SM4T7V6AY Circuit Protection

Voltage - Clamping (Max) @ Ipp:	14.5V
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):	160A (8/20µs)
Series:	Automotive, AEC-Q101, SM4TY, TRANSIL™
Voltage - Breakdown (Min):	7.2V
Voltage - Reverse Standoff (Typ):	6.5V
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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TVS - Diodes

TVS (transient voltage suppression) diodes are components designed to protect electrical circuits from damage caused by high or transient voltage conditions. This type of diode is usually used to protect electronic circuits from over-voltage and power transients such as lightning strikes, power surges, and electrical noise. The purpose of this article is to explain the application field and working principle of the SM4T7V6AY TVS diode.

Application Field

TVS diodes, such as the SM4T7V6AY, are used in numerous applications ranging from personal computers and telecommunications equipment to automotive electronics and consumer appliances. These devices are typically mounted close to the vulnerable interface points in the circuits they protect to minimize the impedance and allow them to clamp down hard on damaging transients. The SM4T7V6AY is a 600W, 6V diode that is suitable for applications including automotive electronics, computer peripherals and battery chargers.

Working Principle

The SM4T7V6AY is a bidirectional diode with a peak surge current rating of 27A. When an over-voltage event occurs, the diode starts conducting and takes on a voltage drop; this maintains the voltage across the protected interface within the safe operating range. The peak surge current can be specified according to the magnitude and duration of the transient. The clamping voltage is specified in terms of the Peak Pulse Power rating.
The SM4T7V6AY TVS diode is designed to provide protection against transients of both positive and negative polarity. When the diode is connected in circuit, the structure surrounding the junction will start to reduce the space charge region allowing the high current to flow through the junction. At this point, the structure will absorb the energy of the transient and the device will start to recover. The diode will then enter the breakdown region where the current will be limited due to carrier multiplication. The device is designed to reset up to 12 times in succession without impairing the performance.
The SM4T7V6AY is also designed to minimize power dissipation and increase operating temperature range. The junction temperature is monitored by a temperature sensing element and a thermal shutdown circuit is activated at 150°C to protect the diode against overheating. The diode is packaged in an epoxy resin body that provides protection from harsh environmental conditions.
In conclusion, the SM4T7V6AY is a reliable and robust TVS diode suitable for a variety of applications. Its working principle is well understood and its features are widely appreciated for applications such as automotive electronics, PC peripherals, and battery chargers.

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