Littelfuse has launched the TPSMB Asymmetrical series of TVS diodes – TPSMB2412CA, TPSMB2616CA, TPSMB2818CA and TPSMB3018CA. These first-to-market devices are specifically designed for 12V battery anti-reverse protection, delivering superior performance compared to traditional symmetrical bi-directional TVS solutions.
The series is suited for a wide range of automotive applications that require 12V battery anti-reverse protection, including domain and zonal controllers, body control modules, infotainment and lighting systems, ECUs and power seats, motor pre-tensioner safety belts and various advanced driver assistance systems.
Unlike conventional approaches that often require multiple components, the TPSMB asymmetrical series provides a single-component solution that protects anti-reverse MOSFETs, diodes and DC/DC converter ICs from both positive and negative surges. The asymmetrical clamping capability ensures much lower clamping voltage from negative surges, enabling engineers to select lower-rated MOSFETs or diodes. This approach reduces conduction losses, simplifies design and lowers overall BOM costs.
The device offers asymmetrical protection with low positive clamping (24V-30V) and low negative clamping (12V-18V), replacing multiple Zener or TVS diodes to simplify PCB design. It delivers 600W peak pulse power, sub-1 ns response time and up to 30 kV ESD robustness. AEC-Q101 automotive qualification and a wide −65°C to 175°C junction temperature range ensure reliability, while the compact DO-214AA package helps optimize board space.
“The TPSMB Asymmetrical Series delivers the industry’s first single-component solution specifically engineered for 12V battery anti-reverse protection,” said Charlie Cai, director product marketing at Littelfuse.
“By enabling customers to use lower-voltage MOSFETs or diodes, these devices reduce conduction loss, simplify circuit design, and lower BOM cost while ensuring reliable automotive system protection.”
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