useful life (at +125 °C at rated voltage and rated ripple current), and vibration stability up to 60 g (optional). This robustness is particularly advantageous in xEV platforms operating within a 12-V board net, where thermal stress, mechanical vibration, and compact integration are critical design factors.
The axial-lead version (B41699) and the soldering star version (B41799) provide flexible mounting options for horizontal, vertical, or busbar configurations. The dimensions vary from 16 x 25 mm and 21 x 49 mm (D x H). Their SIKOREL-based construction allows for a storage life of up to 15 years at +35 °C, while ensuring RoHS compatibility and compliance with AEC-Q200 standards. By achieving high capacitance in a minimized footprint, these capacitors empower engineers to simplify their designs without compromising performance.
Further information on the products can be found at www.tdk-electronics.tdk.com/en/alu_axial
Features & Applications
Main applications
- Automotive electronics
Main features and benefits
Ultra compact design
High ripple current capability
Useful life 4000 h at up to +125 °C
Vibration stability up to 60 g available upon request
Low ESR at high frequency
SIKOREL design – storage for up to 15 years at a temperature of up to +35 °C
Compliance with AEC-Q200
RoHS-compatible
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.