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Automobile safety has always been one of the key concerns of automotive electronics engineers. As we all know, the working environment of automobiles is extremely harsh. Electronic control units, infotainment systems, sensors, and other automotive electronic devices are connected to one power cord. The power sources of electronic equipment products are motors and batteries. Because the engine and battery are easily affected by other conditions such as temperature and operating conditions, they fluctuate. Also, automotive systems that use solenoid loads such as fuel injection systems, valves, motors, and electrical and hydrolysis controllers introduce ESD, spike noise, and other types of transient and surge voltages onto power and signal lines.
To this end, a major challenge in automotive design is: how to protect automotive electronics from high surge voltages, transient voltages, ESD, and noise on the power line. The birth of SM8S series transient suppression TVS diodes has become an ideal protection component for automotive electronic equipment. Next, Dongwo Electronics, a professional high-quality protection device manufacturer, will mainly introduce the primary and secondary protection applications of the TVS tube SM8S series in automotive power lines.
TVS tube SM8S series, how much do you know?
SM8S series TVS diode is the leading product of Dongwo Electronics, which complies with the AEC-Q101 certification standard, and can pass the ISO 7637-2 5a/5b and ISO 16750 load dump test requirements. It has high reliability and high stability and is widely used in automobiles. Business recognition and favor. SM8S26A/SM8S26CA, SM8S28A/SM8S28CA, SM8S30A/SM8S30CA, SM8S33A/SM8S33CA, SM8S36A/SM8S36CA, SM8S40A/SM8S40CA, SM8S43A/SM8S43CA. At the same time, we provide free selection, testing, and sample services. It is clear at a glance whether the quality is good or not; moreover, we can also customize and produce electronic components that meet customer needs. For specific details, customers are welcome to come to consult. Your circuits are safer.
Primary protection of TVS tube SM8S series in automotive power lines
The SM8S series of load-shedding TVS tubes used for the primary protection of automotive power lines can be divided into two categories: epitaxial and non-epitaxial. In the reverse bias mode, they have similar breakdown operating characteristics; the difference is that the epitaxial TVS tube has low forward voltage drop characteristics in the forward mode, and the non-epitaxial TVS tube is under the same conditions. relatively high-pressure drop. This feature is especially important for the reverse voltage applied to the power line. In the reverse power input mode, the voltage of the power line is the same as the forward voltage drop of the TVS tube. In this case, it is easy to cause electronic circuit failure. At this time, the low forward voltage drop of the epitaxial TVS tube can solve this problem very well. question. Of course, there are other ways to protect the circuit from reverse power input damage. Interested partners can communicate with Dongwo Electronics FAE engineers.
The secondary protection of TVS tube SM8S series in automobile power line
The primary targets of protection circuits in automotive systems are high surge voltages, but the clamped voltages are still high. For this reason, secondary protection is especially important in 24V powertrains, such as those found in trucks and vans. The main reason for this is that most voltage regulators and DC-DC converter ICs can have a maximum input voltage of 45V-60V. In this case, it is recommended to add a resistor on the power line to reduce the transient current. At this time, a TVS tube with a smaller rated power can be used as a secondary protection.
For different automotive electronic equipment, the types of circuit protection components required are different. For specific circuit protection scheme design, protection component selection, product testing, and other services, Dongwo Electronics provide a one-stop service for you. Automotive grade TVS transient suppressor SM8S series, Dongwo Electronics is professional and serious!
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