SMP18-M3/85A Circuit Protection

Voltage - Clamping (Max) @ Ipp:	32.2V
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
Current - Peak Pulse (10/1000µs):	12.4A
Series:	TransZorb®, eSMP®
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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Introduction

TVS (Transient Voltage Suppressor) diodes are extremely fast semiconductor devices designed to protect sensitive electronic equipment from voltage transients, pulses, and power surges. The SMP18-M3/85A is a surface-mount bi-directional, 12V, 18W, unidirectional active clamp TVS diode array designed for protection of data lines and I/O ports against Electrostatic Discharge (ESD). This device is designed for high-speed and low-capacitance protection against ESD events in automotive, communication, and consumer applications.

Physical Dimensions

The SMP18-M3/85A has a surface-mount package with a compact body size of 3mm X 1.5mm. The SMP18-M3/85A can withstand a high peak power of 18W. Its low leakage current allows it to operate at very low power consumption.

Application Fields and Working Principle

The SMP18-M3/85A is an unidirectional active clamp TVS device designed to protect sensitive electronics in automotive, communication, and consumer applications. The low capacitance and low clamping voltage makes the SMP18-M3/85A ideal for protecting I/O ports against ESD events.When a high-voltage transient voltage appears at the anode, the SMP18-M3/85A diode starts to conduct. The diode capacitance is low, so its capacitance values remain small during high-voltage transient events. The SMP18-M3/85A also incorporates a metal oxide varistor (MOV) to provide additional protection. The MOV reduces the amount of energy the TVS diode absorbs by diverting more of the current away from the diode. This helps to reduce power dissipation in the sensitive devices being protected. The SMP18-M3/85A also features active clamping. This means that the diode can maintain a low clamping voltage when the anode voltage exceeds the device’s breakdown voltage. This helps to reduce the surge energy and prevents any secondary breakdowns that could otherwise occur.

Conclusion

The SMP18-M3/85A is a highly advanced TVS diode array that is designed to protect sensitive electronic equipment against destructive voltage transients and power surges. Its low capacitance and low clamping voltage, along with its active clamping feature, makes it ideal for automotive, communication, and consumer applications. The SMP18-M3/85A is an effective and reliable solution for protecting I/O ports against ESD events.

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