QSBT40-7-F Circuit Protection

Current - Peak Pulse (10/1000µs):	--
Base Part Number:	QSBT40
Supplier Device Package:	SOT-363
Package / Case:	6-TSSOP, SC-88, SOT-363
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 125°C (TJ)
Capacitance @ Frequency:	10pF @ 1MHz
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	--
Series:	--
Voltage - Clamping (Max) @ Ipp:	--
Voltage - Breakdown (Min):	--
Voltage - Reverse Standoff (Typ):	30V
Unidirectional Channels:	4
Type:	Steering (Rail to Rail)
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Diodes

TVS (Transient Voltage Suppressor,TVS )-Diodes, are voltage-dependent, non-linear devices more commonly known as “avalanche” diodes. These devices are designed to protect electronic systems from transient overvoltage conditions such as electrostatic shocks, voltage spikes, and voltage surges (lightning). TVS diodes are able to do this by clamping the voltage level to a safe maximum.The QSBT40‐7‐F is a bi‐directional TVS diode with a working voltage of 40V and a maximum working current of 6A. This diode also offers a working reverse voltage of 7V and a maximum surge peak pulse power of 1500W.

Application Field

The QSBT40-7-F TVS Diode is used mainly in automotive, lighting, and industrial applications. It can be used in wide range of applications such as protecting low voltage systems, automotive wiring, relay circuits, and engine control systems.

Working Principle

A TVS diode works by clamping the voltage level to a safe high voltage by using its “reverse bias breakdown” working principle. This principle works by applying a reversed bias to the diodes which causes a large electric field to be built up between the p -type and n -type layers. When this electric field reaches a certain point the diode “breaks down” and begins to conduct current in the reversed direction. The diode uses this effect to prevent voltage spikes by stabalizing them to a safe value. The QSBT40‐7‐F is a bi‐directional diodes which means it is able to protect any system from both positive and negative voltage spikes. It does this by using the “forward biasing” principle which occurs when a voltage applied to the diode causes it to conduct in the forward direction. The diode will then conduct any voltage spikes and limit them to a safe it safe value. The device also features an “avalanche” effect which occurs when the reverse bias breakdown voltage is exceeded. This effect causes a chain reaction in the diode resulting in a very low on-state resistance and low power dissipation. The avalanche effect also allows the diode to dissipate very large spikes without melting or damaging the diode.

Conclusion

The QSBT40‐7‐F TVS-diode is a bi-directional device and is a great choice for automotive, lighting, and industrial applications. It provides protection from both positive and negative voltage spikes and uses the avalanche effect to ensure safety and prevent damage to the diode. It is an efficient and reliable way of protecting against transient overvoltage conditions.

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