TDK Launches Vibration-Resistant Hybrid Polymer Electrolytic Capacitors
The new vibration-resistant capacitors use four base-plate posts to withstand mechanical accelerations up to 30 g, providing stable performance in demanding automotive and industrial applications.
TDK Corporation has introduced a vibration-resistant variant to its B409x series of surface-mount hybrid polymer aluminum electrolytic capacitors. While the standard SMD capacitors in TDK’s series offer vibration resistance up to 5 g, the company’s new design has been verified to withstand accelerations up to 30 g. The capacitors achieve this level of mechanical stability through the integration of four stabilizing posts that extend from the component’s base plate. These posts secure the capacitor can against mechanical shocks and high-frequency vibrations, meeting the requirements of MIL-STD-202, Method 204.
The vibration-resistant versions are identified by the part number suffix 100, distinguishing them from the standard suffix 000 types. This structural enhancement addresses the specific failure modes associated with board-level stress in heavy-duty automotive and industrial systems, where continuous mechanical resonance or sudden impact can lead to terminal fatigue or component detachment.
TDK has added vibration-resistant variants to its B409x series of SMD hybrid polymer aluminum electrolytic capacitors. Image used courtesy of TDK Corporation
Hybrid Electrolyte Performance and Electrical Characteristics
TDK’s B409x series capacitors utilize a hybrid electrolyte technology that combines a solid conductive polymer with a liquid electrolyte. This construction offers several electrical advantages over traditional liquid electrolytic capacitors, most notably a lower equivalent series resistance (ESR). The series features ESR values ranging from 10 mΩ to 33 mΩ, which remain relatively stable across the operating temperature range.
The capacitors are available with voltage ratings of 25 V to 80 V and capacitance values of 56 µF to 1100 µF. Due to their low ESR, these components support high ripple current capabilities, ranging from 2.8 A to 5.8 A. Thermal performance varies by sub-series: the B40950 industrial series is rated for an operating temperature range of -55°C to 105°C, while the B40910 series supports temperatures up to 150°C.
Reliability and Design Integration
In terms of service life, the hybrid polymer construction provides high reliability. The components offer a useful life exceeding 4000 hours when operated at 125°C at the rated voltage and maximum ripple current. For the B40950 industrial-grade variants, the useful life extends to 10,000 hours at 105°C.
Physically, the capacitors maintain a uniform 10 mm diameter, with heights ranging from 10.2 mm to 16.8 mm depending on the specific capacitance and voltage rating. These SMD components are RoHS-compatible and designed for compatibility with standard lead-free reflow soldering processes. By offering a high-vibration option with a standard footprint, the series enables drop-in upgrades in existing layouts where mechanical stress has been identified as a reliability concern.
TDK’s new capacitors can withstand vibrations up to 30 g in automotive and industrial electronics, including robotics. Image used courtesy of Adobe Stock
Advancing Automotive and Industrial Electronics
The combination of high vibration resistance, low ESR, and high-temperature capability makes the B409x series suitable for power conversion and filtering tasks in high-stress environments. In the automotive sector, TDK has designed its capacitors for use in power steering systems, DC-DC converters, cooling fans, and electric pump controllers for oil or water. Industrial applications include robotics, power tools, e-mobility solutions such as e-bikes and e-scooters, and high-performance GPUs. These components provide the necessary mechanical robustness to maintain electrical stability in systems exposed to constant motion or harsh operating cycles.
