TVS - Diodes

SMAJ7.0CAHE3/5A Application Field and Working Principle

TVS-Diodes (Transient Voltage Suppressor Diodes) are a type of semiconductor device that is used to provide overvoltage protection in electronic circuits. It is designed to clamp voltage transients that are caused by power surges, electrostatic discharge (ESD) and other transient voltage sources.

The SMAJ7.0CAHE3/5A is a threshhold voltage triggered semiconductor diode. It has an unloaded bias voltage of 7.0V (105V VBR min) and is capable of absorbing energy up to 8000W (8 J). The device is designed to protect the circuit from damage caused by high-energy spikes within the operating voltage range, typically from 76V to 194V. The device is specified for pulse-widths from 8-20ns, and operations up to 10KHz.

When an over-voltage is applied to the SMAJ7.0CAHE3/5A diode, the diode builds resistance until the applied voltage reaches the breakdown voltage. As soon as this occurs, the diode become conductive, and dissipates the energy of the surge in the form of Joule heating. As the energy is dissipated, the resistance of the diode decreases, allowing the voltage to return back to the original level. The ability of the device to dissipate energy is expressed by the power rating or joules rating of the device. The higher the rating, the greater the amount of energy that the device can dissipate.

The SMAJ7.0CAHE3/5A diode is also specified with a reverse-biasing protection to prevent the diode from becoming permanently conductive, and also to ensure that lasting damage does not occur. This reverse-biasing protection is typically specified by a peak voltage and duration. In some cases, the peak voltage and duration can be specified in compliance with a specific language.

The SMAJ7.0CAHE3/5A diode is suitable for a wide variety of applications. It can provide ESD protection in portable and automotive electronics, it can be used in applications where video or high-speed data signals are present, and it can be used for pulse suppression in test and measurement equipment. The diode is also suitable for providing general protection from EMI, ESD and other transients.

In summary, the SMAJ7.0CAHE3/5A is a voltage transient protection diode designed to protect circuits from over-voltage transients. It is rated with a threshold voltage of 7.0V (105V VBR min), a power rating of 8000W (8J), and reverse biasing protection of a peak voltage and duration. It is suitable for protecting in a variety of applications including portable and automotive electronics, video/high-speed data, and general circuit protection in EMI and ESD applications.