SM353LT Magnetic Sensors

Technical Specifications of SM353LT

Datasheet	SM353LT datasheet
Category	Sensors, Transducers
Family	Magnetic Sensors – Switches (Solid State)
Manufacturer	Honeywell Sensing and Productivity Solutions
Series	Nanopower
Packaging	Cut Tape (CT)
Part Status	Active
Function	Omnipolar Switch
Technology	Magnetoresistive
Polarization	Either
Sensing Range	±2mT Trip, ±0.3mT Release
Test Condition	-40°C ~ 85°C
Voltage – Supply	1.65 V ~ 5.5 V
Current – Supply (Max)	600nA
Current – Output (Max)	150μA
Output Type	Push-Pull
Features	–
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23

SM353LT Product Overview

A magnetoresistive (MR) sensor IC in a 3-pin SOT-23 packaging is called the SM353LT from the Nanopower series. Large air gaps, weak magnetic fields, and low power requirements are all features of this ultra-sensitive gadget that allow it to be used in various applications. The sensor IC will react depending on which pole is applied in a direction parallel to the sensor. By making installation simpler and possibly lowering system costs, the SM353LT does not require the identification of magnet polarity. The push-pull output of this sensor eliminates the need for a pull-up resistor and uses a low average current consumption. Being energy-efficient, it can function with a 1.65V supply voltage.

Honeywell Nano Power Series

The Magnetoresistive (MR) Sensor ICs from Honeywell’s Nanopower Series are ultra-sensitive components that support various applications with huge air gaps, weak magnetic fields, and low power needs.

The North or South poles applied in a direction parallel to the sensor cause the sensor ICs to respond. They simplify installation and might save system costs because the magnet polarity does not need to be known. They have a push-pull output that does not require a pull-up resistor and a shallow average current usage. The sensor ICs can function with a supply voltage as low as 1.65 V to increase energy efficiency.

To meet a range of application needs, the Nanopower Series is offered in two magnetic sensitivities:

• Applications demanding shallow current draw and high magnetic sensitivity (7 G typically operate, 11 G maximum operates) (360 nA typical).
• Applications requiring a shallow current draw and a very high magnetic sensitivity (14 G normal operate, 20 G maximum operate) (310 nA typical).
• For automated pick-and-place component installation, these magnetoresistive sensor ICs from the Nanopower Series are provided in the subminiature SOT-23 surface mount package on tape and reel (3000 units per reel).

SM353LT Applications

Industrial

• Mobile equipment (i.e., scanners, handheld computing equipment)
• Controlling access to buildings and replacing battery-operated security systems with reed switches
• Industrial Smoke Detectors

Medical

• Exercise Equipment
• Infusion Pumps
• Drawer Position Sensing
• Hospital beds

White Goods

• Door, Lid, and Drawer Position Detection
• Fluid Flow

Consumer Electronics

• Battery-Optimization Position Sensor

SM353LT Features and Benefits

• High sensitivity: Typical 7 Gauss, Maximum 11 Gauss (SM351LT).
• 20 Gauss maximum, 14 G typical (SM353LT).
• Nanopower: SM351LT’s average current is 360 nA and 310 nA, respectively (SM353LT).
• Range of supply voltage: 1.65 Vdc to 5.5 Vdc; makes design-in easier.
• Omnipolar sensing: A magnet’s poles can be used to activate it.
• -40 °C to 85 °C [-40 °F to 185 °F] is the temperature range.
• Push-pull output: Does not need a pull-up resistor externally.
• Design without chopper stabilization.
• Materials that comply with RoHS accords with Directive 2002/95/EC.
• Contains SOT-23.

Frequently Asked Questions

What are Magnetoresistive Sensors?

An applied magnetic field is detected using tiny components known as magnetoresistive sensors. The sensor can function across a sizable air gap because no electrical contact is necessary. Magnetoresistive sensors are made to be compact and power-efficient to enable embedding.

The magnetoresistive effect describes how an applied magnetic field can change the resistance of an electrical wire. The resistance changes depending on how the field lines are positioned about the direction of the current flow.

This anisotropic magnetoresistive sensor (AMR) can be compared to the Hall Effect sensor. Hall Effect sensors are often less accurate and work at shorter ranges than AMR sensors. In contrast to Hall Effect sensors, AMR sensors cannot detect a complete 360-degree rotation of the magnetic field.

Magnetoresistive sensors have a wide range of uses, the majority focusing on locating or confirming the presence of objects. A magnetoresistive sensor can be inserted into the drawer to determine if a medical cabinet is open or closed. The magnetoresistive sensor on a treadmill can function as a dead-man switch, turning the machine off if the safety key is withdrawn.

Working Principle of Magnetoresistor?

It operates according to the electrodynamics principle, which asserts that any force acting on a magnetic field will cause a change in the direction of any current present. The charge carriers in the magneto resistor move in a straight line when there is no magnetic field.

The direction of the current shifts and flows in the opposite direction when there is a magnetic field present. Their charge carriers’ mobility is increased by the current’s indirect path, which results in the collision.

The collision accelerates the energy loss in the form of heat. The magneto resistor’s resistance rises as a result of this heat.

Due to a shortage of free electrons, a tiny current flows in the magneto resistor.

The magneto resistor electrons’ mobility affects how they deflect. In comparison to metals, it is more prevalent in semiconductor materials.

What are Magnetic Sensors?

Magnetic field flux, strength, and direction are all measured by magnetic sensors. Magnetic field sensing has long been important in many industries.

It is possible to monitor things’ positions, orientations, revolutions, angles, the presence of an electric current, and other things using magnetic sensor readings (changes and fluctuations in the magnetic field). Magnetic sensors are thus employed in various industries, including the automotive, military, robotics, medical, space, and industrial measurement fields.

What are the advantages of Magneto resistive sensors?

• They operate without physical contact, preventing wear and friction. Thus, there are indefinitely many operating cycles.
• High reliability as a result of its tough design
• A small and steady offset
• Its exceptional sensitivity allows for the measurement of weak magnetic fields.
• Relatively low sensitivity to mechanical stress
• Unlike inductive sensors, vibration sensitivity is much lower.
• Functioning at a high temperature
• The wide frequency range of operation (0 Hz to 1 MHz)
• Suitable for usage in hostile environments
• Affordable price
• Able to gauge zero speed
• Small size
• Fast reaction

What are the Disadvantages of Magnetoresistive sensors?

• Sensitive to magnetic fields that interfere.
• A very powerful magnetic field can harm the sensor.
• Linear Range with Limited Temperature Drift
• Deficient Temperature Features

Some of the applications of Magnetoresistive sensors are

• Wheels’ speed monitors.
• Measuring of angles.
• Measurement of linear displacement.
• Presently measurable.
• Detection of the earth’s magnetic field for compass and navigational purposes.
• Detect metal.
• Calculating the magnetic field.

Conclusion

The magnetoresistive effect explains how an applied magnetic field can modify an electrical wire’s resistance. The resistance varies according to the orientation of the field lines concerning the current flow. It is possible to compare the Hall Effect sensor to this anisotropic magnetoresistive sensor (AMR). Compared to AMR sensors, hall effect sensors frequently have worse accuracy and operate at shorter ranges. In contrast to Hall Effect sensors, AMR sensors cannot detect a magnetic field that has rotated 360 degrees.

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