MXSMLJ45AE3 Circuit Protection

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TVS – Diodes: MXSMLJ45AE3 application field and working principle

Transient Voltage Suppressors (TVS) are diode-based voltage protection devices employed to protect sensitive electrical and electronic components against transient voltage spikes. In contrast to other surge protective devices, TVS diodes can provide protection against both normal mode, resulting from unidirectional power surges, as well as common mode, which arises from line noise and imbalance in the power source. As the name implies, TVS diodes absorb and dissipate sudden unwanted voltage peaks to safeguard the connected load from destruction or malfunction.

One TVS diode type is the MXSMLJ45AE3. It is a low capacitance unidirectional TVS diode in an SOD-323F surface mount package with a low breakdown voltage of 4.5 V. The device has a maximum clamping voltage of 6.7 V and a maximum reverse leakage of 20 μA @ 7.3 V. It can withstand a maximum surge current of 18 A (8 x 20 μs) and has an operating temperature range of -55 °C to +150 °C.

The MXSMLJ45AE3 has a wide variety of applications, including protection of USB 2.0, USB 3.1, other data lines, and other equipment from transient voltage surges. It can also be used to protect automotive systems from blackouts, brownouts, and load dumps. It is suitable for use in military systems, industrial, consumer, or any other application where protection from transient voltage is required.

The working principle of the MXSMLJ45AE3 is based off of the Zener breakdown principle. When a voltage above the diode\'s breakdown voltage is applied across its terminals, the circuit experiences a Zener breakdown caused by the electric field inside the diode exceeding the breakdown electric field threshold of the depletion region. This sudden collapse of the depletion region forces current through the diode at its Zener voltage, clamping the voltage at the breakdown voltage and thereby providing protection to the connected load.

In conclusion, the MXSMLJ45AE3 is a unidirectional TVS diode in an SOD-323F surface mount package with an efficient and reliable breakdown voltage of 4.5 V. It is capable of withstanding large transient voltage spikes and is suitable for a variety of applications, such as USB 2.0, USB 3.1, automotive systems, and industrial or consumer equipment. Its working principle is based on the Zener breakdown principle, wherein the electric field inside the diode exceeds the breakdown electric field threshold of the depletion region, clamping the voltage at the breakdown voltage and protecting the connected load.

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