Supporting higher power density and increased output in 48 V automotive systems, data centers, and AI server power supplies.
Market Drivers Behind the K Series
Transition to 48 V Automotive Architectures
The growing adoption of vehicle electrification
and advanced ADAS functions is driving demand
for high-capacitance, high-voltage components used
in motor-driven systems and central computer/Zone ECU architectures.
Demand for High Ripple Current Performance
High-power electronic systems require
capacitors with low ESR and high ripple current capability
to minimize heat generation and maintain stable operation.
Reduction of Board Space and Component Count
By replacing conventional hybrid capacitors,
designers can reduce component count, save PCB area,
and achieve more compact power supply designs.
Evolution of Data Center and AI Server Power Systems
As AI servers and high-performance GPUs continue
to increase in power consumption, adoption of 48 V/54 V bus architectures
is accelerating throughout next-generation server platforms.
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Note:Series names referenced in this document are extracted from product part numbers to indicate product categories and characteristics. They are not product names or trademarks.
Key Advantages of the K Series
High-Density Mounting with Proprietary φ12.5 mm Case Sizes
Available in proprietary φ12.5 × 13.5 mm and φ12.5 × 16.5 mm case sizes, the K Series combines high capacitance and high ripple current capability within limited board space, making it an ideal solution for power supply designs in GPU boards, server motherboards, automotive systems, and industrial equipment.
Industry-Leading Capacitance and Ripple Current Capability
With industry-leading capacitance and ripple current performance, the K Series offers up to 330 µF at 63 V and 180 µF at 80 V, while supporting ripple current ratings of up to the 6,000 mArms class at 125 °C.
By simultaneously delivering higher capacitance, higher ripple current capability, and higher voltage ratings, the K Series helps meet the increasing performance demands of next-generation power supply architectures.
Industry-Leading Capacitance and Ripple Current Capability J/K Series Product Lineup
□: Recommended for General Industrial (S) and Automotive (A) Markets
For detailed specifications, please visit TY-COMPAS or contact a TAIYO YUDEN representative.
*As of 7th July 2026.
Downsizing Opportunities Compared with Previous Generations (J Series and Earlier)
In representative applications, replacing conventional 125 °C hybrid capacitors with the K Series enables a smaller footprint while improving ESR and allowable ripple current performance.
Highlighted rows: K Series
Red text: Downsizing opportunities
| RV | P/N | Max.Temp [°C] |
Cap. [µF] |
ESR [mΩ] |
Ripple [mArms] |
Ripple Temp [°C] |
Size D [mm] |
Size L [mm] |
|---|---|---|---|---|---|---|---|---|
| 25V | RAHVK821M1TGL5005E | 125 | 820 | 15 | 4000 | 125 | 12.5 | 13.5 |
| RAHVK821M1TFK5002KX | 135 | 820 | 15 | 4800 | 125 | 10 | 12.5 | |
| RAHVK681M1TFK5002EX | 125 | 680 | 18 | 3000 | 125 | 10 | 12.5 | |
| RAHVK681M1TFH0002KX | 135 | 680 | 15 | 4600 | 125 | 10 | 10 | |
| RAHVK331M1TFH0002EX | 135 | 330 | 33 | 3900 | 125 | 10 | 10 | |
| RAHVX331M1TEH0002K | 135 | 330 | 33 | 3900 | 125 | 10 | 10 | |
| 35V | RAHVK561M1GGL5005E | 125 | 560 | 15 | 4000 | 125 | 12.5 | 13.5 |
| RAHVX561M1GFK5002KX | 135 | 560 | 15 | 4800 | 125 | 10 | 12.5 | |
| RAHVK391M1GFK5002EX | 125 | 390 | 18 | 3000 | 125 | 12.5 | 13.5 | |
| RAHVX391M1GFH0002KX | 135 | 390 | 15 | 4600 | 125 | 10 | 12.5 | |
| 63V | RAHVK101M4EFK5002EX | 125 | 100 | 26 | 2000 | 125 | 10 | 10 |
| RAHVX101M4EFH0002KX | 135 | 100 | 18 | 4000 | 125 | 10 | 12.5 | |
| RAHVK560M4EFH0002EX | 125 | 56 | 30 | 1400 | 125 | 10 | 10 | |
| RAHVK560M4EFH0002KX | 135 | 56 | 23 | 3300 | 125 | 8 | 10 | |
| 80V | RAHVK330M1RFH0002EX | 125 | 33 | 36 | 1200 | 125 | 10 | 10 |
| RAHVX330M1REH0002K | 135 | 33 | 25 | 3000 | 125 | 8 | 10 |
*For production status, detailed specifications, and warranty conditions, please contact a TAIYO YUDEN representative.
Recommended Applications
■Automotive Applications
・Designed for automotive systems transitioning to 48 V architectures driven by vehicle electrification and increasingly advanced ADAS functionality.
・TAIYO YUDEN's K Series lineup supports high-power automotive applications with industry-leading capacitance and ripple current capability.
■AI Server Applications
・Designed for 48 V/54 V power distribution lines used in AI servers that require high reliability under dynamic load conditions.
・With voltage ratings from 63 V to 80 V, the K Series supports input smoothing through excellent voltage withstand capability and ripple current performance, helping maintain stable system operation.
Contact Us
For detailed K Series specifications, part number selection support, AEC-Q200 qualification data, and custom product solutions, please contact us.