SMLJ40CAE3/TR13 Circuit Protection

Current - Peak Pulse (10/1000µs):	46.4A
Base Part Number:	SMLJ40
Supplier Device Package:	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:	300W
Series:	--
Voltage - Clamping (Max) @ Ipp:	64.5V
Voltage - Breakdown (Min):	44.4V
Voltage - Reverse Standoff (Typ):	40V
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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TVS – DiodesThe SMLJ40CAE3/TR13 is a transient voltage suppressor diode, also known as a TVS. These diodes are generally used for protecting sensitive electronic components and devices from electrical overstress (EOS) caused by electrical transients such as inductive kick-back and voltage spikes. The SMLJ40CAE3/TR13 is a bi-directional low voltage device capable of handling up to 40V and providing a maximum peak current of 24A.Working PrincipleThe working principle of the SMLJ40CAE3/TR13 is based on the Zener breakdown principle. When a diode is applied to an external voltage that is greater than the breakdown voltage of the device (Vbr) the diode will enter Zener breakdown. During Zener breakdown, the diode’s depletion region expands and the P-N junction of the diode is forward biased and current begins to flow. This current flow is limited by the internal impedance of the diode and causes a voltage drop across the diode. If the external voltage continues to rise, the current through the diode will increase until the diode is fully conductive, at which point it will clamp the voltage to its Vbr value.Application FieldsThe SMLJ40CAE3/TR13 is a useful tool for protecting electronic components and circuits from the detrimental effects of EOS due to transients. It is suitable for protecting power supplies, such as DC-DC converters, power over ethernet, and automotive applications, as well as for protecting logic circuits and high-speed data lines from damaging transients. This device is also commonly used on the computer motherboard where transients can occur due to a changing load, spike suppression, or static charge.The SMLJ40CAE3/TR13 is available in a Surface Mount (SM) package, which is convenient for use in printed circuit board (PCB) applications, and the device can operate over a wide temperature range of -55°C to +125°C. The device also offers superior ESD protection, with a typical ESD protection threshold of 2.4kV.ConclusionThe SMLJ40CAE3/TR13 is a transient voltage suppressor diode used to protect sensitive electronic devices from electrical overstress caused by transients. It is capable of handling up to 40V and providing a maximum peak current of 24A. The device offers excellent ESD protection and is available in a Surface Mount (SM) package for use in PCB applications. The SMLJ40CAE3/TR13 can be used in a wide variety of applications, such as in power supplies, logic circuits, and high-speed data lines, and also on the computer motherboard.

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