Description SM351LT Honeywell Hall Effect Sensor , Honeywell’s Nanopower Series Magnetoresistive (MR) Sensor ICs are ultra-sensitive devices designed to accommodate a wide range of applications with large air gaps, small magnetic fields, and low power requirements. SM351LT Hall Effect Sensor ICs respond to either a North or South pole applied in a direction parallel to the sensor. They do not require the magnet polarity to be identified, simplifying installation and potentially reducing system cost. These sensor ICs use a very low average current consumption and a push-pull output that does not require a pull-up resistor. The sensor ICs can operate from a supply voltage as low as 1.65 V, promoting energy efficiency. Key Features • High sensitivity: 7 Gauss type., 11 Gauss max. (SM351LT); 14 G typ., 20 Gauss max. (SM353LT) • Nanopower: Average current of 360 nA type. (SM351LT) and 310 nA type. (SM353LT) • Supply voltage range: 1.65 Vdc to 5.5 Vdc; simplifies design-in • Omnipolar sensing: Activates with either pole from a magnet • Temperature range: -40 °C to 85 °C [-40 °F to 185 °F] • Push-pull output: Does not require an external pull-up resistor • Non-chopper stabilized design • RoHS-compliant materials: Meets Directive 2002/95/EC • Package: SOT-23 Potential Applications Industrial • Mobile equipment (i.e., handheld computing equipment, scanners) • Water, electric, and gas utility meters • Building access control; reed switch replacement for battery-operated security systems • Industrial smoke detectors MEDICAL • Exercise equipment • Infusion pumps • Drawer position sensing (e.g., medical cabinets) • Hospital beds WHITE GOODS • Lid, door, and drawer position detection • Fluid flow MEDIUM-SIZED CONSUMER ELECTRONICS • Battery-optimization position sensor The Nanopower Series is available in two magnetic sensitivities to accommodate a variety of application needs: • SM351LT: For applications requiring ultra-high magnetic sensitivity (7 G typical operate, 11 G maximum operate) and a very low current draw (360 nA typical).
