SMAJ120C

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Transient Voltage Suppressors (TVSs) are devices used mainly to protect electronic circuits from unexpected voltage surges. They are fast reacting, and have a precisely defined Clamping Voltage (VC) which greatly reduces peak transient voltages.One such device - the SMAJ 120C - is one of the mainstay protection devices for high power portable electronics such as smartphones, navigation systems, hearing aids, and PDAs.

The SMAJ 120C is a bi-directional, low-capacitance V0R12 (voltage over resistor) diode. It ensures very low levels of leakage current, and unlike other TVSs, the protective diodes are not electrically isolated from each other. This is a significant advantage when dealing with high transient voltages. The SMAJ 120C\'s protection is based on the principle of voltage over resistor (VOR), where the high-speed spark gap mechanism helps reduce the voltage surge by clamping the voltage at the desired level. This ensures that transient voltages are regulated without damaging the adjacent components.

As diodes, the SMAJ 120C can be used in a variety of applications. For example, in power supplies, the devices can be used to clamp the over-voltage due to the ringing of the inverter and thus protect the system from malfunctions. In DC-DC converters, the devices can be used to protect the low-side voltage when the high-side voltage increases. In portable and wearable electronic devices, the devices can be used to protect the device and its components from unexpected voltage surges.

The SMAJ 120C is also well-suited for protecting automotive systems, including fuel pump circuits, injection systems, engine sensors, and antenna systems. The device can also be used in a number of other scenarios, such as surge suppressors for appliances, lightning protection systems, or as protective devices in any high-speed circuit.

The working principle of the SMAJ 120C is relatively simple. The device is designed such that when an over-voltage occurs, the spark gap mechanism rapidly reduces the current, clamping the voltage at a predetermined and safe level. This protects the circuit components from the voltage surge, allowing the circuit to continue to function normally.

In summary, the SMAJ 120C is a robust and reliable VOR12 low-capacitance diode. The device helps protect electronic circuits from over-voltage events, allowing for a wide range of applications in high-power portable, automotive, and other consumer electronic systems. The device\'s fast response and precisely defined voltage clamping make it a particularly effective protection device.

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