Toshiba Electronics Europe has expanded its range of automotive-grade surge-protection Zener diodes with the XCEZ series
Toshiba Electronics Europe has expanded its range of automotive-grade surge-protection Zener diodes with the introduction of the XCEZ series, a family of ultra-compact devices designed to safeguard vehicle electronics from electrical noise, switching surges, and electrostatic discharge (ESD)
Housed in a miniaturised SOD-523 package, the new diodes enable high-density mounting in today’s increasingly compact electronic control units (ECUs). Their small footprint — just 1.6mm x 0.8mm — represents a 59% reduction in mounting area compared with the SOD-323 package used for Toshiba’s previous XCUZ series. This makes the XCEZ family particularly well-suited for space-constrained automotive systems such as in-vehicle infotainment (IVI), advanced driver-assistance systems (ADAS), and battery management systems (BMS).
NOISE AND SURGE PROTECTION FOR THE ELECTRIFIED ERA
As vehicle electrification and connectivity advance, automotive ECUs are increasingly exposed to electrical noise and transient surges. These disturbances, ranging from nanosecond-scale ESD events to millisecond-scale switching surges, can induce malfunctions or even potentially permanent damage to sensitive circuitry.
The XCEZ series addresses these vulnerabilities by providing a robust suppression path for transient energy, diverting harmful surges away from vulnerable ICs and signal lines. This protection is essential for maintaining system stability and reliability, especially in applications handling high-speed communication or precision sensing.
ADVANCED PROCESSES FOR LOW DYNAMIC RESISTANCE
At the core of the XCEZ family lies Toshiba’s proprietary Zener diode process, optimised for low dynamic resistance (RDYN) – a key parameter determining how effectively a diode absorbs surge energy.
A lower dynamic resistance allows surge current to flow more easily through the diode, thereby clamping voltage spikes faster and more efficiently. For example, the XCEZ5V6 variant achieves a typical RDYN of only 0.16Ω, significantly reducing residual voltage during transient events and improving protection for downstream components.
This low resistance also enhances the diode’s capability to handle longer surge durations. The XCEZ devices can dissipate up to 6W (10ms pulse width), offering reliable protection against switching surges and near-DC overvoltages – conditions increasingly common in electrified powertrains and high-current control modules.
COMPREHENSIVE LINEUP AND AUTOMOTIVE-GRADE RELIABILITY
The XCEZ series comprises 20 part numbers, covering Zener voltages from 5.6V to 36V. This broad range allows designers to select optimal protection levels for major power supply lines and signal interfaces across diverse ECU architectures.
Every device in the lineup is fully AEC-Q101 qualified, ensuring compliance with stringent automotive reliability standards. This qualification confirms the diodes’ durability under thermal cycling, mechanical shock, and humidity conditions typical of the automotive environment.
ENABLING COMPACT RELIABLE AUTOMOTIVE ELECTRONICS
By combining high surge-absorption performance, miniaturised packaging, and automotive-grade reliability, Toshiba’s XCEZ series helps engineers design smaller, lighter, and more robust electronic systems.
For developers of next-generation ADAS, EV battery systems, and infotainment platforms, these new diodes simplify PCB layout, reduce footprint, and enhance resilience against the increasingly harsh electrical environment of modern vehicles.
As the automotive industry continues its transition toward electrified and software-defined architectures, components like the XCEZ series play a vital role in ensuring that the underlying electronics remain stable, noise-immune, and reliable, even under demanding operating conditions.
