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TVS - Diodes

TVS or Transient Voltage Suppressors are a kind of overvoltage protection elements particularly designed for preventing overvoltage and related problems caused by accidental conditions on electronic devices. They mostly consist of Zener diodes (or avalanche diodes) which can protect electronic devices from various voltage surges and electrical noise. TVS diodes are semiconductor device primarily used to protect data lines from high voltage events and spikes.

The SMDJ43CA-T7 is a Surface Mount TVS diode which is designed to absorb overvoltage transients in RS-485, RS-422, and other differential communication lines. The device is made using a hi-reliable SMDJ technology and offers excellent clamping capabilities. This device is RoHS compliant and is offered in ultra-small form factor packaging.

Application Field of SMDJ43CA-T7

The SMDJ43CA-T7 TVS offers protection for various electronic components from electrical noise and voltage spikes owing to its compact size of 0.400 mm x 0.200mm. This device can be used in various applications such as industrial communication bus, automotive applications, base station, telecommunications and radio. The SMDJ43CA-T7 has a peak power dissipation of 5W and an environment temperature range of -55°C to 125°C. It has a maximum stand-off voltage of 44.2 VDC and can handle maximum peak pulse power of 400W.

Working Principle of SMDJ43CA-T7

The SMDJ43CA-T7 works by using a combination of a Zener diode and an anode resistor as an overvoltage protection element for sensitive circuitry. When instantaneous electrical noise (transient) or voltage surges are present, the Zener diode is triggered and conducts in the forward direction. This brings the voltage down to the safe voltage level determined by the anode resistor. This protects the sensitive components from the over voltage event.

The TVS diode does not have any gate and, therefore, the Zener diode can be triggered by any type of electrical noisy environment. Additionally, the anode resistor acts as a short-circuit protection element to limit the current in case of repetitive overvoltage or electrostatic discharge (ESD) event.

In summary, the SMDJ43CA-T7 is a TVS diode that can be used in any application requiring surge protection from overvoltage events. Its combination of a Zener diode and an anode resistor along with its compact size can provide effective protection to sensitive components from electrical noise and surges from various sources.

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