SM6T39AHE3/5B Circuit Protection

Series:	Automotive, AEC-Q101, SM6T, TransZorb®
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Zener
Unidirectional Channels:	1
Voltage - Reverse Standoff (Typ):	33.3V
Voltage - Breakdown (Min):	37.1V
Voltage - Clamping (Max) @ Ipp:	53.9V
Current - Peak Pulse (10/1000µs):	11.1A
Power - Peak Pulse:	600W
Power Line Protection:	No
Applications:	Automotive
Capacitance @ Frequency:	--
Operating Temperature:	-65°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	DO-214AA, SMB
Supplier Device Package:	DO-214AA (SMBJ)
Base Part Number:	SM6T

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TVS – DiodesA Transient Voltage Suppressor (TVS) diode is a form of diode designed to protect sensitive electronic equipment from voltage surges caused by Electro Static Discharge (ESD), Electromagnetic Interference (EMI) andinduced lightning. TVS-Diodes are designed to clamp the voltage to within a safe level to protect downstream electronics from damage or destruction due to high voltage transients. The SM6T39AHE3/5B is specifically designed to protect against damage to automotive ECUs against high voltage transient events. The SM6T39AHE3/5B can handle up to 400Watts of power and has an operating voltage of 72V, while offering 85% of peak pulse power dissipation over a 10/1000 microsecond time frame. It features a low clamping voltage of 40V (±20V) at 200A of 8/20µs waveform, while also providing a high degaussing capability, which makes it ideal for automotive ESD protection applications.The working principle of a TVS diode can be explained as follows. When an over-voltage is applied to the diode, the diode becomes forward biased, triggering it to conduct. This causes a redistribution of charge, allowing for the voltage to be safely clamped or dissipated into the ground. The SM6T39AHE3/5B features a high forward voltage of 0.70V at 1A(IL), as well as a low leakage current of 0.01µA (ID=1mA). This means that the diode can effectively clamp or absorb higher voltages without drawing too much current, allowing it to prevent damage to downstream electronics.The SM6T39AHE3/5B is a surface mount device and is small in size, allowing it to fit into space constrained automotive designs. It is capable of dissipating large amounts of power, with a peak pulse power dissipation of up to 400W. It is also low cost and has a wide operating temperature range of -55°C to 150°C, making it suitable for use in a variety of automotive ESD protection applications.In conclusion, the SM6T39AHE3/5B is an ideal TVS diode for electrostatic and electromagnetic interference protection in automotive applications. It is capable of dissipating large amounts of power, has a low clamping voltage and features a wide operating temperature range. The small size makes it suitable for space constrained automotive designs, and the low cost makes it an attractive choice for designers looking to protect their automotive ECUs from high voltage transients.

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