onsemi NUP2105: High-Performance CAN Bus Protection Solution

In the complex ecosystem of modern automotive and industrial networks, the Controller Area Network (CAN bus) serves as the critical backbone for communication between electronic control units. Its reliability is paramount, yet it is consistently exposed to harsh electrical environments featuring destructive transient voltages from load-dump, electrostatic discharge (ESD), and other induced electrical noise. Protecting this vital data highway requires a robust and specialized solution. The onsemi NTP2105 is engineered to be that solution, offering superior protection and ensuring network integrity.

The NUP2105 is a bidirectional TVS diode array specifically designed for high-speed CAN bus interfaces. It is packaged in a compact SOT-23, making it ideal for space-constrained applications. This device is not a simple single diode; it is an integrated pair of steering diodes and a high-speed TVS diode, which work in concert to clamp overvoltage transients to a safe level, thereby shielding the sensitive CAN transceiver behind it.

What truly sets the NUP2105 apart is its exceptional performance characteristics tailored for high-data-rate communication. It features an ultra-low leakage current, minimizing power loss and ensuring no unnecessary drain on the system. Furthermore, it boasts an incredibly low capacitance of just 10 pF (typical). This is a crucial specification, as excessive capacitance can distort the high-speed CAN signal, leading to communication errors and data corruption. The NUP2105's low capacitance ensures signal integrity is preserved, maintaining clean and reliable data transmission.

The device is a cornerstone of robust ESD protection, effortlessly exceeding the stringent requirements of the IEC 61000-4-2 international standard (Level 4: ±30 kV air/contact discharge). It can also handle higher energy surges, such as those defined by ISO 7637-2, which simulates automotive transients. By implementing the NUP2105, designers can significantly enhance the electromagnetic compatibility (EMC) of their products, reducing susceptibility to interference and ensuring compliance with rigorous automotive and industrial regulations.

ICGOOODFIND: The onsemi NUP2105 stands out as an industry-leading, purpose-built protector for CAN bus systems. Its integrated design, combining ultra-low capacitance with superior clamping performance, provides a simple yet highly effective defense against a wide spectrum of electrical threats, ensuring maximum network reliability and longevity.

Keywords: CAN Bus Protection, TVS Diode Array, ESD Protection, Low Capacitance, Signal Integrity.