CD143A-SR70 Circuit Protection

Voltage - Clamping (Max) @ Ipp:	7V
Supplier Device Package:	SOT-143
Package / Case:	TO-253-4, TO-253AA
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	10pF @ 1MHz
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	--
Current - Peak Pulse (10/1000µs):	24A (8/20µs)
Series:	--
Voltage - Breakdown (Min):	--
Voltage - Reverse Standoff (Typ):	--
Unidirectional Channels:	2
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: CD143A-SR70 Application Field and Working Principle

Transient Voltage Suppressor (TVS) diodes are an important class of semiconductor components used to protect circuit boards, I/O interfaces, data/communications lines, and other electronic components from transient peaks in voltage. They are often employed in applications where a surge of transient voltage could cause damage to sensitive devices or circuit boards. The CD143A-SR70 is a popular TVS diode used in a variety of industrial, medical, commercial, automotive, and telecommunications applications. This article will provide a brief overview of its application field and working principle.The CD143A-SR70 is a surface-mount device that offers low capacitance and excellent clamping performance in high-speed and high-frequency transient voltage surge suppression (TVSS) applications. It is especially suitable for I/O protection. Its ESD (Electrostatic Discharge) capability of ±30kV make it robust and suitable for a wide variety of uses.The CD143A-SR70 is highly reliable and capable of handling high-current pulses up to 475A (1s). It is RoHS-compliant and has a life expectancy of more than 20 years. It is capable of absorbing 6x surge power at 1.2ns pulse width and a surge current of up to 475A. The diode has a maximum reverse leakage current of 0.4mA at 8V and 0.2mA at 30V. The TVS diode typically offers a breakdown voltage (VBR) ratings from 5V to 80V with a tolerance of ±30%.The working principle of the CD143A-SR70 is quite straightforward. It consists of two back-to-back Zener diodes. When the voltage across the diodes exceeds their specified breakdown voltage, the diodes start to conduct, releasing energy in the form of a surge. This surge is released and absorbed by the TVS diode, which prevents it from reaching other components in the circuit.The CD143A-SR70 serves important applications such as military and aerospace, telecommunication, automotive, test and measurement, industrial, medical, computer/laptop, and consumer electronics. In military and aerospace applications, the diode is used to protect components against high-voltage transient surge pulses caused by ESD, EMI, lighting, or other environmental conditions.In telecommunication and optical network applications, the TVS diode is used to protect sensitive parts of the system. It is also used in automotive applications, such as audio, video, navigation systems, and engine control modules, to protect them from damage due to power surge, high-voltage flybacks, and other electricity-related problems. Furthermore, the CD143A-SR70 is used in industrial, medical, and computer/laptop applications to protect against ESD and EMI problems.In conclusion, the CD143A-SR70 is a popular TVS diode used in a variety of industrial, medical, commercial, automotive, and telecommunications applications. It has a low capacitance and provides excellent clamping performance in high-speed and high-frequency transient voltage surge suppression (TVSS) applications. It is highly reliable and capable of absorbing up to 6x surge power at 1.2ns pulse width and a surge current of up to 475A. Additionally, the diode has an ESD (Electrostatic Discharge) capability of ±30kV. Its breakdown voltage (VBR) ranges from 5V to 80V with a tolerance of ±30%. With its wide range of applications, the CD143A-SR70 is an indispensable component in many electronic systems.

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