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Product Variant Information section
Product Specification Section
Pricing Section

Stock: 0

On Order: 0
Factory Stock:Factory Stock: 5,100
Factory Lead Time: 8 Weeks
Minimum Order: 400
Multiple Of: 100
Quantity Web Price
100+ $0.88


Attributes Table
Supply Current-Max 400µA
Supply Voltage 3V to 5.5V
Input Voltage 5.8V
Duty Cycle-Min 0%
Duty Cycle-Max 100%
Operating Temp Range -40°C to +85°C
Storage Temperature Range -65°C to +150°C
Output Current 5mA
Thermal Resistance 200°C/W
Features and Applications

The TC646BEOA is a part of TC646 Series PWM Controller.It can sustain a standard temperature ranging from -40 to +85 °C it comes in 8 pin SOIC package.

The TC646B is a new version of the existing TC646 fan speed controller. This device is a switch mode fan speed controller, which incorporates a new fan auto restart function. Temperature proportional speed control is accomplished using pulse width modulation.


  • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life
  • Efficient PWM Fan Drive
  • 3.0 V to 5.5 V Supply Range:
  • Fan Voltage Independent of TC646B/TC648B/TC649B Supply Voltage
  • Supports any Fan Voltage
  • FanSense™ Fault Detection Circuit Protects Against Fan Failure and Aids System Testing (TC646B/TC649B)
  • Automatic Shutdown Mode for “Green” Systems
  • Supports Low Cost NTC/PTC Thermistors
  • Over-Temperature Indication (TC646B/TC648B)
  • Fan Auto-Restart
  • Space-Saving 8-Pin MSOP Package


  • Personal Computers & Servers
  • LCD Projectors
  • Datacom & Telecom Equipment
  • Fan Trays
  • File Servers
  • General-Purpose Fan Speed Control