The SM5S18 is a transient voltage suppressor (TVS) diode manufactured by Vishay. It is designed to protect sensitive electronic components from voltage transients induced by lightning, electrostatic discharge (ESD), inductive switching, and other transient voltage events. This device is part of the SM5S series, which offers a range of voltage ratings and power dissipation capabilities.

Applications

• Protection of I/O Interfaces
• Overvoltage transient protection in sensitive equipment
• AC and DC power line protection
• Microprocessor protection
• Signal line protection

Features

• 5000 W peak pulse power capability with a 10/1000 μs waveform, repetition rate (duty cycle): 0.01 %
• Excellent clamping capability
• Low incremental surge resistance
• Typical IR less than 1 μA above 12 V
• Fast response time: typically less than 1.0 ps from 0 V to VBR minimum
• Available in unidirectional and bidirectional versions
• Compliant to RoHS directive 2011/65/EU and in accordance to WEEE 2002/96/EC

Benefits

• Provides robust overvoltage protection, enhancing the reliability of electronic systems.
• Minimizes voltage overshoot during transient events, protecting downstream components.
• Facilitates compliance with industry standards for surge protection.
• Reduces system downtime and maintenance costs associated with voltage-related failures.
• Small package size allows for space-efficient designs.

Additional Details

The SM5S18 has a standoff voltage of 18 V. The clamping voltage at a peak pulse current of 41.7 A is typically around 29.2 V. It is available in an SMC (DO-214AB) package, which is suitable for surface mounting. The device is designed to handle high surge currents, making it suitable for applications where exposure to transient voltage events is a concern. The operating temperature range is typically from -55°C to +150°C.

The unidirectional configuration is typically used for DC circuits, while the bidirectional configuration is more suitable for AC circuits or DC circuits where reverse polarity protection is required. Proper board layout is crucial for optimal performance, and it is recommended to keep trace lengths as short as possible to minimize parasitic inductance.