CD143A-SR05 Circuit Protection

Voltage - Clamping (Max) @ Ipp:	20V
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:	Ethernet
Power Line Protection:	Yes
Power - Peak Pulse:	500W
Current - Peak Pulse (10/1000µs):	30A (8/20µs)
Series:	--
Voltage - Breakdown (Min):	6V
Voltage - Reverse Standoff (Typ):	5V (Max)
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

The CD143A-SR05 is a type of two-terminal, unidirectional Transient Voltage Suppressor (TVS) diode specifically designed to protect downstream connection from being damaged by sudden voltage spikes and electrostatic discharges. With its protective capabilities, it is used extensively in applications such as personal computers, automotive, and office equipment. This article looks at the CD143A-SR05 application field and working principle.

CD143A-SR05 Application Field

The CD143A-SR05 is designed and manufactured for protection from electrostatic discharge (ESD) and lightning. Its special construction makes it well suited for protecting sensitive components and devices from ESD or surges. This makes them ideal for use in a variety of applications, such as:

• Cellular / Telephone Equipment
• Computer and Peripheral Connections
• Automotive Components
• Power Supplies and Components
• Elevators, Robotics, and Industrial Control Applications
• Home Automation Devices

CD143A-SR05 Working Principle

The CD143A-SR05 is designed to protect against high-voltage spikes and surges. When a voltage spike or surge (overvoltage) is encountered by the TVS diode, it is automatically activated to prevent component damage by clamping down the voltage. This is done by absorbing the excess energy and then diverting it away from the downstream connection. The CD143A-SR05 is capable of activating within nanoseconds, which is much faster than a fuse or other traditional protection mechanisms.The CD143A-SR05 is constructed using a Zener diode and a low capacitance transient suppression element. When activated, the Zener diode limits the upper voltage while the transient suppression element provides a low impedance current path, thus diverting the extra energy away from the downstream connection. This construction makes the TVS diode highly effective in providing protection from voltage spikes and surges.The CD143A-SR05\'s rates of protection are 300W (10/1000µ s) for lightning surge application and 30W (8/20µs) for ESD application. It has an 8/20µs pulse power rating of 30W and can handle current up to 5A (8/20µs). It is also qualified to AEC-Q101 standards, making it suitable for automotive applications. In summary, the CD143A-SR05 is a two-terminal, unidirectional TVS diode specially designed for protecting downstream connection from sudden voltage spikes and ESD. Its special construction and performance capability makes it suitable for a variety of applications, including: cellular/telephone equipment, computer and peripheral connections, automotive components, power supplies and components, elevators, robotics and industrial control applications, and home automation devices. It is constructed using a Zener diode and a low capacitance transient suppression element. This ensures the CD143A-SR05 provides robust protection against ESD and lightning.

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