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TC647B - PWM Fan Speed Controllers

Download the TC647B datasheet PDF. This datasheet also covers the TC642B variant, as both devices belong to the same pwm fan speed controllers family and are provided as variant models within a single manufacturer datasheet.

General Description

The TC642B/TC647B devices are new versions of the existing TC642/TC647 fan speed controllers.

These devices are switch mode, fan speed controllers that incorporate a new fan auto-restart function.

Temperature-proportional speed control is accomplished using pulse width modulation.

Key Features

  • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life.
  • Efficient PWM Fan Drive.
  • 3.0V to 5.5V Supply Range: - Fan Voltage Independent of TC642B/TC647B Supply Voltage - Supports any Fan Voltage.
  • FanSense™ Fault Detection Circuit Protects Against Fan Failure and Aids System Testing.
  • Shutdown Mode for "Green" Systems.
  • Supports Low Cost NTC/PTC Thermistors.
  • Over-Temperature Indication (TC642B only).

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (TC642B-Microchip.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Microchip Technology

Part Number Description
TC647 PWM Fan Speed Controller
TC642 PWM Fan Speed Controller
TC642B PWM Fan Speed Controllers
TC643 INTEGRATED FAN / MOTOR DRIVER
TC646 PWM Fan Speed Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
M TC642B/TC647B PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense™ Technology for Fault Detection Features • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life • Efficient PWM Fan Drive • 3.0V to 5.