Littelfuse LF21115TMR

The LF21115TMR TMR Switch is a digital omni - polar magnetic switch that integrates TMR and CMOS technology in order to provide a magnetically triggered digital switch with high sensitivity, high speed, and low power consumption. It contains a TMR magnetic sensor and CMOS signal processing circuitry within the same package, including an on - chip TMR voltage generator for precise magnetic sensing, a TMR voltage amplifier and comparator plus a Schmitt trigger to provide switching hysteresis for noise rejection, CMOS push - pull output and X axis sensing direction. An internal band gap regulator is used to provide a temperature compensated supply voltage for internal circuits, permitting a wide range of supply voltages. It draws only 200nA (see Features below) resulting in low power operation, additionally it has fast response, accurate switching points, excellent thermal stability, and immunity to stray field interference. It is available in the SOT23 - 3 package. The output of the LF21115TMR switches low (turns on) when the magnetic field parallel to the sensing axis exceeds the operate point threshold, B(OP). When the magnetic field is reduced below the release point B(RP) device output switches high (turns off). The difference between the B(OP) and the B(RP) is the hysteresis B(H) of the device.

• Tunneling Magnetoresistance (TMR) Technology - Ultra low power consumption at 200nA
• F - axis sensing direction - High Frequency up to 50Hz - Operation with North or South Pole - 1.8V to 5.5V Operating Range

• Proximity Switches
• Utility Meters including Gas, Water and Heat Meters
• Speed Sensing
• Ultra low power applications
• Roots and Linear Position sensing