SM4T30AY Circuit Protection

Current - Peak Pulse (10/1000µs):	43A (8/20µs)
Base Part Number:	SM4T
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
Series:	Automotive, AEC-Q101, SM4TY, TRANSIL™
Voltage - Clamping (Max) @ Ipp:	53.5V
Voltage - Breakdown (Min):	28.9V
Voltage - Reverse Standoff (Typ):	26V
Unidirectional 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 to SM4T30AY

SM4T30AY is a uni-polar, bidirectional TVS diode from Littelfuse, an electrical component manufacturer. Specifically, the SM4T30AY is designed to protect sensitive components in electronic systems against transient voltage spikes, ensuring the components remain physically intact during operation. It\'s voltage is rated at 12V with a clamping voltage of 13.4V. The device itself is found in a variety of applications including automotive, medical, and industrial applications.

Features and Characteristics

The SM4T30AY features a standard SMD configuration, allowing for easy surface mounting on the PCB. It consists of a silicon body with a metal anode and cathode combined with a thin silicon film. The diode has a very low leakage current, which is important in high-sensitivity applications. Additionally, the SM4T30AY has a low capacitance and is able to operate over a wide temperature range.

SM4T30AY Application Fields and Working Principle

The SM4T30AY is typically used in automotive, medical, and industrial applications to help protect against transient voltage spikes, ensuring the components remain physically intact during operation. The diode works by clamping off any excessive voltage above its rated limit. When the voltage level rises above the specified rating, the diode turns on and immediately begins to siphon off the extra voltage, bringing the voltage level back to the specified amount.The device itself is a bidirectional diode, meaning that it can be placed in either forward or reverse directions, depending on the application. This allows for a variety of configurations to be used in different applications. For example, in automotive applications, the diode can be used to protect against transient voltage surges that occur when components become electrically connected or disconnected.

Conclusion

The SM4T30AY is a uni-polar, bidirectional TVS diode from Littelfuse designed specifically to protect against transient voltage spikes. It features a standard SMD configuration, low leakage current, low capacitance, and wide operating temperature range. The diode is typically used in automotive, medical, and industrial applications and works by clamping off any voltage above its rated limit. Additionally, the device is bidirectional, meaning it can be used in a variety of configurations to suit different applications.

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