SM15T18A Circuit Protection

Series:	SM15T, TRANSIL™
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Zener
Unidirectional Channels:	1
Voltage - Reverse Standoff (Typ):	15.3V
Voltage - Breakdown (Min):	17.1V
Voltage - Clamping (Max) @ Ipp:	32.5V
Current - Peak Pulse (10/1000µs):	308A (8/20µs)
Power - Peak Pulse:	1500W (1.5kW)
Power Line Protection:	No
Applications:	General Purpose
Capacitance @ Frequency:	--
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	DO-214AB, SMC
Supplier Device Package:	SMC
Base Part Number:	SM15T

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SM15T18A TVS - Diodes

TVS-Diodes, or Transient Voltage Suppressor (TVS) Diodes, are an auxiliary component designed to protect electrical equipment by diverting electrical surges away from sensitive components. The SM15T18A is a unidirectional device, designed to protect against overvoltage events such as Electrostatic Discharge (ESD), lightning and other forms of transient energy.

Application Field

The SM15T18A TVS - Diodes are widely used in many applications, such as portable electronics, high speed telecommunications, industrial automation, and medical devices. It is especially useful for protecting low-voltage systems, such as those commonly found in smartphones, tablets, digital cameras, and other small electronic devices.In addition, the SM15T18A is designed to meet the requirements of various safety standards set by international agencies, such as IEC 61000-4-2 Level 4 Human Body Model (HBM), IEC 61000-4-5 Surge immunity and ISO 10605 ESD tests. It provides not only reliable circuit protection, but also compliance with the stringent requirements of these standards.

Working Principle

At its most basic level, the SM15T18A works like any other TVS diode. When the input voltage (either AC or DC) exceeds the breakdown voltage of the diode, it conducts current through its p-n junction and produces a voltage drop. In essence, the diode acts as a switch, diverting energy from the input to the output of the diode.However, what makes the SM15T18A unique is its integrated protection circuitry, which is designed to reduce the peak voltage and current below the destructive threshold of sensitive components. It does this by responding quickly to transients and voltage and current spikes, clamping the voltage and current to safe levels before they can ever reach the sensitive components.In some cases, the SM15T18A is designed to be reverse-biased, meaning that it uses the reverse breakdown voltage of the diode to temporarily increase the voltage and current, allowing the device to handle more severe transients.

Conclusion

The SM15T18A is a versatile and reliable TVS - Diode that is designed to protect sensitive electronics from overvoltage events, such as ESD, lightning, and other sources of transient energy. Its integrated circuitry allows it to quickly respond to transients and voltage and current spikes, safely redirecting energy away from the sensitive components. With its IEC 61000-4-2 Level 4 Human Body Model (HBM) and ISO 10605 ESD compliance, the SM15T18A is an ideal choice for protecting electronic devices in a wide variety of applications.

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