4.0SMDJ14A

Series:	*
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Mounting Type:	Surface Mount
Package / Case:	DO-214AB, SMC
Supplier Device Package:	DO-214AB (SMCJ)

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4.0SMDJ SERIES TVS DIODES: APPLICATION FIELD AND WORKING PRINCIPLEThe 4.0SMDJ series of TVS (Transient Voltage Suppressor) diodes have been designed to help protect against surge and overload conditions. These devices have been manufactured by Vishay, a leading supplier of discrete semiconductor components for electronic systems around the world. They are versatile protection devices with a wide range of applications, making them an ideal choice for commercial, industrial, telecom, and automotive applications.A TVS diode is an active component that is used to protect circuits from transient events such as surges and spikes. These are sometimes referred to as surge protection diodes or thyristor surge arresters, and they are used to safeguard device integrity and functionality from high voltage occurrences. 4.0SMDJ TVS diodes are a variation of the basic TVS design, and they are constructed using a three-conductor configuration.The 4.0SMDJ series of TVS diodes have a unique dual-zone protection system that incorporates two dedicated regions within the diode. The first zone is responsible for absorbing fast-transient events, while the second zone carries out general-purpose protection. This dual-zone design makes the 4.0SMDJ series suitable for numerous applications where surge protection is important.The three conductors of a 4.0SMDJ TVS diode are connected to the device terminals in the following sequence – anode, gate, and cathode – with the cathode being the most common connection. The anode and cathode conductors are connected to the main power source, with the gate being electrically isolated between the anode and cathode.The anode and cathode are the two main parts of the 4.0SMDJ series, and they are responsible for controlling the voltage between them. When a surge or spike occurs, the anode and cathode act as a closed circuit, allowing current to flow. The flow of current causes the voltage between the anode and cathode to be reduced, which prevents sensitive circuitry from being damaged due to overvoltage.The gate of the 4.0SMDJ series is used to control the opening and closing of the anode and cathode circuit. When the gate is closed, the anode and cathode are held in a floating state so that there is no current flow. When the gate is opened, the anode and cathode close to allow current flow. This allows the 4.0SMDJ series TVS diode to respond to changing conditions and quickly reduce the voltage by transitioning from a closed to an open state.The 4.0SMDJ series features high surge capacity and excellent long-term reliability, which makes it an excellent choice for commercial, industrial, telecom, and automotive applications. In addition, the dual-zone protection system makes it well-suited for applications with high current demands. The robust design ensures that the 4.0SMDJ series can withstand a wide range of conditions and provide effective protection against transient events.

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