The SM8S40 is a Transient Voltage Suppressor (TVS) diode manufactured by Vishay. It is designed to protect sensitive electronic equipment from voltage transients induced by lightning, inductive load switching, and electrostatic discharge (ESD). This surface-mount device offers a robust and reliable solution for overvoltage protection in a variety of applications.

Applications:

• Protection of I/O Interfaces
• AC and DC Power Supply Protection
• Industrial Equipment
• Telecommunication Systems
• Automotive Electronics

Features:

• Surface Mount DO-218AB Package
• Glass passivated junction
• Excellent clamping capability
• Low incremental surge resistance
• Typical IR less than 1 μA above 12V
• Fast response time: typically less than 1.0 ps from 0 V to VBR minimum
• High temperature soldering guaranteed: 260°C/10 seconds at terminals
• Plastic package has underwriters laboratory flammability classification 94 V-0

Benefits:

• Enhanced System Reliability: Protects sensitive components from damaging voltage transients, ensuring long-term system performance.
• Simplified Design: The surface-mount package and excellent clamping capability simplify circuit design and reduce board space requirements.
• Fast Response Time: Reacts quickly to transient events, providing effective protection against fast-rising surges.
• High Surge Capability: Withstands high surge currents, ensuring reliable protection in harsh environments.
• Compliance: Meets industry standards for flammability and soldering, ensuring product safety and reliability.

The SM8S40 has a stand-off voltage of 40V. This means that the TVS diode will not conduct under normal operating conditions until the voltage exceeds 40V. When a transient voltage exceeds this level, the diode rapidly clamps the voltage to a safe level, protecting downstream components.

Electrical Characteristics: The SM8S40 features a peak pulse power dissipation of 6600W at 10/1000μs waveform, a reverse stand-off voltage of 40V, and a breakdown voltage range of 44.4V to 49.4V. It has a maximum clamping voltage of 64.5V at a peak pulse current of 10.2A.