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TVS - Diodes: MSMBJSAC75 Application Field and Working Principle

TVS diodes, also known as transient voltage suppressors (TVSs), are used to protect sensitive electronic circuits from transient overvoltage caused by lightning or other similar factors. These sensitive circuits are used in many applications, including automotive, industrial, communications, consumer, and aerospace and defense. The MSMBJSAC75 is a most popular and representative TVS diode, made by TDK Electronics, for use on the PCB for surge protection of automotive, consumer and commercial products that require robust performance.

What is the MSMBJSAC75?

The MSMBJSAC75 is a monolithic-chip TVS diode that is designed for surge protection. It offers an excellent combination of robustness, low capacitance and low clamping voltage. It is capable of handling extremely high surge currents and has an excellent tradeoff between surge capability and capacitance, allowing it to be ideal for applications that require low capacitance and low clamping voltage, such as USB devices, card readers and other similar applications. It also has a very short reverse recovery time for a high level of surge protection and is available in a compact SMD package for easy board layout.

Application Fields for MSMBJSAC75

The MSMBJSAC75 is suitable for many different applications. It can be used in automotive applications, consumer and commercial products, military and aerospace applications, and for communications and networking. It can also be used in power supplies, computers and peripherals, high-frequency and baseband components, RF modules, and a variety of other applications. Furthermore, the MSMBJSAC75 can be used to protect sensitive circuits in a wide range of applications, including consumer electronics, portable electronics, and in embedded systems, due to its high surge protection capabilities and low capacitance characteristics.

Working Principle

The MSMBJSAC75 is a TVS diode that combines a low-capacitance P-N junction with a low-capacitance back-to-back zener diode. The P-N junction is an ideal device for clamping overvoltages while the zener diode provides protection against sustained overvoltage. In normal operation, when no surges are present, the device is in its low-capacitance, low-leakage, low-loss state. When an overvoltage surge is detected, however, the device will start to leak current, increasing in impedance until it reaches the peak level, at which point the voltage across the device has reached its clamping voltage. This will downscale the voltage before it can damage the protected device.

The device is designed to clamp any overvoltage transients, and to limit the time it stays in its active, high-impedance state. When the surge has passed and the voltage on the device drops below the zener breakover voltage, the device will return to its low-capacitance state, allowing signals to pass unimpeded. This feature makes the MSMBJSAC75 an ideal choice for applications where surge protection is essential, but where low capacitance is also critical.

Conclusion

The MSMBJSAC75 is an excellent choice for applications where surge protection is essential, and where low capacitance is also desired. It is suitable for a wide range of applications, including automotive, consumer, military and aerospace, and communication and networking. The low capacitance of the device ensures that it will not interfere with signal or data path, and the low clamping voltage ensures that it will provide robust surge protection to sensitive circuits. It is available in a variety of packages for easy board layout, and is a cost-effective solution for providing effective surge protection.

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