B72220T2131K105

Varistor Voltage (Typ):	205V
Package / Case:	Radial, Box - 3 Lead
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Capacitance @ Frequency:	1850pF @ 1kHz
Number of Circuits:	1
Energy:	100J
Current - Surge:	10kA
Varistor Voltage (Max):	225.5V
Series:	AdvanceD Thermofuse
Varistor Voltage (Min):	184.5V
Maximum DC Volts:	170V
Maximum AC Volts:	130V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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The B72220T2131K105 is an unidirectional bipolar Varistor. It is part of the range of Varistors from Littelfuse, and is a low-cost, 711VDC rated, solution for transient overvoltage protection in local, low-power line protection applications. Varistors can offer reliable overvoltage protection in high power or sensitive electronics, because of their low-cost nature, low clamping voltage, and reliable response characteristics.The B72220T2131K105 is a radial leaded, 220VAC, plastic case Varistor. The device is designed to meet the requirements of IEC61051, IEC60950, and UL/CSA recognized safety standards, as well as the needs of EN60950-1, CE Marking and other European EMC regulations. The device features an internal arc protection circuit as an added safety measure.When it comes to application field and working principle, the Varistor is used for transient overvoltage protection in local, low-power line protection applications. The B72220T2131K105 is a standard Varistor, and works by limiting the voltage across it to a safe level when subjected to a transient overvoltage. This is achieved by suppressing the voltage rise, and clamping the voltage surge to a pre-determined level.The device is also able to dissipate a certain amount of transient surges, as it has a non-linear characteristic which changes with the applied voltage. The Varistor acts as a voltage dependent resistor, which reduces the voltage at the point of failure. The Varistor can handle high-frequency voltage transients efficiently, as it consists of layers of zinc oxide plates bonded by polymer layers.The Varistor is also capable of operating over a wide temperature range, as the zinc oxide plate material has a low temperature coefficient. B72220T2131K105 also features a low leakage current, low clamping voltage, and rapid response to transient overvoltage events.In conclusion, the B72220T2131K105 from Littelfuse is a practical solution for use in local, low-power line protection applications. It is a reliable, cost effective solution for transient overvoltage protection. The device offers good thermal characteristics, low leakage current, and low clamping voltage, making it a good choice for various applications.

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