SMLJ40A-QH

Current - Peak Pulse (10/1000µs):	46.4A
Supplier Device Package:	SMC (DO-214AB)
Package / Case:	DO-214AB, SMC
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	3000W (3kW)
Series:	Automotive, AEC-Q101, SMLJ
Voltage - Clamping (Max) @ Ipp:	64.5V
Voltage - Breakdown (Min):	44.4V
Voltage - Reverse Standoff (Typ):	40V
Unidirectional Channels:	1
Moisture Sensitivity Level (MSL):	--
Type:	Zener
Lead Free Status / RoHS Status:	--
Part Status:	Active

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。TVS – Diodes & SMLJ40A-QH Application Field and Working PrincipleTVS (Transient Voltage Suppressor) Diodes, also commonly referred to as “avalanche diodes”, are special semiconductor components used to protect sensitive electronic devices from overvoltage and transients. They are important components in a wide range of electronic products, especially products that function under high-voltage or in rough environmental conditions.The SMLJ40A-QH is a TVS Diode manufactured by ON Semiconductor. It is designed to insure protection devices remain operational in the harshest conditions. It offers advanced levels of performance for transient overvoltage protection. This component offers 1500W of peak pulse power capability at 10/1000μs. Maximum clamping voltage (Vc) is 40V. It features a Fast Response Time of 10ns, and a Low Leakage Current of 5μA.The SMLJ40A-QH is designed for ease of use and reliable performance in a wide variety of applications, such as Automotive, Data Communication, Power Supplies, Industrial, and Consumer applications. In Automotive applications, it is used to protect vehicles from voltage transients and surges. In Data Communication, it is used to protect computers and communication networks from voltage spikes and transients. It is also used in Power Supplies for overvoltage protection and controller circuitry. In Industrial applications, it is used to protect sensitive industrial equipment from voltage transients. And, in Consumer applications, it is used to protect consumer electronics from voltage surges and transients.The SMLJ40A-QH provides valuable protection from overvoltage and transients, and its fast response and low leakage current characteristics make it an ideal choice for sensitive applications. But, how does this device actually work?The SMLJ40A-QH works by using an avalanche transistor structure to quickly and efficiently divert excessive currents away from the protected circuits. This is done by triggering the PN junctions to temporarily act as a non-ohmic switch. The avalanche diode can handle pulse currents of up to 1500W, and its rated voltage is 40V. It also features a low leakage current of 5μA.The SMLJ40A-QH also offers reverse biasing protection against voltage transients. In other words, when the voltage exceeds the rated value of the diode, it is configured to rapidly become a low-resistance conductor, allowing the excess voltage to be dissipated into the external environment. This is accomplished by the steep increase in current with increasing voltage.The SMLJ40A-QH is essentially a protection device that quickly switches on and off in rapid succession when an overvoltage occurs. This allows excess voltage to be neutralized before permanent damage is done to the protected circuits.In summary, the SMLJ40A-QH is a reliable and effective TVS diode with a fast response time and low leakage current characteristics. It is a valuable component for protecting circuits from high voltages in a wide range of applications. Its avalanche diode structure makes it well-suited to handle rapid voltage changes, and its reverse-biasing protection ensures these changes can be dissipated before permanent damage is done.

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