SMCJ75C-E3

series introduction

# Introduction to the SMCJ75C - E3 Product Series

## 1. Overview
The SMCJ75C - E3 product series belongs to the realm of semiconductor protection devices, specifically transient voltage suppressors (TVS). These components play a crucial role in safeguarding electronic circuits from the potentially damaging effects of transient voltage events, such as electrostatic discharge (ESD), electrical fast transients (EFT), and lightning-induced surges.

## 2. Key Features

### 2.1 High - Voltage Clamping
The "75" in the SMCJ75C - E3 indicates its stand - off voltage rating of 75V. This means that under normal operating conditions, the TVS allows the circuit to function at or below this voltage level without interfering. However, when a transient overvoltage event occurs, the device quickly switches to a low - impedance state and clamps the voltage to a safe level, protecting the downstream components from excessive voltage stress.

### 2.2 Fast Response Time
One of the most significant advantages of the SMCJ75C - E3 series is its extremely fast response time. It can react to transient events in nanoseconds, which is essential for protecting sensitive electronic components. In high - speed circuits, even a brief overvoltage spike can cause data corruption, component failure, or system malfunctions. The rapid response of these TVS devices ensures that the overvoltage is suppressed before it can cause any harm.

### 2.3 High Surge Current Capability
These TVS diodes are designed to handle high surge currents. They can withstand large amounts of energy during a transient event, which is crucial for applications where the potential for high - energy surges exists, such as in power distribution systems, industrial control circuits, and automotive electronics. The SMCJ75C - E3 series can dissipate the surge energy effectively, preventing it from reaching and damaging the protected circuit.

### 2.4 Low Leakage Current
In normal operating conditions, the SMCJ75C - E3 series exhibits very low leakage current. This is important because excessive leakage current can cause power losses, generate heat, and potentially affect the performance of the protected circuit. The low leakage characteristic ensures that the TVS has minimal impact on the normal operation of the circuit, making it suitable for battery - powered and low - power applications.

## 3. Package and Physical Characteristics

### 3.1 Package Type
The SMCJ75C - E3 comes in a surface - mount SMC package. This package type is widely used in modern electronic manufacturing due to its compact size and ease of assembly. The surface - mount design allows for automated pick - and - place assembly processes, which are highly efficient and cost - effective for mass production.

### 3.2 Dimensions
The SMC package has standard dimensions, which makes it compatible with a variety of printed circuit board (PCB) designs. The compact size of the package also helps in saving valuable PCB space, which is especially important in applications where miniaturization is a key requirement, such as in mobile devices and portable electronics.

### 3.3 Thermal Performance
The package is designed to provide good thermal performance. It can dissipate the heat generated during a surge event effectively, preventing the TVS from overheating and ensuring its long - term reliability. The thermal characteristics of the SMCJ75C - E3 series contribute to its ability to handle repeated surge events without degradation in performance.

## 4. Applications

### 4.1 Power Supplies
In power supply circuits, the SMCJ75C - E3 series can protect against overvoltage spikes caused by power grid fluctuations, lightning strikes, or switching transients. It ensures the stable operation of the power supply and protects the connected electronic devices from damage due

Images for reference

DO-214AB, SMC

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Datasheets

• SMCJ5.0-188CA
• PDF 2

Partlist