SM15T15CA

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The SM15T15CA is a subminiature, 400 watt, bidirectional, Transient Voltage Suppressor (TVS) designed to protect two-terminal electronic circuits from high voltage transients. Typical applications for SM15T15CA include power supply input/output, telecom equipment, DC power/battery bus, industrial and commercial systems, electrical control and instrumentation. TVS diodes are "multi-injector" devices, so they can clamp even very fast transients with very low leakage current and minimal overshoot. The SM15T15CA offers a low capacitance of 1.0pF maximum, low on resistance of 0.6 ohms typical, and fast-response times of less than one nanosecond.

SM15T15CA is a bidirectional TVS diode, meaning that it can block equally well in both directions. The device has surge handling capability of up to 400 watts, making it suitable for protecting electronic systems that may experience fast transients of up to 400 watts or slower transients up to 32 watts. In terms of its clamping voltage, the SM15T15CA has a maximum clamp voltage of 12 volts, and a maximum breakdown voltage of 5.5 volts. This is in conformity with the typical forward breakover voltage for a TVS diode, which is typically always lower than the PIV rating.

The working principle of the SM15T15CA is based on the avalanche breakdown of a reverse biased p-n junction. This occurs when the electric field at the junction reaches a high enough level to create a strong inversion layer which carries the current. The junction becomes saturated, current rises exponentially and the diode voltage drops as a result. The TVS diode is designed to take advantage of this principle, so that the applied voltage is continually monitored and, if a threshold voltage is exceeded, the device conducts to ground so that the voltage is protected from damage.

The SM15T15CA has a number of features which make it suitable for protecting electronic components from transient voltage spikes including its low capacitance (1pF maximum), low on resistance (0.6 Ω typical) and fast response time (less than one nanosecond). It is also relatively robust and can withstand surges up to 400 watts without damage. In addition, the SM15T15CA is compliant with all relevant standards for transient protection, including UL and CSA standards.

In conclusion, the SM15T15CA is a robust and efficient transient voltage protector suitable for use in a wide range of electronic circuits. It offers fast response times, low capacitance, low on-resistance and is compliant with relevant standards. Thanks to its rapid response time and high surge current capability, it is suitable for protecting sensitive components from voltage spikes and other transient events.

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