MSMBJ28A/TR Circuit Protection

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TVS - Diodes, or Transient Voltage Suppresser Diodes, are a type of diode specifically optimized and designed to provide fast, effective protection from over-voltage transients in power and electronic systems. The MSMBJ28A/TR is a uni-directional, 400W component that offers low-capacitance protection against over-voltage transients. It is ideal for use in 5V, 10V and 20V applications, such as AC/DC wall adapters, Ethernet ports, digital cameras, and modems.

Application Field

The MSMBJ28A/TR is ideal for use in electronic systems where the impacts of transient overvoltage bring a risk of loss or damage to the circuit or surrounding component. These electric or electro-mechanical systems generally belong to the following categories:

• Consumer electronic equipment
• Telecom systems
• Industrial process control
• Global Positioning System (GPS)
• Aircraft, aerospace, and military
• Avionics and local area networks (LAN)
• Computer and peripheral equipment

The MSMBJ28A/TR is especially useful for applications involving high-speed data and power interfacing. As a uni-directional diode, it can be used in most types of equipment where protection from transient voltage overshoots is necessary. Common applications include:

• Protection against Electrostatic Discharge (ESD)
• Circuit protection against over-voltage transients
• Surge protection in audio equipment
• Protection against lightning induced surges

Working Principle

The MSMBJ28A/TR operates on the principle of ‘reverse filamentary breakdown conduction’. This means that the component can effectively absorb and manage the power resulting from over-voltage pulses and distribute it over a large area. As a result, it reduces the voltage stresses on the circuit and its components.

When the applied voltage reaches the component’s ‘breakdown voltage’, electrical current begins to flow through the diode. Within nanoseconds (10-9s), the diode starts to act as a closed switch which limits the voltage to a safe level. This process continues until the transient voltage is discharged or absorbed.

The MSMBJ28A/TR also has an avalanche breakdown voltage which triggers at a lower voltage than the standard breakdown. These two breakdowns work in conjunction with each other, providing trustworthy and effective protection against transient over-voltage.

The main advantages of the MSMBJ28A/TR are its low capacitance rating- typically around 10pF- and, due to its symmetrical design, its relatively low clamping voltage of 28V. This makes the component suitable for high-speed data applications in which signal integrity and relative efficiency are essential.

In conclusion, the MSMBJ28A/TR uni-directional diode is a reliable and affordable option for protecting electrical and electro-mechanical systems in consumer, telecommunication, and commercial applications from high-voltage transients and over-voltage pulses. Its uniquely designed structure offers low clamping voltage, low capacitance, and a symmetrical design that ensures maximum signal integrity. This reliable protection makes the MSMBJ28A/TR ideal for use in a broad range of electronic systems.

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