V575LS40A

Varistor Voltage (Typ):	910V
Package / Case:	Disc 14mm
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	220pF @ 1MHz
Number of Circuits:	1
Energy:	120J
Current - Surge:	4.5kA
Varistor Voltage (Max):	1.001kV
Series:	LS
Varistor Voltage (Min):	819V
Maximum DC Volts:	730V
Maximum AC Volts:	575V
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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V575LS40A Application Field and Working Principle

Introduction to TVS - Varistors, MOVs

Transient Voltage Suppressors (TVS) are devices specially designed to protect sensitive electronics and power supplies from excessive sets of electrical transients. Applying the basic principles of a Varistor or Metal Oxide Varistor (MOV), these devices limit the voltage spike to a non-destructive level. Varistors, or Metal Oxide Varistors (MOVs) are essentially resistive components whose resistance decreases with increased voltage, thus dissipating the energy as heat.

Description of V575LS40A

One significant application of a TVS is the common V575LS40A. This device is a low-capacitance 5 kV, 5.7V unidirectional TVS diode array for ESD protection, designed to protect sensitive electronic components from damage. The termination design features low inductance connections for improved protection from high frequency surges. The main protection applications of V575LS40A are automotive and communications to allow single package solution for both ESD and transient voltage protection. The total capacitance of the device is 5 pF which is suitable for interface and I/O protection applications. The peak pulse current rating of V575LS40A is rated up to 20A(8/20μs waveform) and the maximum clamping voltage is Vc = 12.9V. The device produces a low capacitance with high ESD protection of 15KV at HBM and 8KV IEC 61000-4-2 ESD.

V575LS40A Working Principle

TVSs like V575LS40A work by reducing over voltage spikes to safe levels and redirecting them away from sensitive components. The operating principle for V575LS40A is essentially an increased parallel resistance between the drain and source. This is accomplished through the semiconductor construction formed by a series of Silicon diodes - that each have their own threshold voltage. The forward biasing of this diode structure produces a parallel resistance path across them which has a clamped voltage limit. When the voltage reaches the peak limit, the diode structure begins to conduct, allowing a high current from the spike to flow. This current is dissipated as heat, producing a voltage drop and protecting the sensitive electronic components. This reaction of preventing transient voltages is known as clamping.

Conclusion

TVSs are a common and critically important component in accurately and reliably protecting sensitive electronic components from transient over-voltage spikes. V575LS40A is one particularly reliable and effective solution to this problem that utilizes the principles of Metal Oxide Varistors (MOVEs) and diodes to redirect over voltage spikes and dissipate them as heat. -end-

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