SMBJ45CAHM4G

Voltage - Clamping (Max) @ Ipp:	72.7V
Supplier Device Package:	DO-214AA (SMB)
Package / Case:	DO-214AA, SMB
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	600W
Current - Peak Pulse (10/1000µs):	8.6A
Series:	Automotive, AEC-Q101, SMBJ
Voltage - Breakdown (Min):	50V
Voltage - Reverse Standoff (Typ):	45V
Bidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to TVS-DiodesTransient voltage suppressors (TVS) or surge-suppressing diodes have gained a wide range of acceptance in the design of mission-critical circuits. A TVS is a type of unidirectional zener-based or avalanche-based diode used to protect electronic circuits from over-voltage due to a transient such as an electrostatic discharge (ESD) or induced electrical surges. The TVS diode is typically used in telecom, industrial and automotive applications when added protection from unforeseen voltage overshoots is required.SMBJ45CAHM4G Application Field and Working PrincipleThe SMBJ45CAHM4G from Diodes Incorporated is a 400W unidirectional transient voltage suppression (TVS) diode that provides protection from damage caused by transient over-voltage faults. The SMBJ45CAHM4G is designed to protect sensitive electrical equipment from voltage transients generated by lightning, inductive switching loads, ESD, EFT, and electrical surges. Typical applications include industrial, telecom, datacom, consumer electronics, and automotive.The SMBJ45CAHM4G TVS diode’s structure includes a high power Zener diode connected with a low resistance avalanche diode in parallel. The flow of current is only possible when the anode voltage is above the breakdown voltage of the Zener diode. If the voltage exceeds the breakdown voltage of the Zener diode, the anode-cathode current flows through the Zener diode and the avalanche diode simultaneously. The Zener diode allows the maximum Peak Pulse Power (PPP) current for the specified duty cycle on the specified load. The avalanche diode can sustain the pulse current till the Zener diode recovers from the breakdown.The low dynamic impedance offered by the avalanche diode provides faster response times when subject to transients. The fast response and high power capability of the SMBJ45CAHM4G TVS diode makes it ideal for protecting against electrical surges caused by ESD and EFT events. The SMBJ45CAHM4G is designed in a small and lead-free SMB surface mount package, making it a great option for add-on transient voltage protection in PC board design.ConclusionThe Diodes Incorporated SMBJ45CAHM4G is the perfect combination of design and performance to effectively protect sensitive circuits from over-voltage transient events. With fast response times and a low dynamic impedance, the SMBJ45CAHM4G is an excellent choice for a variety of applications, including industrial, telecom, datacom, consumer electronics, and automotive. By offering superior protection and performance, the SMBJ45CAHM4G can help keep today’s circuits protected from transient voltage events.

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