Bourns UT-A High-Temperature Power Resistors

Introduction

Bourns UT-A High-Temperature Power Resistors are wirewound resistors designed for dependable power dissipation in thermally demanding electronic systems. Built to meet AEC-Q200 requirements, these resistors combine robust construction, stable resistance characteristics, and strong pulse-energy capability.

Part Description

The UT-A series uses a ceramic core with a flame-resistant silicone coating to support reliable operation in harsh environments. Its wirewound design provides stable performance, low temperature coefficient of resistance (TCR), and effective heat tolerance.

Available resistance values range from 10 Ω to 4.5 kΩ, while power ratings span 1 W to 10 W. The series operates across a wide temperature range of -55°C to +150°C, making it suitable for circuits exposed to temperature cycling, elevated ambient heat, or high transient loads.

Key characteristics include:

• AEC-Q200 compliance for automotive-grade passive component qualification
• Wirewound resistor construction
• Ceramic core for thermal durability
• Flame-resistant silicone coating
• Resistance options from 10 Ω to 4.5 kΩ
• Power ratings from 1 W to 10 W
• Low TCR for improved resistance stability
• Excellent pulse-handling capability
• Operating temperature range of -55°C to +150°C

Applications

Potential applications for Bourns UT-A resistors include:

• Current limiting circuits
• Inrush current limiting
• Voltage divider networks
• Power supply bleeder resistors
• Snubber and damping networks
• Load balancing circuits
• Motor-drive control systems
• Battery-management systems
• Automotive power electronics
• High-power LED current control
• Industrial control equipment
• Appliance and HVAC electronics

Industries

The UT-A series can be used in a range of industries, including:

• Automotive and electric vehicles
• Transportation and rail systems
• Industrial automation
• Renewable energy
• Power conversion and energy storage
• Consumer appliances
• HVAC and building controls
• Telecommunications infrastructure
• Medical equipment
• Lighting and LED systems

Usage Ideas

1. Automotive Battery Precharge Circuit
   Use a UT-A resistor to limit inrush current while charging DC-link capacitors in an electric vehicle inverter or battery-powered system.

2. Motor Controller Snubber Network
   Pair the resistor with a capacitor to create an RC snubber that reduces switching transients and ringing in a motor-drive circuit.

3. High-Power LED Load Simulator
   Use an appropriately rated UT-A resistor as a durable test load for evaluating LED drivers, power supplies, or battery-output circuits.

Conclusion

Bourns UT-A High-Temperature Power Resistors provide a rugged wirewound solution for applications requiring stable resistance, power-handling capability, and resilience at elevated temperatures. With AEC-Q200 compliance, a broad resistance range, and power ratings up to 10 W, the series is well suited to automotive, industrial, energy, and other high-reliability power-electronics designs.