SA18A

Voltage - Clamping (Max) @ Ipp:	29.2V
Supplier Device Package:	DO-204AC (DO-15)
Package / Case:	DO-204AC, DO-15, Axial
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 175°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	500W
Current - Peak Pulse (10/1000µs):	17.5A
Series:	SA
Voltage - Breakdown (Min):	20V
Voltage - Reverse Standoff (Typ):	18V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Diodes: SA18A application field and working principle

TVS - Diodes, or Transient Voltage Suppression Diodes, are semiconductor protection devices used to protect electronic circuits from transient (very short duration) over-voltage events. SA18A is one of the most commonly used TVS diodes. In this article, we will discuss its application field and working principle.

Application field of SA18A

SA18A is a bi-directional unidirectional TVS Diode featuring excellent clamping capability. It can be used in multiple applications such as portable device, computer peripherals, automotive, aerospace and consumer electronics. SA18A can effectively protect the electrical device from damage when the incoming voltage exceeds the maximum range of the device due to over-voltage or electrostatic discharge (ESD). It also provides excellent transient over-voltage protection. SA18A is used for clamping the over-voltage event by dissipating large amount of power to limit the voltage peak. This helps to protect the device from destruction due to over-voltage.

Working principle of SA18A

SA18A operates on the principle of breakdown voltage. It is a unidirectional diode with a breakdown voltage typically in the range of 6volts to 12 volts. When the voltage across the diode exceeds the breakdown voltage, the diode will stop conducting. This is known as clamping the over-voltage event. As the voltage continues to rise, the current through the diode will increase further. As a result, more power will be dissipated. The high current flow creates a high thermal dissipation, which is essential to limit the voltage peak and protect the device from damage. When the voltage drops below the breakdown voltage of the diode, the diode resumes its low-resistance state and no further current flows. The device will now be able to continue its regular operation.

Conclusion

SA18A is an excellent TVS diode that can provide excellent protection from transient over-voltage events. It can be used in various applications such as portable devices, computer peripherals, automotive, aerospace and consumer electronics. The SA18A diode operates by clamping the over-voltage event and dissipating large amount of power to limit the voltage peak. This helps to protect the device from destruction due to over-voltage.

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