B72205S0301K211 Circuit Protection

Varistor Voltage (Typ):	470V
Package / Case:	Disc 5mm
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 105°C (TA)
Capacitance @ Frequency:	55pF @ 1kHz
Number of Circuits:	1
Energy:	9.6J
Current - Surge:	400A
Varistor Voltage (Max):	517V
Series:	StandarD
Varistor Voltage (Min):	423V
Maximum DC Volts:	385V
Maximum AC Volts:	300V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Transient Voltage Suppressors - Varistors, MOVs

Transient voltage suppressors (TVS) are protective devices designed to protect components and systems from damage caused by sudden increases in voltage that can occur from electrical stress. These suppressors come in a range of shapes and sizes and include varistors and metal oxide varistors (MOVs). One such device is the B72205S0301K211, which is a non-polarized overvoltage protection varistor.

Application Field

The B72205S0301K211 is used to protect components and systems from transient overvoltages over the range of DC to 1MHz. It can be used to protect automotive electronics, power supplies, industrial, commercial and consumer equipment, computers, data networks, telecom, audio, audio/video, and HVAC systems. Additionally, it can also be used in sensitive components, low-cost secondary power lines, and power rail coupling applications. It is especially suitable for applications where long-term high temperature operation is necessary.

Working Principle

The B72205S0301K211 is designed to protect equipment from high-voltage transients, such as those that might be caused by lightning strikes, power spikes, electrostatic discharges, etc. It works by providing a low impedance path to ground in the event of a transient, thus dissipating the excess energy of the transient and limiting the increase in voltage.The varistor\'s basic operating principle is based upon the voltage divider rule. For this specific device, the breakdown voltage is 211 volts. When the voltage across the device exceeds 211 volts, the device begins to conduct. At this point, the varistor begins to act as a low resistance path to ground and will absorb the transient energy. The energy is then dissipated as heat within the varistor, and the voltage across the device will be limited to a safe level.

Conclusion

The B72205S0301K211 is a non-polarized overvoltage protection varistor, designed to protect equipment from high-voltage transients. It can be used in a range of applications, from automotive electronics to power supplies, industrial and consumer equipment, and data networks. Its basic operating principle is based on the voltage divider rule, whereby it serves as a low-impedance path to ground in the event of a transient, thus dissipating the excess energy and limiting the voltage increase.

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