SMLJ200E3/TR13

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TVS - Diodes refer to an important category of semiconductor devices designed to protect electronics from various unexpected overvoltage events. One popular device in this regard is the SMLJ200E3/TR13, a two-terminal unidirectional unipolar-type diode designed specifically for protecting high-speed data lines from electrostatic discharge (ESD) and electrical fast transients (EFT). This article examines the SMLJ200E3/TR13\'s typical applications and its underlying working principle.

Applications

The SMLJ200E3/TR13 is tailored for utilizing high pulse surge currents in various applications. Generally, any circuit that requires protection from surges above ITLP levels would benefit from deploying the device. It is particularly suited to provide protection to data lines in portable electronics, industrial and consumer electronics, automotive, and telecom systems.

Examples of areas in which the SMLJ200E3/TR13 is commonly used include I/O Port Protection, Telecom Line Protection, and Anti-ESD Protection. In I/O port protection, a single device is typically used to provide additional protection when the on-board protection fails due to current loading or waveform failure. In telecom line protection, the device has proven to be effective in preventing damage during lightning surges. It may also be employed to protect against data line transients and from radiated ESD.

Working Principle

The SMLJ200E3/TR13 is based on the proven market leading uni-directional, low-capacitance Supra-XTV™ diode process from Littelfuse. The diode is essentially a bidirectional assembly of two elements that act as an ESD suppression diode. When subjected to an voltage or electrostatic discharge outside of its normal operating range, the diode actively absorbs energy from the source. This limits the amount of energy transferred and hence eliminates the likelihood of damage to downstream components.

The diode provides a fast clamping response time with a clamping voltage of 6 to 8 V at 8 A. It also provides low capacitance (typically a few picofarads), allowing for protection of high-speed data lines such as I2C, HDMI, DVI, and more. In terms of EFT, the device can divert and clamp pulses in the 4/10 mV range, helping to protect the line from transients.

The SMLJ200E3/TR13 is extremely reliable and utilises a robust construction to deliver reliable performance in demanding environments. Its high surge capability ensures reliable protection in the event of lightning, while its low capacitance preserves signal integrity on high-speed data lines.

Conclusion

The SMLJ200E3/TR13 is a diode device designed for the specific purpose of protecting circuits from electrostatic discharge, electrical fast transients, and surge current protection. It is optimised for areas such as I/O port protection, telecom line protection, and anti-ESD protection. Its underlying working principle is based on a uni-directional, low-capacitance Supra-XTV™ diode process which efficiently dissipates energy and clamps voltages and transients. The device is extremely reliable and robustly constructed to deliver reliable performance in challenging environments.

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