OMH3040S

Series:	--
Packaging:	Bulk
Part Status:	Active
Function:	Unipolar Switch
Technology:	Hall Effect
Polarization:	South Pole
Sensing Range:	27mT Trip, 2.5mT Release
Test Condition:	-55°C ~ 125°C
Voltage - Supply:	4.5 V ~ 24 V
Current - Supply (Max):	11mA
Current - Output (Max):	25mA
Output Type:	Open Collector
Features:	--
Operating Temperature:	-55°C ~ 125°C (TA)
Package / Case:	3-SSIP
Supplier Device Package:	TO-92-3

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Magnetic Sensors - Switches (Solid State)

Magnetic sensors (also referred to as Magnetic switches, Solid-state switches, Reed switches, Reed relays or Contactless switch sensors) are devices that activate when exposed to magnetic fields. A variety of applications make them highly desirable in many industries, including medical, industrial, consumer and automotive applications.One such sensor, the OMH3040S, is a miniature low cost Hall Effect magnetic forward/reverse position switch designed for robust and reliable operation in challenging environments. The OMH3040S can be used in a wide variety of applications, including DC motor control, solenoid control, automotive ignition, hand dryers, and many others. Let’s take a closer look at the OMH3040S and explore some of its distinct features.

OMH3040S Features

The OMH3040S is a bi-directional, pin-selectable Hall Effect sensor. This device features an extremely low quiescent current of 250 nA, and offers a wide dynamic range. It can detect low magnetic fields down to 30mT (0.3 Gauss) and can accommodate high magnetic fields up to 4T (40 Gauss).The OMH3040S is also highly reliable. Its auto-compensation design simplifies the installation process and minimizes the need for tweaking. This eliminates calibration and ensures immediate operation following switch installation. The OMH3040S also features a high-impedance open collector output, which makes it resistant to voltage surges.

OMH3040S Applications

The OMH3040S can be used in a wide variety of applications. It is designed for reliable operation in challenging environments, making it an excellent choice for applications such as DC motor direction control, solenoid control, automotive ignition, hand dryers, door locks, HVAC control, and security systems. In motor control applications, the OMH3040S can be used to indicate when the motor is in forward or reverse directions. The sensor’s bi-directional design allows it to be used in two-way systems, and its wiring flexibility makes it ideal for several motors to be connected in series. In addition to motor control applications, the OMH3040S can also be used in security applications. It can be used as a contactless switch to control doors, windows, and access points. Its high-impedance open collector output provides additional security by making the switch resistant to voltage surges.

Working Principle

The OMH3040S operates on the Hall Effect principle. The Hall Effect is a phenomenon in which electrical current is induced in a conductor when it is exposed to a magnetic field, and can be explained using the Lorentz Force. The Lorentz Force states that a current-carrying conductor placed in a magnetic field will experience a force equal to the product of the field strength and the current in the conductor. In a Hall Effect device, a small current is injected into a semiconductor material and an output voltage is generated when a magnetic field is applied. The voltage generated is proportional to the strength of the magnetic field. In the OMH3040S, the application of a strong magnetic field results in an open collector output.

Conclusion

The OMH3040S is a miniature, low cost, Hall Effect forward/reverse position switch designed for robust and reliable operation in challenging environments. It features an extremely low quiescent current of 250 nA, and offers a wide dynamic range. The OMH3040S can be used in a variety of applications such as DC motor control, solenoid control, automotive ignition, hand dryers, and security systems. The OMH3040S operates on the Hall Effect principle, where a voltage is generated when a magnetic field is applied. This makes the OMH3040S an ideal choice for many applications where robust and reliable operation is required.

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