SMP17A-E3/85A

Current - Peak Pulse (10/1000µs):	14.5A
Base Part Number:	SMP*
Supplier Device Package:	DO-220AA (SMP)
Package / Case:	DO-220AA
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	400W
Series:	TransZorb®, eSMP®
Voltage - Clamping (Max) @ Ipp:	27.6V
Voltage - Breakdown (Min):	18.9V
Voltage - Reverse Standoff (Typ):	17V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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SMP17A-E3/85A Application Field and Working Principle

TVS (transient voltage suppression) diodes play an important role in various applications by protecting electronics or electrical equipment from current induction and overvoltage as well as undervoltage. Among them, the SMP17A-E3/85A is a two-electrode device consisting of PN junction which has low capacitance and fast response time. This article is dedicated to discuss the application field and the working principle of SMP17A-E3/85A transient voltage suppressors.

Application Field of SMP17A-E3/85A

SMP17A-E3/85A devices are applicable in a variety of electronic components and systems due to their features.

• It has great surge energy and transient voltage rating , can protect circuits against moderate to large transient voltage spikes.
• It is highly reliable due to its low junction capacitance and fast response time.
• SMP17A-E3/85A has a wide operating temperature range, good thermal stability and a long lifetime.
• Its high surge energy rating make it suitable for high-speed data lines protection.
• It is suitable for protecting radio frequency and high-speed applications.
• Due to its low capacitance, SMP17A-E3/85A devices are excellent for protection of high-frequency, high-speed and high-power applications.

SMP17A-E3/85A devices are widely used in automotive applications, IEC61000-4-5 surge protection, low-voltage telecommunications equipment, medical systems, and industrial systems such as computers and other equipment that require high-speed communication lines for their operation.

Working Principle of SMP17A-E3/85A

The SMP17A-E3/85A is a two-electrode device consisting of a PN junction, which is the most common form of diode construction. When an external voltage is applied to the diode, the p-type material and the n-type material form an electrostatic junction, creating a closed circuit. When the external voltage is higher than the PN junction voltage, the SMP17A-E3/85A device starts to conduct current, allowing the current to flow through it.When a transient voltage spike occurs, electrons from the external source will be able to enter the PN junction and cause an avalanche effect. This will cause an increase in the current flowing through the junction. As the transient voltage is removed, the current will drop. This is the basic working principle of SMP17A-E3/85A transient voltage suppression device. When the transient voltage is above the PN junction voltage level, the SMP17A-E3/85A will clamp the voltage to protect the circuit. The clamping voltage of SMP17A-E3/85A is in the range of 8V to 79V. SMP17A-E3/85A can be used to protect sensitive components of a circuit from damage caused by over-voltage. It protects from pulses that occur in short periods of time, such as lightning storms, faults or switching events that can cause damage to the circuit. The SMP17A-E3/85A can also be used to protect the circuit from induced high-voltage transients, such as from an electrostatic discharge.

Conclusion

SMP17A-E3/85A is an important device for protecting electronic circuits from current induction, overvoltage as well as undervoltage and protecting sensitive components from damage due to high-voltage transients. It has a wide range of applications in automotive, industrial, medical, telecommunications, and other industries. Its working principle involves avalanche effect and clamping voltage which can be clamped to protect the circuit. With its features like reliability, stability, and fast response time, it is a great device for transient voltage suppression.

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