SMB8J17CAHE3/5B

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Definition and Application Field of SMB8J17CAHE3/5B

TVS - Diodes is an important type of overvoltage protection device for circuit protection industry. TVS also known as Transient Voltage Suppressor (TVS) is a two-terminal type of device that can suppress or limit the surges in high voltage by converting the excessive energy level generated from the transient pulse to thermal energy. SMB8J17CAHE3/5B is a part of TVS - Diodes that are provided by manufacturers to provide high level of protection to circuits and devices.

SMB8J17CAHE3/5B is a bidirectional, fast-acting surface mount TVS with 5.0 V working voltage, 41.6 V peak pulse power capability at 10/1000 microseconds and a 6000 W peak pulse current capability at 10/1000 microseconds. Its maximum unidirectional clamping voltage is 7.5 V with very low capacitance of 8.2 pF and forward voltage of 0.71 V. When reversibly operating, this unidirectional device will conduct high levels of current and maintain low dynamic impedance.

SMB8J17CAHE3/5B is constructed with two SOT-23 packages, so it can fits in a small space for a variety of applications. It is suitable to replace SOD-123 and SMA packages, The major application areas of SMB8J17CAHE3/5B are protection of sensitive devices from over-voltage transients found in automotive, computer, electronic communication, consumer, power supply, and industrial control industries. It can be used in low capacitance applications also, such as for ESD, EMI/RFI line filter, Ethernet, digital communication line protection etc.

Working Principle of SMB8J17CAHE3/5B

SMB8J17CAHE3/5B works as bidirectional transient voltage suppressing diode. This means whatever the type of over voltage pulse either leaded to peak clamping voltage or non-linear clamping voltage, SMB8J17CAHE3/5B reacts on it. It works when a transient voltage pulse appears due to a change in capacitance or inductance of a circuit. The transient voltage generates an excess current, which is equal to the voltage divided by the series resistance. The voltage across the SMB8J17CAHE3/5B appears when this excess current reaches the diode’s maximum power handling capability determined by the breakdown voltage.

When the current exceeds the power limit, the avalanche breakdown takes place and the current is diverted, clamping the voltage across SMB8J17CAHE3/5B. The SMB8J17CAHE3/5B allows current to flow while protecting the circuit from excessive voltage transients. It also has an internal temperature sensing device that will establish when the thermal dissipation device will become active in order to keep the diode from exceeding usual temperature levels.

Conclusion

SMB8J17CAHE3/5B is a bidirectional, fast-acting surface mount TVS with 5.0V working voltage, 41.6V peak pulse capability at 10/1000μs and a 6000W peak pulse current capability at 10/1000μs. It is mainly used in automotive, computer, electronic communication, consumer, power supply, and industrial control industries. Its working principle can be simply described as when a transient voltage pulse appears due to a change in capacitance or inductance of a circuit or if the current exceeds the power limit, the avalanche breakdown takes place and the current is diverted, clamping the voltage across SMB8J17CAHE3/5B.

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