HoneywellSM353LTMagnetoresistive Sensors

Honeywell Nanopower Series

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.

The 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. They use a very low average current consumption and a push-pull output which 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.

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).
• •  SM353LT: For applications requiring very high magnetic sensitivity (14 G typical operate, 20 G maximum operate) and a very low current draw (310 nA typical).

These Magnetoresistive Sensor ICs, Nanopower Series, are supplied in the subminiature SOT-23 surface mount package on tape and reel (3000 units per reel), for use in automated pick-and-place component installation.

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
•  CONSUMER ELECTRONICS
• •  Battery-optimization position sensor

Features and Benefits

• •  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

Related Product

SM351LT       SM353LT

No need for electrical contact when designing this SM353LT magnetoresistive sensor by Honeywell into your circuit, as it can change resistance based on changing magnetic fields. This device has a minimum operating supply voltage of 1.65 V and a maximum of 5.5 V. This part has a minimum operating temperature of -40 °C and a maximum of 85 °C. This component will be shipped in tape and reel packaging to allow for effective mounting and safe delivery.