By Barry Brents, Littelfuse, Inc. Load-powered latching relay architecture enables battery-free HVAC control designs while reducing system complexity, size, and power consumption. Designing around power constraints, not features Despite advances in connectivity and embedded processing, one limitation continues to constrain smart thermostat design: power delivery. Many HVAC systems in the field still rely on two-wire […]
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Protect circuits to 50 or 30 kW with Littelfuse TVS diaodes
The SM15KPA-HR/HRA and SM30KPA-HR/HRA high-reliability TVS diode series from Littelfuse, Inc. are surface-mount transient voltage suppressor devices designed for lightning-induced surge protection in avionics, aviation electronics, defense systems and eVTOL platforms. Housed in an SPD4-1 package, the series provides 15 kW or 30 kW peak pulse dissipation (10/1000 μs), response time below 1 ps, 30 […]
Solid-state relay switches up to 900 mA
The CPC1343G OptoMOS® solid-state relay from Littelfuse is a normally open (1-Form-A) relay designed for high-reliability switching in industrial, medical and instrumentation systems. The device supports 900 mA continuous load current, 60 V blocking voltage and reinforced 5,000 VRMS input-to-output isolation, with fast switching times of 4 ms turn-on and 1 ms turn-off and a […]
Power MOSFET features low on resistance
Littelfuse, Inc. announced the release of the MMIX1T500N20X4 X4-Class Ultra-Junction Power MOSFET. This 200 V, 480 A N-channel MOSFET features an exceptionally low on-state resistance (RDS(on)) of just 1.99 mΩ, enabling superior conduction efficiency, simplified thermal management, and improved system reliability in power-dense designs. (View the video.) The MMIX1T500N20X4 utilizes a high-performance, ceramic-based, isolated SMPD-X package with […]
Automotive low-side gate driver features adjustable negative drive
Littelfuse, Inc. announced the release of the IX4352NEAU automotive-qualified low-side gate driver designed to meet the growing demands of SiC MOSFET and IGBT control in electric vehicle (EV) powertrain and DC-DC converter applications. (View the video.) The IX4352NEAU is the first AEC-Q100-qualified low-side gate driver to offer an integrated and adjustable negative gate drive bias, eliminating the […]
Reed relays: from voiceband calls to GHz ATE, now facing MEMS disruption part 3
Part 1 covered the basics, Part 2 explored the reed relay and its applications in ATE, while this final section examines MEMS-based relays and their role in ATE applications. Disruption: MEMS-based GHz relays The virtues and capabilities of the magnetically actuated reed relay are clear, so why change? It’s the usual story: technology moves on […]
2 kA power thyristor now available in DO-214AB (SMC) package
Littelfuse, Inc. announced the launch of the Pxxx0S3H SIDACtor Protection Thyristor Series, the industry’s first 2 kA surge protection component in a DO-214AB (SMC) package. This compact solution offers robust defense against severe transient events while enabling product miniaturization—ideal for next-generation power and energy designs. The Pxxx0S3H Series is purpose-built for AC and DC power lines in […]
TVS diodes use foldback technology to cut clamping voltage
Littelfuse, Inc. announced the launch of the 5.0SMDJ-FB TVS Diode Series, a 5000 W surface-mount solution in a DO-214AB package engineered to protect sensitive DC power lines from overvoltage transients. The new series incorporates foldback technology, which delivers up to 15% lower clamping voltage (VC) compared to traditional solutions, while maintaining Breakdown Voltage (VBR) above the Reverse Standoff […]
Solid-state relay switches power in video doorbells
Littelfuse, Inc. introduced the CPC2501M, a robust, self-actuating, normally closed solid-state relay optimized for chime bypass in video doorbell systems. Designed to replace discrete relay circuitry, the CPC2501M is the first application-specific integrated circuit (ASIC) in the Littelfuse portfolio for this function. It integrates self-protection, fault timing, and solid-state switching into a single compact 6×6 […]
Solid-state relays switch AC and DC loads
Littelfuse, Inc. announced the expanded offering to the industrial Solid-State Relays (SSRs) family of products. The additional three series of products and accessories are essential for heating applications that demand reliable and cost-effective switching and comply with international standards. View the video. The expanded SSRs are available in three configurations, plus added accessories: SRP1-CC – DC […]
