SMBJ15CA Detailed explanation of pin function specifications and circuit principle instructions

The model number "SMBJ15CA" refers to a surface mount bidirectional transient voltage suppression ( TVS ) diode designed for protecting sensitive electronics from voltage spikes, such as electrostatic discharge (ESD) or lightning surges. This component is produced by Vishay, a well-known manufacturer of discrete semiconductors.

Package and Pin Configuration

The SMBJ15CA is packaged in a DO-214AA (SMB) form factor, a commonly used package type for TVS diodes. The DO-214AA package typically has 3 pins, corresponding to:

Pin 1 (Cathode): The cathode pin is connected to the negative side of the transient protection circuit. Pin 2 (Anode): The anode pin is connected to the positive side of the circuit. Pin 3 (Cathode): This is another cathode pin (in a bidirectional diode configuration), used for a second cathode connection in the protection circuit.

Pin Function Explanation in Detail

Pin Number Pin Function Description Pin 1 Cathode (C) The cathode side of the TVS diode, which is connected to the negative rail of the circuit. It conducts current to clamp the voltage to a safe level during transient events. Pin 2 Anode (A) The anode side of the TVS diode, connected to the positive rail of the circuit. This pin helps direct the current during a transient surge towards the TVS diode. Pin 3 Cathode (C) Another cathode pin that functions similarly to Pin 1. Both cathode pins are available for flexible circuit design, providing added protection.

Circuit Principle and Application

The SMBJ15CA diode is specifically designed to protect electronic components from transient voltage spikes. It operates by clamping the voltage to a safe threshold whenever a surge is detected. When a voltage transient exceeds the diode’s clamping threshold, the diode conducts and shunts the excess energy away from the sensitive circuit, preventing damage.

Bidirectional Operation: The SMBJ15CA is bidirectional, meaning it provides protection against both positive and negative voltage spikes. This is crucial for circuits that operate with AC signals or mixed-polarity voltages. Clamping Voltage: The diode clamps at a specified voltage to protect downstream components. For the SMBJ15CA, this voltage is 15V (working voltage of the device). Power Dissipation: The power dissipation is managed through its high-energy absorption capacity, ensuring that transients can be absorbed without damaging the diode.

FAQ for SMBJ15CA

Here are 20 frequently asked questions (FAQ) related to the SMBJ15CA:

What is the function of the SMBJ15CA TVS diode? The SMBJ15CA is designed to protect circuits from voltage spikes by clamping excess voltage to a safe level.

What is the voltage rating of the SMBJ15CA diode? The SMBJ15CA is rated for a clamping voltage of 15V.

What package does the SMBJ15CA come in? The SMBJ15CA comes in a DO-214AA surface mount package.

How many pins does the SMBJ15CA have? The SMBJ15CA has 3 pins (two cathode pins and one anode pin).

Can the SMBJ15CA protect both positive and negative voltage spikes? Yes, the SMBJ15CA is a bidirectional TVS diode, providing protection against both positive and negative voltage transients.

What is the maximum working voltage of the SMBJ15CA? The SMBJ15CA has a maximum working voltage of 15V.

What is the peak pulse power rating of the SMBJ15CA? The peak pulse power rating for the SMBJ15CA is 400W (for an 8/20μs waveform).

What type of protection does the SMBJ15CA offer? The SMBJ15CA provides transient voltage suppression to protect sensitive electronic circuits from surges.

What is the current handling capability of the SMBJ15CA? The SMBJ15CA is designed to handle up to 8A of surge current (for an 8/20μs waveform).

Can the SMBJ15CA be used in high-speed circuits? Yes, the SMBJ15CA has a fast response time, making it suitable for high-speed circuit protection.

What is the breakdown voltage of the SMBJ15CA? The breakdown voltage for the SMBJ15CA is typically 15.7V.

Is the SMBJ15CA suitable for ESD protection? Yes, the SMBJ15CA is ideal for electrostatic discharge (ESD) protection in electronic devices.

What is the typical capacitance of the SMBJ15CA? The typical capacitance for the SMBJ15CA is approximately 100pF at 0V.

How should the SMBJ15CA be mounted in a circuit? The SMBJ15CA should be mounted in a surface-mount configuration on the PCB, with its anode and cathode pins properly aligned to the circuit’s positive and negative rails.

What is the operating temperature range of the SMBJ15CA? The SMBJ15CA operates within a temperature range of -55°C to +150°C.

Is the SMBJ15CA RoHS-compliant? Yes, the SMBJ15CA is RoHS-compliant, meaning it is free from hazardous materials.

Can the SMBJ15CA be used in automotive applications? Yes, the SMBJ15CA can be used in automotive applications where transient voltage protection is needed.

What is the reverse leakage current of the SMBJ15CA? The reverse leakage current is typically less than 1μA at 15V.

What is the energy absorption capacity of the SMBJ15CA? The SMBJ15CA has a 400W peak pulse power rating and can absorb significant transient energy.

What type of circuit does the SMBJ15CA protect? The SMBJ15CA protects electronic circuits, components, and systems from voltage transients and ESD.

This detailed guide provides comprehensive information on the SMBJ15CA diode, its pin functions, applications, and other technical specifications.