SA40AHE3/73 Circuit Protection

Voltage - Clamping (Max) @ Ipp:	64.5V
Supplier Device Package:	DO-204AC (DO-15)
Package / Case:	DO-204AC, DO-15, Axial
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 175°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	500W
Current - Peak Pulse (10/1000µs):	7.8A
Series:	Automotive, AEC-Q101, TransZorb®
Voltage - Breakdown (Min):	44.4V
Voltage - Reverse Standoff (Typ):	40V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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TVS - Diodes: SA40AHE3/73 Application Field and Working Principle

TVS (Transient Voltage Suppressor) diodes are components used in electrical devices to protect against sudden and unexpected power shorts or spikes. This article presents the application field and working principle of the SA40AHE3/73, a type of TVS diode. The SA40AHE3/73 is an ultra-small SOT-23 package with a typical ESD clamping voltage of 8.8V. It is designed to protect small, low-power electronics from electrostatic discharge (ESD) and power fluctuations, and is suitable for consumer electronics, portable medical devices, and other low voltage applications requiring a low profile, cost-effective ESD protection solution.When a transient voltage is applied to the anode of the SA40AHE3/73, the avalanche breakdown of the diode occurs. This results in a short circuit between the anode and cathode, effectively Clamping the applied voltage and limiting the transient voltage. The protection provided by the SA40AHE3/73 is limited by the power it can dissipate, which is related to its breakdown voltage, the voltage at which the diode will turn on and clamp the applied voltage.The SA40AHE3/73 is most effective at protecting devices from electrostatic discharge, as it has an ultra-low breakdown voltage of 8.8V. This is far lower than most electrostatic discharges, which typically range from around 10V to 100V. In addition, the fast response time of the diode’s avalanche breakdown ensures that it can quickly clamp any transient voltage.The SA40AHE3/73 is also effective at protecting against power fluctuations. As the diode is triggered by a sudden change in voltage, it will clamp any sudden voltage spikes, thus preventing damage to the electronics. The diode is also well-suited for low-power applications, as its small size and low-cost make it a competitive choice for cost-sensitive designs.The SA40AHE3/73 is one of the most versatile and cost-effective TVS-diodes available, and is suitable for a wide range of applications. Its ultra-low breakdown voltage ensures that it can protect devices from electrostatic discharge, as well as sudden voltage spikes, making it a reliable choice for low-power electronics. Furthermore, its small size and low-cost make it a competitive solution for cost-sensitive designs.

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