RFD3055LE: High-Performance N-Channel MOSFET by onsemi - Complete Guide

The RFD3055LE from onsemi is a top-tier N-channel enhancement-mode MOSFET engineered for demanding power electronics applications. As part of onsemi's renowned discrete semiconductor portfolio, this device combines robust performance with exceptional reliability. Below, we explore its technical specifications, advantages, and real-world applications to help engineers and designers make informed decisions.

In-Depth Technical Specifications

1. Core Electrical Parameters

• Drain-Source Voltage (V_DSS): 60V maximum rating
• Continuous Drain Current (I_D): 11A at 25 C case temperature
• Pulsed Drain Current: 44A (limited by package)
• Gate Threshold Voltage (V_GS(th)): 2-3V typical

2. Efficiency Characteristics

• On-Resistance (R_DS(on)): Only 107m at 5V V_GS
• Total Gate Charge (Q_G): 11.3nC (enables fast switching)
• Input Capacitance (C_iss): 350pF typical

3. Robust Thermal Performance

• Power Dissipation: 38W maximum
• Junction Temperature Range: -55 C to +175 C
• Thermal Resistance: 3.33 C/W junction-to-case

Advanced Package Features

The RFD3055LE utilizes onsemi's I-PAK (TO-251AA) package with:

• Through-hole mounting for mechanical stability
• Optimized leadframe design for enhanced thermal dissipation
• Compact footprint (6.6mm x 6.2mm body)
• Industry-standard pinout for easy replacement

Key Advantages for Design Engineers

1. Optimized Power Efficiency

The combination of low R_DS(on) and fast switching characteristics minimizes both conduction and switching losses, making it ideal for:

• High-frequency DC-DC converters
• PWM motor drives
• Class D audio amplifiers

2. Enhanced System Reliability

With 60V breakdown voltage and 16V maximum gate drive, the RFD3055LE offers:

• Excellent overvoltage margin
• Stable operation in noisy environments
• Long-term durability in industrial settings

3. Simplified Thermal Management

The I-PAK package's thermal characteristics allow for:

• Direct PCB heat sinking
• Compatibility with standard heatsinks
• Reliable operation at high ambient temperatures

Comprehensive Application Guide

1. Switch-Mode Power Supplies

Ideal for:

• AC-DC converters up to 300W
• Synchronous rectification stages
• Forward and flyback converter designs

2. Motor Control Systems

Excellent performance in:

• Brushed DC motor drives
• Stepper motor controllers
• Automotive window/lift mechanisms

3. Industrial Automation

Proven reliability for:

• PLC output modules
• Solid-state relay replacements
• Power distribution controls

4. Consumer Electronics

Common uses include:

• LED driver circuits
• Battery management systems
• Power tools and appliances

Design Considerations

1. Gate Drive Recommendations

• Use 5-10V gate drive for optimal R_DS(on)
• Implement gate resistors (4.7-10 typical)
• Consider Miller plateau effects in high-speed switching

2. PCB Layout Guidelines

• Minimize high-current loop areas
• Use thick copper traces (2oz recommended)
• Include proper thermal vias for heat dissipation

3. Protection Circuits

• Implement TVS diodes for inductive load protection
• Consider current sensing for overload protection
• Use proper heatsinking for continuous high-current operation

Comparison with Similar Devices

Parameter	RFD3055LE	IRF540N	STP55NF06L
VDSS	60V	100V	60V
ID	11A	33A	55A
RDS(on)	107m	44m	20m
Package	I-PAK	TO-220	TO-220

Purchasing Information

The RFD3055LE is available through authorized distributors including:

• Digi-Key Electronics
• Mouser Electronics
• Newark element14

Typical pricing ranges from $0.75 to $1.25 in quantity 100+.

Conclusion

The RFD3055LE represents an optimal balance of performance, reliability, and cost for medium-power applications. Its combination of 60V breakdown, 11A continuous current, and efficient switching characteristics make it particularly valuable for:

• Space-constrained designs requiring I-PAK packaging
• Cost-sensitive applications needing reliable performance
• Systems operating in challenging thermal environments

For engineers seeking a proven MOSFET solution with comprehensive documentation and reliable supply chain support, the onsemi RFD3055LE delivers exceptional value across numerous power electronics applications.