SM15T68CA Circuit Protection

Current - Peak Pulse (10/1000µs):	83A (8/20µs)
Base Part Number:	SM15T
Supplier Device Package:	SMC
Package / Case:	DO-214AB, SMC
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	1500W (1.5kW)
Series:	SM15T, TRANSIL™
Voltage - Clamping (Max) @ Ipp:	121V
Voltage - Breakdown (Min):	64.6V
Voltage - Reverse Standoff (Typ):	58.1V
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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Introduction

SM15T68CA is an automotive-grade, low-capacitance, bidirectional, ESD-protected TVS diode. It offers 15V reverse breakdown voltage and 8A surge current, thus highly suitable for automotive applications. This device is RoHS-compliant and is available in SOD-323, SOD-882 (1.45 x 1.95mm package size) and CLP-6 (2.2 x 2.5mm). It also provides excellent protection to sensitive ICs against excessive current in short-circuit conditions.

Applications

SM15T68CA has a wide range of applications such as:

• Automotive electronics and electrical systems, including starter motors.
• Industrial equipment and applications.
• Consumer electronics.
• Backlighting.
• Power supply systems.
• Wireless communication systems.

Working Principle

In general, a TVS diode works in conjunction with a normal diode to protect sensitive electronics against over-voltages when an electrostatic discharge (ESD) or voltage transients occurs. It is also able to reduce current spikes and voltage transients in the circuit. SM15T68CA TVS diode is designed with a breakdown voltage of 15V and a low clamping voltage. When a surge occurs, the normal diode becomes forward biased and the current will pass through it. When the current level reaches the breakover voltage of the device, the TVS diode will then be triggered to further clamp the current. This will reduce the voltage level in the circuit and protect the following electronics.

Conclusion

The SM15T68CA TVS diode is a good choice for automotive applications as it is rated to withstand ESD transients up to 8A and 15V reverse breakdown voltage. Its low capacitance makes it suitable for high-speed circuits and low-power devices, such as backlighting, wireless communication systems, etc. The excellent clamping effect can protect the sensitive devices from excessive current and voltage transients. From the above discussion, it is concluded that the SM15T68CA is an excellent choice for automotive, industrial, and consumer applications.

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