AH3781-P-B

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Magnetic sensors, also known as magneto-resistors, are magnetic field transponders used to detect changes in magnetic fields. Solid state magnetic sensors are typically used for contact-less activation or deactivation of mechanical and electric components and systems. The AH3781-P-B from PHOENIX CONTACTs is an excellent example of a solid state magnetic switch.

The AH3781-P-B is an integrated, single-phase, Hall-effect switch which operates by detecting the presence of a magnetic field. The device features a 3-pin SOT23 package with a forward voltage range of 2.7V - 12V and a low current consumption of only 6µA. The switch features a high sensitivity of 700 mV/µT and a fast response time of 5 µs.

The AH3781-P-B can be used in various applications including, but not limited to, over-temperature warnings, speed control, industrial controls, power tools, and medical equipment. It offers many advantages to its users such as the ability to sense magnetic fields without contact with installation, and reliable switching. Additionally, this magnetic switch provides a high switching accuracy with minimum malfunctioning.

At a high level, the AH3781-P-B works by sensing the strength of a magnetic field and providing an output signal when the field reaches a predefined level. The switch is activated when the magnet field strength exceeds the threshold, causing a voltage drop across the digital output. If the magnet field weakens, the output signal will read as low and the switch will be deactivated. The switching threshold and hysteresis are programmable.

The AH3781-P-B is a conduction based switching solution which means it requires an electrical path to the target. The switch is soldered on a printed circuit board (PCB) and connected to the electronics it needs to control. The magnetic component being used with switch needs to be in close proximity to the switch in order for it to detect and respond to the magnet fields.

In summary, the AH3781-P-B is a solid-state magnetic switch designed for use in a wide range of applications. It is an ideal choice for contact-less activation and deactivation of electric and mechanical components, offering ultra-precision and reliable switching with minimal maintenance and operational costs. The switch is soldered onto a circuit board and connected to the target component, requiring only a low supply voltage and low current consumption for its operation.

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