SMBJ33A-E3

series introduction

# Introduction to the SMBJ33A - E3 Product Series

## 1. Overview
The SMBJ33A - E3 product series belongs to the transient voltage suppressor (TVS) category. TVS devices are crucial components in modern electronic circuits, designed to protect sensitive electronic equipment from voltage spikes and transient events. The SMBJ33A - E3 series offers reliable and efficient protection, making it an ideal choice for a wide range of applications.

## 2. Key Specifications

### Electrical Characteristics
- **Breakdown Voltage**: The SMBJ33A - E3 has a specified breakdown voltage of approximately 33V. This means that when the voltage across the device reaches this level, the TVS starts to conduct current, diverting the excess energy away from the protected circuit.
- **Clamping Voltage**: Under a specific test current, the clamping voltage of the SMBJ33A - E3 is designed to limit the voltage across the protected circuit to a safe level. This ensures that the sensitive components in the circuit are not exposed to excessive voltages during transient events.
- **Peak Pulse Power Dissipation**: It can handle a significant amount of peak pulse power. This parameter indicates the device's ability to absorb and dissipate the energy from a transient event. The high peak pulse power dissipation of the SMBJ33A - E3 makes it suitable for applications where large voltage spikes may occur.

### Package and Physical Characteristics
- **Package Type**: The SMBJ33A - E3 comes in a standard SMB (Surface Mount SMB) package. This surface - mount package is widely used in modern printed circuit board (PCB) designs due to its small size and ease of assembly.
- **Dimensions**: The SMB package has well - defined dimensions, which allows for easy placement on the PCB. The compact size of the package also helps in saving board space, making it suitable for applications with limited real estate.
- **Lead Finish**: The leads of the SMBJ33A - E3 are typically finished with a suitable material, such as tin - lead or lead - free finishes, to ensure good solderability and long - term reliability.

## 3. Working Principle
When a transient voltage spike occurs in the circuit, the SMBJ33A - E3 quickly responds. As the voltage across the device exceeds its breakdown voltage, it enters a low - impedance state. In this state, the TVS conducts a large amount of current, effectively shunting the excess energy away from the protected components. Once the transient event has passed, the SMBJ33A - E3 returns to its high - impedance state, allowing the normal operation of the circuit to resume.

## 4. Applications

### Consumer Electronics
- **Smartphones and Tablets**: In these portable devices, the SMBJ33A - E3 can protect the sensitive integrated circuits, such as the processor, memory, and display drivers, from electrostatic discharge (ESD) and voltage transients that may occur during handling or charging.
- **Televisions and Set - Top Boxes**: It helps safeguard the internal circuits from power surges and transient events that can be caused by lightning strikes or power grid fluctuations.

### Industrial Electronics
- **Industrial Control Systems**: Protects the control boards, sensors, and communication interfaces in industrial automation systems from voltage spikes that may be generated by motors, relays, or other high - power devices.
- **Power Supplies**: The SMBJ33A - E3 can be used in power supply circuits to protect against overvoltage conditions, ensuring the stable operation of the power supply and the connected equipment.

### Automotive Electronics
- **Automotive Infotainment Systems**: Protects the audio, video, and navigation systems in vehicles from electrical transients that can be induced by the vehicle's electrical system or external sources.
- **Engine Control

Images for reference

DO-214AC, SMA

Image Preview

Image Preview

Datasheets

• SMBJ5.0A - SMBJ188A
• PDF 2
• PDF 3

Partlist