SMAJ40CA

The SMAJ40CA is a surface mount transient voltage suppressor diode manufactured by Yangjie Electronic Technology. It is designed to protect sensitive electronic circuits from transient overvoltage events by clamping voltage spikes and diverting excess current away from the protected components.

Key Features:

• Transient Voltage Suppression: The SMAJ40CA diode is specifically designed for transient voltage suppression, providing effective protection against voltage surges and spikes caused by electrostatic discharge (ESD), lightning, inductive load switching, and other transient events.
• Avalanche Breakdown Diode: This diode utilizes the avalanche breakdown phenomenon to rapidly transition from a high-resistance state to a low-resistance state when the voltage across it exceeds its rated breakdown voltage, effectively clamping the voltage to a safe level.
• Bidirectional Protection: The diode offers bidirectional transient voltage suppression, meaning it can protect electronic circuits from both positive and negative voltage transients, making it suitable for use in applications where voltage polarity may vary.
• Low Clamping Voltage: With a clamping voltage of 64.5 volts at a peak pulse current of 10 A, the diode limits the voltage across the protected circuit to a safe level, preventing damage to sensitive components.
• Fast Response Time: The diode has a fast response time, typically in the nanosecond range, which ensures rapid activation when subjected to transient voltage events, minimizing the duration of voltage spikes and reducing the risk of damage to downstream components.
• High Surge Current Capability: It can handle surge currents of up to 400 A (8/20 µs waveform), allowing it to effectively dissipate large transient energy pulses while maintaining stable operation.
• Surface Mount Package: Packaged in a compact surface mount SMA (DO-214AC) package, the diode is suitable for automated assembly processes and offers space-saving advantages in modern electronic designs.
• RoHS Compliance: Manufactured with materials that comply with the Restriction of Hazardous Substances (RoHS) directive, ensuring environmental friendliness and regulatory compliance.

Applications:

• Consumer Electronics: Used in smartphones, tablets, laptops, and other consumer electronic devices to protect sensitive integrated circuits (ICs), connectors, and ports from voltage transients induced by ESD and other external sources.
• Telecommunications Equipment: Integrated into telecommunications infrastructure equipment such as routers, switches, and base stations to safeguard sensitive electronic components from voltage surges and lightning-induced transients.
• Industrial Automation: Employed in industrial control systems, PLCs, motor drives, and instrumentation to protect control circuits, sensors, and communication interfaces from transient voltage events in harsh industrial environments.
• Automotive Electronics: Installed in automotive electronic control units (ECUs), powertrain systems, and infotainment systems to provide robust protection against voltage spikes and ESD events caused by vehicle electrical systems and environmental factors.
• Power Supplies: Used in AC/DC and DC/DC power supplies to suppress voltage transients and protect downstream components such as ICs, capacitors, and transformers from damage due to input voltage fluctuations and surges.
• LED Lighting: Incorporated into LED lighting fixtures and drivers to prevent damage to LEDs and associated control circuitry from voltage surges caused by power supply fluctuations and lightning strikes.
• Industrial Equipment: Applied in various industrial equipment and machinery to protect sensitive electronic components, communication interfaces, and sensor circuits from transient voltage events that may occur during operation or external disturbances.