HE3321A0400

The Littelfuse Inc. HE3321A0400 is a high-performance, compact, and reliable electronic fuse designed for overcurrent protection in various applications. This device is particularly useful in protecting sensitive electronic components from damage due to excessive current, making it an essential component in power management systems.

### Key Features

1. Overcurrent Protection: The HE3321A0400 provides precise overcurrent protection, ensuring that connected devices are safeguarded against current surges that could lead to failure or damage.

2. Resettable Functionality: Unlike traditional fuses that need to be replaced after a fault condition, the HE3321A0400 is a resettable fuse. Once the fault is cleared, the device automatically resets, allowing for continuous operation without the need for manual intervention.

3. Compact Design: The HE3321A0400 features a compact form factor, making it suitable for space-constrained applications. Its small size allows for easy integration into various electronic designs.

4. Fast Response Time: This electronic fuse is designed to respond quickly to overcurrent conditions, minimizing the risk of damage to downstream components. The fast response time is crucial in applications where timing is critical.

5. Wide Operating Voltage Range: The HE3321A0400 operates effectively across a wide voltage range, making it versatile for different applications, from consumer electronics to industrial equipment.

6. High Current Rating: The device is capable of handling high current loads, making it suitable for applications that require robust protection against overcurrent conditions.

7. Environmental Resistance: The HE3321A0400 is designed to withstand harsh environmental conditions, including temperature variations and humidity, ensuring reliable performance in diverse settings.

### Specifications

- Part Number: HE3321A0400
- Type: Resettable Electronic Fuse
- Rated Voltage: 32V DC
- Rated Current: 4A
- Hold Current: 4A (maximum continuous current)
- Trip Current: 6A (minimum current that will cause the fuse to trip)
- Reset Time: Automatic reset after fault condition is cleared
- Operating Temperature Range: -40°C to +85°C
- Package Type: Surface Mount Device (SMD)
- Dimensions: Approximately 3.2mm x 2.5mm x 1.0mm (L x W x H)
- Material: Composed of high-quality materials that provide durability and reliability.

### Applications

The Littelfuse HE3321A0400 is suitable for a wide range of applications, including:

- Consumer Electronics: Smartphones, tablets, and laptops where overcurrent protection is critical.
- Automotive: Electric vehicles and automotive electronics that require reliable protection against current surges.
- Industrial Equipment: Machinery and control systems that need protection from overcurrent conditions.
- Telecommunications: Networking equipment and communication devices that require stable and protected power supplies.

### Conclusion

The Littelfuse Inc. HE3321A0400 is an advanced electronic fuse that offers reliable overcurrent protection in a compact and efficient package. Its resettable functionality, fast response time, and wide operating voltage range make it an ideal choice for various applications across consumer electronics, automotive, industrial, and telecommunications sectors. By integrating the HE3321A0400 into electronic designs, engineers can ensure the safety and longevity of their products while minimizing downtime and maintenance costs.