The 1SMB440A is a transient voltage suppression (TVS) diode manufactured by SUNMATE electronic Co., LTD. It is designed to protect sensitive electronic components from voltage transients induced by lightning, electrostatic discharge (ESD), inductive load switching, and other transient voltage events. This diode is part of the 1SMB series, which is known for its robust surge handling capability and fast response time.

Applications:

• Protection of I/O interfaces in computers and peripherals
• Surge protection for communication lines (e.g., RS-232, RS-485)
• Protection of power supplies from voltage transients
• ESD protection for electronic equipment
• Automotive electronics protection

Features:

• Unidirectional configuration
• Stand-off Voltage: 40V
• Peak Pulse Power: 600W
• Low clamping voltage
• Fast response time
• Excellent clamping capability
• Small SMB (DO-214AA) package
• RoHS compliant

Benefits:

• Protects sensitive electronic components from damage due to voltage transients
• Improves the reliability and longevity of electronic equipment
• Reduces downtime and maintenance costs
• Provides robust surge protection
• Facilitates easy assembly with SMB package
• Complies with environmental regulations

Additional Details:

The 1SMB440A TVS diode operates by clamping the voltage to a safe level when a transient voltage event occurs. When the voltage exceeds the stand-off voltage, the diode rapidly conducts, diverting the surge current away from the protected components. The low clamping voltage ensures that the voltage seen by the protected components remains within their safe operating range.

Technical Specifications:

• Stand-off Voltage (Vrwm): 40V
• Breakdown Voltage (Vbr): 44.4V - 49.1V
• Clamping Voltage (Vc) @ Ipp: 64.8V
• Peak Pulse Current (Ipp): 9.3A
• Peak Pulse Power (Pppm): 600W
• Operating Temperature: -55°C to +150°C

The SUNMATE 1SMB440A TVS diode is a reliable and effective solution for protecting electronic circuits from voltage transients. Its robust surge handling capability, fast response time, and low clamping voltage make it a popular choice for engineers designing sensitive electronic equipment.