Honeywell is pleased to announce its new Magnetoresistive Sensor ICs, Nanopower Series. These two sensors, SM351LT and SM353LT are designed to accommodate a wide range of applications with large air gaps, small magnetic fields and lower power requirements. They respond to either a North or South pole applied in a direction parallel to the sensor and do not require a pull-up resistor.

Honeywell's new Nanopower Series is available in two magnetic sensitivities:

• Ultra-high sensitivity SM351LT: 7 Gauss typical operate, 11 Gauss maximum operate, very low current draw (360 nA typical)
• Very high sensitivity SM353LT: 14 Gauss typical operate, 20 Gauss maximum operate, very low current draw (310 nA typical)

Key Features

• High sensitivity: 7 Gauss typ., 11 Gauss max. (SM351LT); 14 G typ., 20 Gauss max. (SM353LT)
• Nanopower: Average current of 360 nA typ. (SM351LT) and 310 nA typ. (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 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:

• Refrigerators, Microwaves, Dishwashers
• Lid, door and drawer position detection
• Fluid flow

MEDIUM-SIZED CONSUMER ELECTRONICS

• Battery-optimization position sensor