Fan Failure, 3V-5.5V Supply, 124 mV Threshold, Active-Low, Push-Pull, SOT-23-6

TC670ECHTR - Fan Failure, 3V-5.5V Supply, 124 mV Threshold, Active-Low, Push-Pull, SOT-23-6

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Newark Part No.:
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Product Overview

The TC670ECHTR is an integrated Fan Speed Sensor predicts or detects fan failure, preventing thermal damage to systems with cooling fans. When the fan speed falls below user-specified level, the TC670 asserts an ALERT signal. With this design, a critical minimum fan speed is determined by the user. The fan alert level is then set with a resistor divider on the THRESHOLD pin (Pin 1) of the TC670. When the minimum fan speed is reached, the ALERT pin (Pin 5) changes from a digital high to low. This failure detection works with all linear-controlled 2-wire fans. The TC670 eliminates the need for 3-wire fan solutions. A CLEAR option can be used to reset the ALERT signal, allowing the flexibility of connecting the ALERT output of the TC670 with other ALERT/FAULT interrupts in the system. This feature can be implemented so that false fan fault conditions do not initiate system shutdown.
  • Fan wear-out detection for 2-wire linear-controlled fans
  • Replacement system for 3-wire fans
  • Fan alert signal when fan speed is below programmed threshold
  • CLEAR capability for eliminating false alarm
  • 90µA Typical low operating current


Automation & Process Control, Portable Devices, Sensing & Instrumentation

Product Information

Active-Low, Push-Pull
MSL 1 - Unlimited
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