SMF9V0A-HM3-18 Circuit Protection

Voltage - Clamping (Max) @ Ipp:	15.4V
Supplier Device Package:	SMF (DO-219AB)
Package / Case:	DO-219AB
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 175°C (TJ)
Capacitance @ Frequency:	640pF @ 1MHz
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	200W
Current - Peak Pulse (10/1000µs):	13.5A
Series:	Automotive, AEC-Q101
Voltage - Breakdown (Min):	10V
Voltage - Reverse Standoff (Typ):	9V
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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The SMF9V0A-HM3-18 Application Field and Working Principle

TVS – Diodes

Transient voltage suppressors (TVS) are protection devices which, when placed in an electrical circuit, can limit the voltage across devices to a safe operating level. TVS diodes are an example of a type of TVS that uses avalanche breakdown behavior and PN junction technology to provide overvoltage protection in a variety of applications. The SMF9V0A-HM3-18 is a unidirectional symmetry type of TVS diode which is used to protect against high-intensity, short-term voltage and current transients. This article will discuss the application fields and working principle of the SMF9V0A-HM3-18 device.

Application Fields

The SMF9V0A-HM3-18 has a working peak pulse power of 900 Watts and is ideal for transient voltage suppression in a variety of electrical circuits. It can be used in the automotive, telecommunications, data storage, aerospace, and other industries, including electrical power systems and pulsed lasers. In addition, it can be used with devices such as microcontrollers, FPGAs, chip components, and data networks.

Working Principle

The SMF9V0A-HM3-18 uses PN junction technology to divide the unbounded voltage into two halves and then converts the excess voltage into current. A positive voltage is applied to the anode and a negative to the cathode. When the current exceeds the reverse breakdown voltage, it activates avalanche breakdown, releasing the excess energy. This reduces the amount of voltage available for further breakdown activity and restores normal operation.The SMF9V0A-HM3-18 is designed to protect against short-term voltage and current transients. When the voltage at the anode of the device passes a certain threshold, a reverse leakage current will begin to flow. This current flow will increase until the device reaches its rated voltage tolerance. At this point, excess energy is released and the voltage drops back to its normal level, allowing for normal operation again.

Conclusion

The SMF9V0A-HM3-18 is an unidirectional symmetry type of TVS diode which can be used to protect against high-intensity, short-term voltage and current transients. It has a working peak pulse power of 900W and can be used in a variety of applications, including automotive, telecommunications, data storage, aerospace, electrical power systems, pulsed lasers, and more. The device uses PN junction technology and exploits avalanche breakdown behavior to reduce excess voltage. This allows for the device to restore normal operation after a pulse or surge has been detected.

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