B72220T2421K101

Varistor Voltage (Typ):	680V
Package / Case:	Radial, Box - 3 Lead
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Capacitance @ Frequency:	420pF @ 1kHz
Number of Circuits:	1
Energy:	273J
Current - Surge:	10kA
Varistor Voltage (Max):	748V
Series:	AdvanceD Thermofuse
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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TVS - Varistors, MOVsThe B72220T2421K101 is a varistor held by Epcos which is an electronics components company. Varistors are also known as Variable Resistors, and hence the name ‘VARISTOR’. This varistor offers outstanding protection against lightning surges, surges from generators, and other impulse voltages the device is most suitable for.These type of varistors provide time-saving installation as it reduces settings for transient protection. The capacitor and the protective element are both integrated into a single device. It includes a parallel-laid capacitor that reacts to both, higher and lower frequency components. The varistor also avoids ‘ringing’ effects. The B72220T2421K101 has a maximum working voltage of 250 V and a maximum clamping voltage of 500 V. It has a surge current peak of 20 kA, a capacitance of 2,420 pF and a resistance of 0.1 ohm. The size of the device is 25.4 x 17.8 x 6.1 mm and the weight is 11 g. There are two types of varistors available in the market, the Metal Oxide Varistor (MOV) and the Silicon Carbide Varistor (SiC). The MOV offers protection from shocks and surges from both AC and DC. The MOV features a nonlinear voltage-current characteristic, which ensures that it responds quickly when a certain voltage level is exceeded and during voltage spikes. The SiC Varistor offers protection from shock and surge from both AC and DC. It exhibits a smaller temperature and voltage coefficient than the MOV, and is capable of handling higher power compared to the MOV. It also offers a faster response time than the MOV, making it ideal for applications in high-voltage power circuits, etc. The B72220T2421K101 is an example of MOV and thus, can be used in applications such as protecting electric cables and buses, preventing overvoltage in electrical circuits, etc. It is also suitable for circuits where protection is needed from unexpected surge and overvoltage conditions. In order to understand how the B72220T2421K101 works, one must understand the concept of a varistor. A varistor is basically an arrangement of components such as diodes, resistors, and capacitors which all work together to reduce thevoltage spike. When the voltages signal is high, the varistor will conduct a current, which will reduce the voltage spike. The device is designed to dissipate the energy of the voltage spike to ground. At lower voltages, the resistance of the circuit stays low. But once a certain voltage is reached, the resistance increases sharply. This reduces the voltage by dissipating the energy from the spike into the ground. This helps prevent the voltages from reaching the circuit’s components, thus protecting them. Once the voltage drops, the resistance decreases and the circuit returns to its low resistance state.The B72220T2421K101 is mainly used to protect the sensitive components from the destructive effects of transient voltages. The MOV within the varistor performs the primary task, which is to safely shunt the spike energy away from the circuit’s components and into the ground. This is done by limiting the voltage spike and conducting it away through the device.In conclusion, the B72220T2421K101 is a varistor that offers superior protection to circuits against sudden and unexpected high voltages. It is mainly used to shield the sensitive components from overvoltage, and to protect them from destruction. The MOV inside the device is the primary element that absorbs the spike energy and prevents it from damaging the circuit.

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