SMBJ18A-E3/52

The SMBJ18A-E3/52 is a transient voltage suppressor (TVS) diode manufactured by Vishay, designed to protect sensitive electronic components from voltage spikes and transients. Here’s a detailed description of its features and specifications:

General Overview:

• Type: Transient Voltage Suppressor (TVS) Diode
• Package: SMB (DO-214AA) package, which is a surface-mount device (SMD) that allows for easy integration into circuit boards.
• Polarity: Unidirectional, meaning it is designed to conduct current in one direction, making it suitable for protecting DC applications.

Electrical Characteristics:

• Reverse Stand-Off Voltage (V_R): 18V, which is the maximum voltage that can be applied across the device without it conducting.
• Clamping Voltage (V_C): Typically around 28V at a specified peak pulse current, indicating the maximum voltage the device will allow during a transient event.
• Peak Power Dissipation: Capable of handling a peak power of 600W for a duration of 8/20 µs, which is critical for absorbing high-energy transients.
• Breakdown Voltage (V_BR): The breakdown voltage is typically around 20.2V, which is the voltage at which the diode begins to conduct significantly.

Thermal Characteristics:

• Operating Temperature Range: -55°C to +150°C, allowing it to function in a wide range of environmental conditions.
• Storage Temperature Range: -55°C to +150°C, ensuring reliability in various applications.

Mechanical Characteristics:

• Body Dimensions: The SMB package typically measures approximately 5.2mm x 6.4mm x 2.5mm, making it compact and suitable for space-constrained applications.
• Weight: Lightweight, which is beneficial for portable electronic devices.

Applications:

The SMBJ18A-E3/52 is commonly used in:

• Consumer Electronics: To protect sensitive components in devices like smartphones, tablets, and laptops.
• Automotive Electronics: For safeguarding circuits against voltage spikes from inductive loads.
• Telecommunications: To protect data lines and communication equipment from surges.
• Industrial Equipment: In machinery and control systems where voltage transients can occur.

Compliance and Standards:

• RoHS Compliant: The device is compliant with the Restriction of Hazardous Substances directive, ensuring it is environmentally friendly.
• AEC-Q101 Qualified: This indicates that the component meets automotive reliability standards, making it suitable for automotive applications.

Conclusion:

The SMBJ18A-E3/52 from Vishay is a robust and reliable transient voltage suppressor diode, ideal for protecting sensitive electronic components from voltage spikes in a variety of applications. Its combination of high power handling, wide operating temperature range, and compact size makes it a versatile choice for engineers designing protective circuits.