TPSMB Asymmetrical TVS Diodes Cut Conduction Loss and BOM Cost in 12V Battery Systems

Innovative design enables the use of lower-rated MOSFETs or diodes while ensuring reliable protection.

ROSEMONT, Ill. December 23, 2025 — Littelfuse, Inc. (NASDAQ: LFUS), an industrial technology manufacturing company empowering a sustainable, connected, and safer world, today announced the launch of the TPSMB Asymmetrical Series TVS Diodes (TPSMB2412, TPSMB2616, TPSMB2818, TPSMB3018). 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.

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, allowing engineers to select lower-rated MOSFETs or diodes. This approach reduces conduction losses, simplifies design, and lowers overall BOM costs.

Key Features and Benefits

• Asymmetrical protection with low positive clamping (24–30 V) and low negative clamping (12–18 V).
• Single device replaces multiple Zeners/TVS diodes, streamlining PCB design.
• High performance: 600 W peak pulse power, <1 ns response time, and up to 30 kV ESD dissipation.
• Automotive qualified: AEC-Q101 compliant with a wide -65°C to 175°C junction temperature range.
• Compact design: DO-214AA surface-mount package optimizes board space.

Applications
The TPSMB Asymmetrical Series is ideal for a broad range of automotive applications requiring 12V battery anti-reverse protection, including:

• Domain and zonal controllers
• Body control modules (BCMs)
• Infotainment and lighting systems
• ECUs and power seats
• Motor pre-tensioner safety belts
• ADAS systems

“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.”
With the launch of the TPSMB Asymmetrical Series, Littelfuse expands its automotive protection portfolio to address the evolving requirements of 12V battery systems in modern vehicles.

 FAQs: TPSMB Asymmetrical Series TVS Diodes

What makes the TPSMB Asymmetrical Series different from traditional TVS diodes?
The TPSMB Asymmetrical Series utilizes asymmetrical clamping, resulting in significantly lower clamping voltage during negative surges. This approach enables designers to use lower-rated MOSFETs or diodes, thereby reducing conduction losses and BOM costs compared to symmetrical bi-directional TVS solutions.

Which applications are best suited for these devices?
These TVS diodes are designed specifically for automotive 12 V battery anti-reverse protection. Typical uses include domain/zonal controllers, ECUs, infotainment systems, lighting modules, power seats, ADAS, and motor pre-tensioner safety belts.

How does this product simplify circuit design?
The TPSMB Asymmetrical Series replaces multiple Zener or TVS diodes with a single device. This streamlines PCB layouts, saves board space, and enhances system reliability while ensuring fast, high-power surge protection.

Are the TPSMB Asymmetrical Series TVS diodes automotive qualified?
Yes. The devices are AEC-Q101 qualified and designed to meet automotive surge and ESD requirements, including ISO 7637-2 pulses. This ensures they deliver reliable protection in demanding 12 V battery system environments.

Availability

The TPSMB Asymmetric TVS Diode Series is available in tape and reel format in quantities of 3,000. Sample requests are accepted through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.

For More Information
Additional information is available on the TPSMB Asymmetric Series product page. For technical questions, please contact: Charlie Cai, Director of Product Management, Protection Business, SBU, CCai@littelfuse.com