SMAJ440A-H

Voltage - Clamping (Max) @ Ipp:	713V
Supplier Device Package:	SMA (DO-214AC)
Package / Case:	DO-214AC, SMA
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	400W
Current - Peak Pulse (10/1000µs):	600mA
Series:	SMAJ
Voltage - Breakdown (Min):	492V
Voltage - Reverse Standoff (Typ):	440V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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SMAJ440A-H TVS-Diodes play an important role in protecting delicate electrical equipment from irreparable damage caused by voltage spikes. They are bidirectional, voltage-dependent semiconductor devices that are designed to clamp high voltage levels in case of an electrostatic discharge, electrical overstress, or other events that can cause a damaging voltage surge. The peak surge current rating of these diodes is higher than that of standard rectifiers, making them well suited for protecting sensitive electronic components from overvoltage damage.The SMAJ440A-H TVS-Diodes are constructed with a junction between semiconductor material – typically silicon – and a metal electrode. In normal operation, the device is nonconductive and does not affect the circuit’s electrical flow. When subjected to a transient surge of greater than a predetermined amplitude or duration, the junction becomes conductive and the device turns on. This breakdown voltage is rated in a device’s datasheet.The SMAJ440A-H TVS-Diodes also have built-in junction capacitance which provides a further form of voltage protection. When the device is triggered, this capacitance gradually stores up charge until it can support the applied voltage, limiting the voltage peak and allowing the device to conduct. This capacitance is negative temperature coefficient, meaning that the device responds more slowly to transient pulses in cold temperatures than in hot temperature.When an applied voltage is within the breakdown voltage specification of the SMAJ440A-H TVS-Diode, the device begins to conduct current and automatically limits the current through its leads. This protects the sensitive components downstream of the diode by limiting the voltage and current that can enter those components. The current it can support is limited by its power rating, with values as high as 1200W available in certain sizes of the SMAJ440A-H. After the surge passes, the diode reverts back to its open state.The SMAJ440A-H TVS-Diodes are popular in a number of different applications, including portable electronics, cell phone handsets, computers, automotive electronics, and industrial electronics. They offer high surge current protection and are available in various packages and sizes, making them suitable for a wide range of applications.In conclusion, SMAJ440A-H TVS-Diodes offer an effective means of protecting sensitive equipment from voltage surge events. Their design incorporates a built-in capacitance to limit the voltage peaks and their high power rating makes them well-suited for high-power applications. SMAJ440A-H TVS-Diodes are available in various sizes and packages, allowing them to be used in a wide range of applications.

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