SM4T26AY Circuit Protection

Current - Peak Pulse (10/1000µs):	48A (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:	48.3V
Voltage - Breakdown (Min):	24.4V
Voltage - Reverse Standoff (Typ):	22V
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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SM4T26AY Application Field and Working Principle

Introduction to TVS-Diodes

Transient Voltage Suppressors (TVS-Diodes), also referred to as electrostatic discharge (ESD) diodes, are specialized semiconductor devices designed to protect electronic components from transient voltage surges. The SM4T26AY is a particularly robust type of TVS-diode which is used to protect against surges coming from the AC power line and other sources. Like all TVS-Diodes, the SM4T26AY is used to protect against excessive voltage. This protection is accomplished by quickly clamping voltage spikes to a safe level, ensuring that the underlying integrated circuit is not damaged by the transient surge. By quickly clamping voltage spikes, the SM4T26AY also prevents interference signals which otherwise might have interfered with the proper functioning of the circuit. Typical transient voltages include electrical noise and electromagnetic pulse which can also cause damage.

Working Principle of SM4T26AY

The SM4T26AY works by providing a low capacitance, high-frequency AC bypass, ensuring transient voltages are dissipated as part of a current loop to ground. In other words, the SM4T26AY works by redirecting surge currents away from the protected circuit, protecting it from damage. The device works by quickly switching on and off several thousand times a second, clamping the voltage below a defined maximum level. When voltage reaches a certain level, either above or below the safe operating voltage of the protected circuit, the TVS-diode switches on, allowing the current to bypass the circuit and be quickly dissipated.In addition, by dissipating the current it absorbs and protecting the circuit, the SM4T26AY also prevents interference signals which would otherwise affect the circuit’s performance. By doing so, it improves the reliability and performance of the circuit.

SM4T26AY Application Fields

The SM4T26AY is suitable for use in circuits where transient surge currents are present. These applications are generally found in computer and consumer entertainment electronics, as well as automotive, avionics and industrial systems. The SM4T26AY is often used in applications where high levels of protection are required, such as in power supplies, electronic controllers and communication systems. The device also provides effective protection for circuits prone to electrical surges, perfect for systems that require power line noise immunity to function accurately. Overall, the SM4T26AY is a versatile, reliable and robust TVS-diode which can be used in a variety of systems needing protection from surge current and EMF/RFI interference.

Conclusion

The SM4T26AY is a TVS-diode designed to protect circuits from transient voltage surges. Its fast switching times and reliable performance make it ideal for protecting high-sensitivity circuits from transient surges and ESD. By quickly clamping voltage spikes, the device works to improve system reliability and performance as well as prevent interference signals and EMI/RFI. The SM4T26AY is suitable for use in a wide range of electronic circuits, from personal computers and consumer entertainment to automotive, avionics and industrial systems.

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