Littelfuse has added three high-voltage automotive TVS diode series for transient protection in electrified vehicle power systems. The TPSMC, TPSMD, and TP5.0SMDJ series extend the company’s TP Series portfolio with devices designed for battery disconnect units, high-voltage HVAC systems, PTC heaters, and DC power distribution circuits.
The TPSMC, TPSMD, and TP5.0SMDJ devices are automotive-grade transient voltage suppression diodes used to clamp voltage spikes in high-voltage power electronics. They sit across vulnerable rails or switching nodes to protect GaN and SiC MOSFETs, IGBTs, and surrounding circuitry from load dumps, inductive switching events, and other high-energy transients.
Higher Standoff Voltage For EV Power Protection
The series is aimed at designs where traditional lower-voltage TVS devices may need to be placed in series to reach the required protection level. Littelfuse is offering higher standoff voltages in a single surface-mount device, with ratings reaching up to 400 V and, across the broader series information provided, voltage options extending higher depending on the family. For engineers working on high-voltage automotive subsystems, that can reduce the number of protection devices needed on the board. It also simplifies layout around sensitive power devices, where available PCB area, creepage, routing, and thermal behavior already need careful attention.
Surge And Pulse Power Ratings Across The Series
The TPSMC series supports 1500 W peak pulse power, the TPSMD series supports 3000 W, and the TP5.0SMDJ series supports 5000 W. Peak surge current is specified up to 300 A, giving the family coverage for harsh transient conditions in automotive HV systems. The devices also have a typical response time of less than 1 ps. In use, the TVS diode clamps the transient before the protected semiconductor is forced beyond its safe operating area. That is especially relevant as wide-bandgap devices continue moving into higher-voltage automotive designs, where switching speed and transient energy both need to be managed.
Automotive Qualification And Surface-Mount Packaging
The devices are AEC-Q101 qualified and PPAP capable, supporting use in automotive electronics programs. Littelfuse also specifies IEC 61000-4-2 ESD compliance up to 30 kV for additional system-level protection. All three series use the DO-214AB SMC surface-mount package and are available in unidirectional and bidirectional configurations. That gives designers some flexibility depending on whether the protected node sees one-polarity or bidirectional transient stress.
Where The New TVS Diodes Fit
The target applications are mainly high-voltage automotive power blocks, including BDUs, HVAC compressors, PTC cabin heaters, battery heaters, and HV DC distribution. These are parts of the vehicle where switching events and fault conditions can expose power semiconductors to severe voltage spikes. Using a higher-voltage TVS device can also support selection of lower-rated GaN, SiC, or IGBT devices in some designs, provided the protection scheme is validated against the system’s actual transient profile. Littelfuse frames this as a way to reduce component count and BOM cost while maintaining robust protection in next-generation automotive power electronics. The TPSMC, TPSMD, and TP5.0SMDJ series are available in tape and reel format in quantities of 3,000, with samples available through authorized Littelfuse distributors.
Learn more and read the original announcement at www.littelfuse.com
Technology Overview
The Littelfuse TPSMC, TPSMD, and TP5.0SMDJ series are high-voltage automotive-grade TVS diodes for transient protection in EV power electronics. The devices support standoff voltages up to 400 V, peak pulse power ratings of 1500 W, 3000 W, and 5000 W depending on series, and peak surge current up to 300 A. They are supplied in DO-214AB SMC surface-mount packages and are AEC-Q101 qualified, PPAP capable, and IEC 61000-4-2 ESD compliant up to 30 kV.
Frequently Asked Questions
Where would these TVS diodes sit in an EV power system?
They are used across high-voltage rails or switching nodes to clamp transients in systems such as BDUs, HVAC compressors, PTC heaters, and HV DC distribution.
Which power devices are these Littelfuse TVS diodes designed to protect?
They are intended to protect GaN and SiC MOSFETs, IGBTs, and related high-voltage automotive power electronics from voltage transients.
What is the difference between TPSMC, TPSMD, and TP5.0SMDJ?
The main confirmed difference is peak pulse power rating: TPSMC supports 1500 W, TPSMD supports 3000 W, and TP5.0SMDJ supports 5000 W.
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