V420LC7PX2855 Circuit Protection

Varistor Voltage (Typ):	680V
Package / Case:	Disc 7mm
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	55pF @ 1MHz
Number of Circuits:	1
Energy:	30J
Current - Surge:	1.2kA
Varistor Voltage (Max):	748V
Series:	LC
Varistor Voltage (Min):	612V
Maximum DC Volts:	560V
Maximum AC Volts:	420V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction to V420LC7PX2855

The V420LC7PX2855 is the latest, high-performance TVS (Transient Voltage Suppressor) and MOV (Metal-Oxide Varistor) device from STMicroelectronics. STMicroelectronics is a leading global supplier of advanced semiconductor products, and the V420LC7PX2855 is just one of their many products specifically designed for over voltage protection applications. This device is ideal for providing reliable protection from over voltage events in all types of applications, including automotive, consumer, and industrial.

Application Fields

The V420LC7PX2855 has many application fields, due to its high-performance TVS and MOV capabilities. In Automotive applications, it can be used to protect ECUs (Engine Control Unit), including fuel injection, powertrain control, and miniature sensors, as well as other automotive electronic systems such as starter motors and headlights. In Consumer applications, the V420LC7PX2855 can be used to protect small AC/DC converters, as well as other consumer electronics like digital TVs and home theater systems.Industrial applications include single power supplies for automation equipment, PLCs (Programmable Logic Controllers), and industrial PCs.

Working Principle

The V420LC7PX2855 is a “dual layer” protection device. It combines an avalanche-style transient voltage suppressor with a metal-oxide varistor (MOV). The TVS portion is designed to protect a circuit from fast transients, while the MOV portion is designed to reduce the effect of conducted electrical noise on the power supply voltage.When the device experiences an over voltage event, the avalanche-style TVS quickly reduces any over voltage to a safe level. This is accomplished by providing a high clamping voltage and low “on-state” resistance. The MOV portion of the device then “clamps” the voltage to a safe level by reducing any overvoltage to a safe level. This is accomplished by providing a lower clamping voltage that slowly decreases until the overvoltage is reduced.The V420LC7PX2855 also has protection against reverse-polarity situations and over-current situations. The over-current detection is activated when the current is too large and the device shuts off the electrical circuit, then resetting once the fault is cleared.The V420LC7PX2855 is designed to operate over a wide range of temperatures, from -55°C to +125°C. This makes it ideal for applications in extreme environment conditions.

Conclusion

In conclusion, the V420LC7PX2855 is an advanced dual layer protection device designed for use in Automotive, Consumer, and Industrial applications. It provides a safe solution for protection from over voltage events and reverse-polarity situations. The TVS and MOV layers ensure that any over-voltage is quickly and safely reduced to a safe voltage level. Additionally, the device is designed to operate over a wide range of temperature conditions, making it ideal for application in extreme environment conditions.

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