V47RA8X2749 Circuit Protection

Varistor Voltage (Typ):	47V
Package / Case:	Radial, Box
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 125°C (TA)
Capacitance @ Frequency:	800pF @ 1MHz
Number of Circuits:	1
Energy:	1.8J
Current - Surge:	250A
Varistor Voltage (Max):	51.7V
Series:	RA
Varistor Voltage (Min):	42.3V
Maximum DC Volts:	38V
Maximum AC Volts:	30V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction to TVS - Varistors, MOVs

A TVS - Transient Voltage Suppressor - is an electrical component that includes a circuit protection device, such as a voltage-regulating device, MOV – Metal Oxide Varistor – or Zener diode, designed to protect sensitive electrical equipment from high voltage spikes. The V47RA8X2749 device exemplifies this protection technology.

V47RA8X2749 application field and working principle

The V47RA8X2749 is a low capacitance, high surge rated device, suitable for ESD and surge protection in high speed (USB 2.0, 3.0 or higher) interfaces. These devices are able to withstand high surge currents and protect connected components from voltage exceeding the system’s voltage rating. V47RA8X2749 components have two metal oxide layers, usually a Zener diode structure, connected in series. This connection allows for lightning fast response times to voltage spikes and heavy surges. The device can also provide circuit protection from multiple sources of electrical disturbances. The device includes two ports: one for items such as wiring, cables and electronic modules that may be exposed to electrical disturbances from power line or other sources, and another that is used to power the device. The first port is equipped with anti-parallel varistors and Zener diodes connected in series. This series connection provides improved stability and robustness over single components. The varistor is the primary voltage protection element and offers voltage clamping and surge protection. The varistor is designed to input a current when the voltage reaches a certain predetermined level. This current flows through the Zener diode and reduces the voltage at the second port of the device. The second port, also referred to as the input port, then allows for the connection of a power supply to the device, which continues to provide the voltage maintenance or regulation to the device. Additionally, the V47RA8X2749 includes internal ESD protection circuitry, as well as an output channel switch and near-zero leakage current of less than 0.001μA. This switch offers improved protection from undesirable current flow that could cause electrical damage. The device also provides reverse biasing protection, meaning it can prevent damage when the device is exposed to externally generated voltages beyond its rated limits. In sum, the V47RA8X2749 is an advanced protection device ideal for equipment exposed to high or hazardous voltages. The device provides circuit protection from ESD and surge protection, voltage maintenance or regulation, internal ESD protection circuitry, output channel switch, and reverse biasing protection.

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