MA1.5KE56AE3

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Transient Voltage Suppressors (TVS) are widely used for their protective functions in power electronics applications. TVS Diodes, also known as unidirectional and bidirectional suppressors, are one of the most important components in the power electronics protection schemes.

The MA1.5KE56AE3 is a 150W, 12V transil diode designed to protect against high energy repetitive or transient over-voltages. It is a unidirectional device providing over-voltage protection in 1.5 kV using 12V breakdown VBR. The diode is compliant with the latest surge waveforms, including the IEC 61000-4-5 international standards, specifically designed for the protection of I/O, power supply and communication lines. It combines the advantages of both a fast unidirectional clamping mechanism and a protection against over-voltages.

The device’s application field includes power supply circuits, LED lighting, automotive, medical and industrial equipment. The diode is well-suited for overvoltage protection in these fields, due to its low clamping voltage, fast response time and high surge capability. Thus, it can provide excellent protection against transients such as electrostatic discharge (ESD) and electrical fast transients (EFT).

The working principle of the MA1.5KE56AE3 device is based on the PN junction breakdown concept. The PN junction is mounted in a ceramic low inductance package, which contains a high resistance resistor and two transistors. The resistor protects the PN junction by providing an initial path for any transient current. The first transistor acts as a switch, which allows the resistor to protect the PN junction and prevents the transient current from flowing directly to the PN junction. The second transistor serves to limit the overvoltage generated by the resistor.

When a transient voltage occurs, the switch is activated, allowing current to partially or completely short circuit the transient voltage. This reduces the over-voltage and protects the device from permanent damage. The resistor creates a voltage drop of 0.6 volts to fully suppress the transient over-voltage, allowing the device to protect the system from over-voltages and surges.

In conclusion, the MA1.5KE56AE3 is a fast acting transient voltage suppressor diode designed for automotive, medical, industrial and power supply circuit protection. It provides high surge capability, fast response time and low clamping voltage. The protection principle is based on the PN junction breakdown concept, enabled by a combination of transistors and resistor.

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