SR731ETTPR330F: KOA Speer's Premium 330mOhm Surface Mount Chip Resistor for Precision Applications

In the rapidly evolving electronics industry, the demand for reliable, high-performance passive components has never been greater. The SR731ETTPR330F from KOA Speer Electronics, Inc. emerges as a standout solution - a precision surface mount chip resistor that combines exceptional electrical characteristics with robust mechanical design. This comprehensive guide explores why engineers worldwide trust this component for critical applications ranging from automotive systems to industrial controls.

Why Choose KOA Speer's SR731ETTPR330F Chip Resistor?

KOA Speer Electronics has built a reputation as a leader in passive component manufacturing since its founding in 1940. The SR731ETTPR330F represents their commitment to innovation, featuring:

• Ultra-low 330 milliohm resistance for minimal power loss
• Thick film construction for enhanced durability
• AEC-Q200 qualification for automotive reliability
• Compact 0402 package (1.0mm 0.5mm) for space-constrained designs

Detailed Technical Specifications

Electrical Characteristics

The SR731ETTPR330F delivers:

• Resistance: 330m 1% (excellent for current sensing applications)
• Power Rating: 1/6W (0.167W) at 70 C
• TCR: 300ppm/ C (stable across temperature variations)
• Voltage Rating: 50V maximum

Mechanical Specifications

• Package: 0402 (1005 metric) - 1.0mm 0.5mm 0.4mm
• Termination: Matte tin-plated contacts for superior solderability
• Construction: Ceramic substrate with ruthenium oxide thick film

Key Features and Benefits

Automotive-Grade Reliability

The AEC-Q200 qualification means this resistor meets stringent automotive requirements for:

• Temperature cycling performance (-55 C to +150 C)
• High humidity resistance
• Mechanical shock and vibration endurance

Precision Current Sensing

With its low 330m resistance and tight 1% tolerance, the SR731ETTPR330F excels in:

• Power management circuits
• Battery monitoring systems
• Motor control applications
• Overcurrent protection circuits

Manufacturing Advantages

The component's design facilitates:

• Excellent solderability with Pb-free and SnPb solders
• Compatibility with reflow and wave soldering processes
• Stable performance after multiple reflow cycles

Application Scenarios

Automotive Electronics

Ideal for:

• ECU power circuits
• LED lighting systems
• Sensor interfaces
• Infotainment systems

Industrial Equipment

Perfect for:

• PLC I/O modules
• Motor drives
• Power supplies
• Test and measurement equipment

Consumer Electronics

Used in:

• Smartphones and tablets
• Wearable devices
• IoT products
• Power banks

Comparative Advantages

When benchmarked against similar resistors, the SR731ETTPR330F offers:

• Better TCR performance than standard thick film resistors
• Higher reliability than thin film alternatives at comparable costs
• Superior power handling for its size
• More stable long-term performance

Design Considerations

For optimal performance:

• Maintain proper PCB pad dimensions (0.6mm 0.5mm recommended)
• Follow IPC-7351 land pattern guidelines
• Consider thermal management for high-current applications
• Account for TCR in precision circuits

Purchasing Information

The SR731ETTPR330F is available through authorized distributors worldwide. Typical packaging options include:

• 7" reel (3,000 pieces)
• 13" reel (10,000 pieces)
• Cut tape options for prototyping

Conclusion

The SR731ETTPR330F from KOA Speer represents the ideal combination of precision, reliability, and compact design. Whether you're developing automotive electronics requiring AEC-Q200 compliance, industrial equipment needing robust performance, or consumer devices demanding space efficiency, this 330m chip resistor delivers exceptional value. Its thick film construction ensures long-term stability, while the 0402 package enables high-density PCB designs without compromising performance.

Engineers can confidently specify the SR731ETTPR330F knowing they're getting a component backed by KOA Speer's reputation for quality and supported by comprehensive technical documentation. For your next design requiring precise current sensing or power management in a compact footprint, the SR731ETTPR330F stands ready to exceed your expectations.