SMCJ140CA

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The SMCJ140CA is a subminiature, lead-mounted TVS Diode designed to protect electronic components from voltage spikes caused by external or internal transients. It provides excellent protection and is particularly well suited for applications where fast response and very low capacitance are essential. The SMCJ140CA is suitable for a variety of applications, including portable electronics, computers, automotive electronics, and RF/wireless communication devices.

SMCJ140CA Application Field

The SMCJ140CA is ideal for use in a wide variety of applications, including AC/DC circuit protection, overvoltage/surge/transient protection, and ESD protection. Its low capacitance may be advantageous in applications where minimal circuit disruption is desired. It is especially suitable for portable electronics, computers, automotive electronics, and RF/wireless communication devices where a wide range of protection features are required across a broad power spectrum. The device is rated for ESD protection up to 15kV in both the human body model (HBM) and machine model (MM).

SMCJ140CA Working Principle

The SMCJ140CA is based on the Avalanche surge current protection device principle. It is a unidirectional device and is designed to protect components and signal lines from overvoltage transients and to dissipate associated energy safely. When the circuit is overstressed by an external transient or surge, a bidirectional current pulse (I/T) is generated between the anode and cathode of the device. The anode then experiences a abrupt voltage rise which causes avalanche breakdown into the junction. The resultant large increases in current (I/T) cause the device to clamp the voltage at a safe level, thus protecting the device from damage.

The clamping characteristics of the SMCJ140CA enable it to be used in applications where a low clamping voltage is desired. The device features low capacitance, low leakage current, and fast response time. The device is designed to dissipate energy in the avalanche mode of operation, reducing the repetitive peak power dissipation. Its structure also reduces thermal runaway conditions, improving the device reliability.

Summary

The SMCJ140CA is a lead-mounted TVS Diode that is ideal for AC/DC circuit protection, overvoltage/surge/transient protection, and ESD protection. It is designed for use in a variety of applications, including portable electronics, computers, automotive electronics, and RF/wireless communication devices. The device is based on the Avalanche surge current protection device principle and is designed to protect components and signal lines from overvoltage transients and to dissipate associated energy safely. The device features low capacitance, low leakage current, fast response time, and low clamping voltage. Its structure also reduces the number of thermal runaway conditions, improving its reliability and making it ideal for a wide range of applications.

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