SMAJ75A-E3/5A Circuit Protection

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Often overlooked, Transient Voltage Suppressor (TVS) diodes are one of the most important components in any reliable circuit. The SMAJ75A-E3/5A device is a uni-directional series TVS diode sought for in a number of applications, where the device is expected to reduce overvoltage incidents and preserve transient waveforms.

Such an application field could include users who might require transient over-voltage protection for equipments used in a range of consumer, industrial, automotive and communication applications such as modems, electronic switches, wireless LAN, and PDAs.

To understand the working principle, first it is important to understand what a TVS diode is. A TVS diode can be thought of as a breakover diode operating in avalanche mode with a very high avalanche current. The uni-directional SMAJ series of TVS diodes is engineered such that both peak pulse current Ipp and peak pulse power Ppp are pre-specified with a goal to deliver high levels of over-voltage protection for a number of applications.

The SMAJ75A-E3/5A series has a pulse-power rating of 70W (5/1000 usec pulse width) with a peak pulse current of 270A and a fast response time. It has an uni-polar design and its RoHS compliant lead-frame is made of PPA-GF20, which gives the device a high level of protection against a range of environmental elements.

The TVS diode working principle is simple. The TVS diode sits across the load as a standby until a potentially damaging transient surge enters the system. The diode starts to conduct once the surge reaches the breakdown voltage or clamping voltage. Once it is conducting, it safely dissipates this energy to the ground, thus safeguarding the equipment.

The SMAJ75A-E3/5A device has a 7.5V stand-off voltage, which is the most common and widely specified voltage in this category. It has a very low capacitance of 5.0pF at 1.0MHz, which makes it ideal for signalling applications where high speed signals are concerned.

The SMAJ75A-E3/5A is an uni-directional ESD protected TVS diode, that will remain electrically stable in all temperatures while also securing incoming high-level voltage lines from electrical disturbances. It is widely sought for because of its fast response time and reliable protection ability.

In conclusion, the SMAJ75A-E3/5A series of TVS diodes are the perfect component for any application that requires transient over-voltage protection, due to their small size, fast response time and reliable protection ability. They prove to be a reliable, cost-effective and fast solution for applications of all kinds.

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