TC647EOATR

Overview

The TC647EOATR is a switch-mode fan speed controller designed for brushless DC motors, manufactured by Microchip Technology. It operates within a supply voltage range of 3V to 5.5V and features an operating current of 200 uA. The device supports temperature-proportional speed control via pulse width modulation using a thermistor input. It includes FanSense technology for fault detection and an integrated start-up timer. The component is housed in an SOIC-8 surface-mount package and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates FanSense technology for monitoring normal operation and detecting stalled or open fans.
• Provides temperature-proportional PWM speed control using external thermistor inputs.
• Includes an integrated start-up timer to ensure reliable motor initialization.
• Supports shutdown mode functionality for system power management.

Applications

• Brushless DC motor speed control
• Fan speed regulation with thermal feedback
• System reliability monitoring via fault detection

Procurement Notes

Verify the specific suffix 'E' against official documentation to confirm industrial temperature rating compliance. Confirm package type matches SOIC-8 requirements. Check current lifecycle status as end-of-life information may affect long-term availability. Ensure humidity sensitivity handling protocols are followed during storage and assembly processes.

Selection Notes

Select this component when industrial temperature performance is required alongside FanSense fault detection. Compare against TC647B variants if restart capabilities differ from standard shutdown modes. Verify that the SOIC-8 package fits the target PCB layout constraints. Ensure the application utilizes a thermistor for the VIN input to enable proportional speed control.

Part Context

This part belongs to the TC647 series of fan controllers from Microchip Technology. The series focuses on enhancing system reliability through proprietary FanSense monitoring. Variants within the family typically differ by package style (SOIC vs MSOP) and temperature grade (Commercial vs Industrial).

Replacement Considerations

TC647VOATR

FAQ

How does the TC647EOATR detect fan faults?

It uses FanSense technology to monitor a pulse train at the SENSE pin. A missing pulse indicates a stall, open circuit, or unconnected fan, triggering the start-up timer and potentially latching the device in shutdown mode.

What is the function of the VMIN input?

The VMIN input sets the minimum fan speed via a resistor divider and can also be used to trigger a logic low shutdown of the fan.