DT1140-04LP-7 Circuit Protection

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TVS (Transient Voltage Suppression) diodes may be one of the most efficient and cost-effective ways of protecting circuits against transients. The DT1140-04LP-7 is a transient suppression diode from Deutsche Technologie that offers high wear and tear resistance with low reverse leakage current and is designed for a wide range of applications. In this article, we will discuss the application field and working principle of the DT1140-04LP-7.

Application Field of DT1140-04LP-7

Typically, the DT1140-04LP-7 is used in automotive and industrial electronics where protection against transients is a necessity. It is used in applications such as automotive controllers, engine control modules, fuel injection systems, and LED lighting systems. The device is also used in medical devices, optical drives, power supplies, power tools, and other industrial electronics.

The conventional unidirectional breakdown voltage (VRWM) of this device is 11.4 V, with a 5% variation, and this makes it suitable for a variety of voltage spike scenarios. The peak pulse power dissipation (Ppk/w) for the DT1140-04LP-7 is up to 400 W, making it suitable for high-power transient suppression applications. The device also has a very low stand-off voltage of 2.5 V and it can be effectively used in applications where transient voltage suppression is required without clamping the signal line.

Working Principle of DT1140-04LP-7

The working principle of the DT1140-04LP-7 is based on the simple PN junction diode. The diode is constructed using a single PN junction made with a broad area silicon material. The device has a built-in surge current limit of 2A, which helps protect the output signal from excessive current flow. The device works in combination with a series resistor to provide protection against transients.

When the voltage increases to the specified breakdown voltage (VRWM) of the DT1140-04LP-7, the diode starts conducting and the current starts flowing. The current is limited by the series resistor which reduces the amount of current flowing in the circuit. When the voltage falls below the specified lev~l, the diode stops conducting and the current flow is interrupted.

The short recovery time, low leakage current, and low reverse stand-off voltage make the DT1140-04LP-7 an ideal device for transient voltage suppression applications. The device is also designed to withstand a wide temperature range, from -55°C to 150°C, and is tested for high reliability.

Conclusion

The DT1140-04LP-7 is a transient voltage suppression device from Deutsche Technologie that is used in a variety of applications, including automotive and industrial electronics. The device is constructed using a single PN junction and has a low stand-off voltage of 2.5 V and a conventional unidirectional breakdown voltage (VRWM) of 11.4 V, with a 5% variation. The working principle of the DT1140-04LP-7 is based on a series diode and resistor combination, with the diode being limited by the series resistor. The device is designed to withstand temperatures up to 150°C and is tested for high reliability.

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