SM6S18AHE3/2D

Current - Peak Pulse (10/1000µs):	158A
Base Part Number:	SM6S
Supplier Device Package:	DO-218AB
Package / Case:	DO-218AB
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 175°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	4600W (4.6kW)
Series:	Automotive, AEC-Q101, PAR®
Voltage - Clamping (Max) @ Ipp:	29.2V
Voltage - Breakdown (Min):	20V
Voltage - Reverse Standoff (Typ):	18V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Diodes
The SM6S18AHE3/2D is a TVS diode, manufactured by Littelfuse. It is a unidirectional, bidirectional, and ESD protection diode. TVS diodes are designed to provide surge protection in circuits, where a voltage spike or transient occurs in the power supply. They are commonly used in automotive, industrial or general-purpose, power supply applications. They are also used in communication systems, electrical equipment, and portable electronic devices.
Application Field
The SM6S18AHE3/2D protects both AC and DC circuits in a wide range of applications. It can be used in consumer electronics, power supplies, computers, telecom systems, automotive, industrial, and healthcare electronics applications. This diode offers robust protection for both AC and DC power systems and is effective against ESD, EFT, and other transient surge events. The SM6S18AHE3/2D is especially suitable for automotive applications due to its low capacitance and low leakage current.
Working Principle
A TVS diode is an active semiconductor device which acts as a simple clamp and interrupts a power surge. It operates by diverting the unwanted transient voltage away from the protected circuit. The diode works by connecting the anode of the diode to the power supply line and the cathode of the diode to a reference voltage. When a transient voltage appears in the power supply line, the diode is triggered, diverting the voltage from the power line towards the reference voltage.
The SM6S18AHE3/2D is designed to provide superior protection for the downstream circuits. It features a low capacitance and low leakage current, which makes it ideal for automotive applications. The diode also features an internal secret anti-parallel crowbar circuit which helps to reduce the power line surge and ringing. Additionally, the diode has an integrated thermal protection system which helps to reduce the overall power dissipation in the device.
Conclusion
The SM6S18AHE3/2D is a popular choice for a wide range of consumer, industrial, and automotive applications. It is designed to provide robust protection for both AC and DC circuits. The diode works by connecting the anode to the power supply line and the cathode to a reference voltage. This triggers the diode which diverts the transient voltage away from the protected circuit. Additionally, the diode features an integrated thermal protection system which helps to reduce the overall power dissipation.

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