3.0SMCJ51ATR Circuit Protection

Voltage - Clamping (Max) @ Ipp:	82.4V
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:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	3000W (3kW)
Current - Peak Pulse (10/1000µs):	36.4A
Series:	--
Voltage - Breakdown (Min):	56.7V
Voltage - Reverse Standoff (Typ):	51V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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IntroductionThe 3.0SMCJ51ATR is a type of unidirectional, transient voltage suppressor (TVS or TVSP) diode which is commonly used for protecting sensitive electronics from transient electrical events such as ESD (electrostatic discharge) and line spikes. It is a “dual complementary” device meaning it is composed of two components with opposite characteristics, which together act to suppress electrical transients.Protection of Sensitive ElectronicsTVS diodes provide an extra level of protection for sensitive electronic components and systems, preventing damage caused by short-duration, high-voltage spike events such as those generated by lightning or ESD. The 3.0SMCJ51ATR is specifically designed to offer protection from these events by clamped voltage levels while providing low leakage levels for high-frequency operation.It is capable of clamping voltage levels up to 18V and provides up to 5.0A of peak current. This combination of high clamping voltage and high current tolerance makes it suitable for protecting various common electronic devices, including telecommunications and automotive systems. In addition, it is able to handle high temperatures (up to 150°C) making it a reliable solution for these types of applications.OperationThe 3.0SMCJ51ATR operates on the principle of zener effect. When a transient voltage event occurs, the device starts conducting and will clamp the voltage to certain level thus diverting the overvoltage spike away from the protected electronics.The device is composed of two most common structures of suppressive diode, the zener diode and the PNPN diode, which work together to provide the best protection. The zener diode is effective in clamping voltage levels up to 18V, while the PNPN diode is capable of withstanding peak current levels up to 5.0A. These two structures are connected together in a series opposition which makes them work in a complementary manner. When the voltage reaches the zener diode’s breakdown voltage, it starts to break down and begins conducting current. This overflows to the PNPN structure which then further reduces the voltage by rectifying it and also absorbs the spike current. This process of current and voltage clamping prevents the spike from damaging the sensitive electronics.ConclusionThe 3.0SMCJ51ATR is an ideal unidirectional, transient voltage suppressor (TVS or TVSP) diode that provides superior performance and protection for sensitive electronics, from a range of transient electrical events. It operates on the principle of zener effect, and is a “dual complementary” device with zener and PNPN structures, capable of clamping voltages up to 18V and peak current levels up to 5.0A. It is suitable for protecting various types of electronic components in various applications ranging from telecommunications and automotive systems, and it is able to handle high temperatures up to 150°C, making it a reliable solution for these types of applications.

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