NCT3941S-A TR

Overview

The NCT3941S-A TR is a linear fan driver IC manufactured by Nuvoton Technology Corporation, designed for driving brushed DC fans. It operates within a supply voltage range of 8V to 17.6V and supports a load voltage of the same range. The device features an output current capacity of 500mA and utilizes PMOS technology with an open/switch interface. Packaged in an 8-SOIC (0.154 inch width) with an exposed pad, it is rated for operation between -20°C and 125°C junction temperature. This component integrates full control and power stages for general-purpose motor driving applications.

Feature Summary

• Integrates complete control logic and power stage for linear fan motor driving
• Utilizes PMOS technology for efficient high-side or low-side switching control
• Supports open/switch interface for simple digital control signals
• Designed for robust operation across wide industrial temperature ranges

Applications

• Brushed DC fan speed control in computer systems
• Linear fan driver for server and network equipment cooling
• General-purpose motor control in embedded systems
• Thermal management solutions for electronic enclosures

Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm package variant matches the 8-SOIC-EP specification. Check RoHS3 compliance status against current regulatory requirements. Ensure supply chain stability due to potential discontinuation risks associated with older generation driver ICs. Validate pinout compatibility during design-in phase.

Selection Notes

Select this component when a linear drive solution is required for 8V to 17.6V brushed DC fans. Consider the 500mA output limit for appropriate fan sizing. The exposed pad package requires thermal consideration on the PCB layout. Verify that the open/switch interface meets system control logic levels. Compare against alternatives if lower voltage operation or higher current capacity is needed.

Part Context

This part belongs to the NCT394x series of linear fan drivers from Nuvoton. It complements other variants like the NCT3940S which operates at lower voltages. The series provides integrated solutions for cooling applications where precise speed control via linear regulation is preferred over PWM methods. It serves as a dedicated driver for standard 4-pin or 3-pin DC fans in consumer and industrial electronics.

Replacement Considerations

• NCT3941S TR

FAQ

What is the maximum output current of the NCT3941S-A?

The maximum output current is 500mA.

Does the NCT3941S-A support PWM control?

No, it is a linear fan driver with an open/switch interface, not a PWM controller.

What is the operating temperature range?

The junction temperature range is -20°C to 125°C.