New Dimensions in Precision: Resi Unveils the SEWK6398 Ultra-Precise Current Sense Resistor Series

Resi is setting new benchmarks in current sensing: With the launch of the SEWK6398 series, the company introduces a shunt resistor that offers unparalleled stability and accuracy through the use of a specialised Kama alloy and innovative welding technology.

Maximum Stability via Kama Alloy

The core of the new SEWK6398 series is the Kama alloy (often referred to as Karma or 6J22). This nickel-chromium precision alloy is characterised by a resistivity two to three times higher than that of Manganin, alongside excellent oxidation resistance.

Utilising a precision resistance alloy developed in-house by Resi, the component achieves an extremely low temperature coefficient (TCR) of just ±10 ppm/K within the range of +20 °C to +80 °C. This ensures minimal resistance fluctuations even under varying thermal conditions.

Innovative Manufacturing: Electron Beam Welding without Trimming

A particular highlight is the production process. Following precision machining, the resistor is joined using an electron beam welding system developed independently by the Resi Group. This rigorous process control results in a target accuracy of up to ±0.5%—achieved entirely without the need for subsequent trimming.

Technical Specifications at a Glance

Designed for demanding environments, the SEWK6398 offers impressive performance data:

• Resistance Value: Currently available at 100 µOhm.
• Current Rating: Robust load capacity of up to 200 A.
• Inductance: Extremely low (≤ 2 nH), ideal for high-speed switching.
• Temperature Range: Fully operational from -55 °C to +170 °C.

Versatile Applications: From AI Servers to Medical Technology

The combination of high strength, low drift, and robustness makes this series ideal for a wide range of high-end applications. These include, in particular:

• E-Mobility: Efficient battery management in electric vehicles (EVs).
• Infrastructure: High-precision power supplies and energy storage systems.
• High-Tech: AI servers, semiconductor test equipment, and lithium-ion monitoring.
• Medical Technology: Applications requiring maximum reliability under extreme conditions.

With the SEWK6398 series, Resi provides a future-proof solution for engineers who refuse to compromise between performance and precision in current measurement.

You can obtain samples, quotations, information on short-notice delivery options and further details via the contact form or by contacting your usual point of contact.