4 NEWS Issue 2 2025 Power Electronics Europe www.power-mag.com Efficient SiC MOSFET gate protection: Littelfuse's SMFA asymmetric TVS diodes – at Rutronik Ispringen, April 2025 – With the SMFA series of asymmetrical TVS diodes from Littelfuse, Rutronik is introducing an innovative solution for greater resilience of SiC MOSFET gate driver circuits. The diodes have been specifically designed to protect the sensitive gate structures from both negative and positive overvoltages and can therefore be used as a replacement for two separate TVS diodes. This enables designs that are both cost-effective and space-saving, while minimizing parasitic effects. They are particularly suitable for fastswitching SiC applications in the field of demanding power supply for AI / data centers, semiconductor / industrial equipment or e-mobility infrastructure. They are available in tape & reel standard packaging in various versions www.rutronik24.com. SiC MOSFETs typically have a significantly lower negative than positive gate voltage. Therefore, asymmetric protection with two separate TVS diodes was previously required, which took up more space in the design. To meet this challenge, Littelfuse offers the integrated asymmetric, bidirectional TVS diode Type SMFA. The components impress with low inductance and excellent clamping capability. They meet the requirements of IEC 61000-4-2 at 30 kV air and 30 kV contact discharge, as well as those of flammability class UL94 V-0. The whisker test is carried out based on JEDEC JESD201A in accordance with Table 4a of Classes 1 and 2. Depending on the required maximum gate voltage, various types with positive breakdown voltages (VBR) between 17.6 V and 23.4 V are offered. The negative breakdown voltage is 7.15 V in each case. Overview of benefits: • Asymmetrical diode for protection against both positive and negative overvoltage • Excellent clamping ability • Low inductance • Glass passivated junction chip • Surface mountable • Low profile SOD-123FL package with 1.08 mm height • Tape & reel standard packaging • Halogen-free and RoHS compliant Application examples: • Power supplies for AI/data centers or servers • Highly reliable power supplies for semiconductor/industrial equipment • High-efficiency power supplies for EVI (Electric Vehicle Infrastructure) For more information to SMFA series of asymmetrical TVS diodes from Littelfuse and a direct ordering option, please visit our e-commerce platform at www.rutronik24.com. Overview of available types and their characteristics (Copyright Littelfuse)
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