SM4T12CAY Circuit Protection

Voltage - Clamping (Max) @ Ipp:	21.7V
Supplier Device Package:	SMA (DO-214AC)
Package / Case:	DO-214AC, SMA
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	400W
Current - Peak Pulse (10/1000µs):	106A (8/20µs)
Series:	Automotive, AEC-Q101, SM4TY, TRANSIL™
Voltage - Breakdown (Min):	11.1V
Voltage - Reverse Standoff (Typ):	10V
Bidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction:SM4T12CAY is an advanced Transient Voltage Suppressor (TVS), also known as a transverse voltage suppressor (TVD). It is designed specifically to protect electronics from voltage spikes, transients, and electromagnetic interference (EMI) that could damage equipment or interfere with electronic systems. The SM4T12CAY is a four-pin diode with a 12 V reverse standoff voltage rating. It is available in SOT-23L, SOT-323L, and VSON packages.ApplicationsTVSs are used in a variety of circuits and applications requiring a high level of protection from voltage transients and EMI. The SM4T12CAY is most commonly used in automotive applications, such as ECU protection, motor control, and in-car entertainment, and can be used for over-voltage and line-to-ground protection. The device is designed to be able to handle up to 12 V of ESD protection and to be able to provide circuit protection from high transients. In addition, the SM4T12CAY is often used in communications applications, such as consumer devices and routers, as well as for general industrial applications. It can also provide reliable protection for unprotected inputs or outputs in portable devices, such as smartphones, digital cameras, and tablets. Working Principle: The SM4T12CAY is designed to divert transients and EMI away from sensitive electronic components or circuits, protecting them from potential damage caused by high-voltage spikes. It acts as a sacrificial component, taking the “hit” from a high-voltage transient or EMI and allowing the protected circuit to remain at a safe voltage level. The SM4T12CAY contains special Zener diodes that can dissipate energy and turn it into heat. When working with a reverse voltage above the specified voltage rating, the Zener diodes provide a conducting path for the electricity and protect the circuit. This is done by allowing the electrical current to flow in the forward direction, thus limiting the voltage above the Zener breakdown voltage and providing efficient protection against voltage transients. The SM4T12CAY also incorporates a specially designed guard ring structure, which further enhances the device’s ability to mitigate EMI. The guard ring structure helps to reduce noise and static charges, allowing it to absorb the EMI and protect the circuit from being damaged. Conclusion: The SM4T12CAY is a four-pin diode with a 12 V reverse standoff voltage rating. It is designed to protect electronic components or circuits from voltage transients, ESD, and EMI, making it an ideal choice for use in automotive, communications, and industrial applications. The SM4T12CAY incorporates Zener diodes and a guard ring structure to provide efficient protection from voltage transients and reduce EMI, thus ensuring the reliability of the protected circuitry.

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