Voltage - Clamping (Max) @ Ipp:	113V
Supplier Device Package:	DO-214AB (SMCJ)
Package / Case:	DO-214AB, SMC
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	Automotive
Power Line Protection:	No
Power - Peak Pulse:	3000W (3kW)
Current - Peak Pulse (10/1000µs):	26.5A
Series:	Automotive, AEC-Q101, TransZorb®
Voltage - Breakdown (Min):	77.8V
Voltage - Reverse Standoff (Typ):	70V
Bidirectional 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: SMC3K70CAHM3/9A Application Field and Working Principle

TVS (transient voltage suppression) diodes are an integral part of the power distribution systems used for many electrical and electronic applications. They protect sensitive components from voltage surges, either from external sources or within the system itself. The SMC3K70CAHM3/9A is a popular TVS Diode manufactured by Semtech. It has a wide variety of uses and provides excellent protection.

Typical Applications

The SMC3K70CAHM3/9A is mainly used in automobiles, consumer electronics, LED lighting, power systems, and general-purpose electronics. It can be used as an on-board protection for a variety of electronic circuits including microcontrollers and FPGAs. As a bidirectional device, it can displace the need for separate reverse and forward protection circuits. It is also suitable for computer ports, to protect them from electrostatic discharge (ESD) and other power related issues.

High Levels of Protection

The SMC3K70CAHM3/9A can withstand ultra-high voltages up to 1500W peak pulse power at 10/1000 us waveform. The low capacitance and low leakages of this diode enable it to provide high protection against both electrostatic discharge and power surges. It is also highly reliable, as it meets all the environmental requirements applied to automotive applications (AEC-Q101).

Working Principle

The basic working principle of the diode is the same as any other type of diodes. When a voltage higher than its breakdown voltage is applied to the SMC3K70CAHM3/9A, a high-speed current will flow through it in the forward direction. This current will then be short-circuited and the voltage across the diode will drop to approximately 0V. This protects any connected components from the excessive voltage levels. The SMC3K70CAHM3/9A also has an internal mini-circuit breaker which can be used to protect devices in the event of a short-circuit. This is achieved by the diode using its high peak current capability to short-circuit its terminals and limits the time and current the device is exposed to.

Conclusion

The SMC3K70CAHM3/9A is a widely used TVS diode with many applications. It provides excellent protection for automotive, LED lighting applications, FPGAs and microcontrollers, as well as personal computers. It can withstand high levels of voltage without failure and has an internal mini-circuit breaker which prevents against short-circuits. Its robust protection capabilities make it a great choice for many different uses.

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