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MH 248 Hall-effect sensor is a temperature stable, stress-resistant , micro-power switch. Superior
high-temperature performance is made possible through a dynamic offset cancellation that utilizes
chopper-stabilization. This method reduces the offset voltage normally caused by device over molding,
temperature dependencies, and thermal stress.
The MH 248 includes the following on a single silicon chip: voltage regulator, Hall voltage
generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short circuit protected
open-drain output. Advanced CMOS wafer fabrication processing is used to take advantage of
low-voltage requirements, component matching, very low input-offset errors, and small component
geometries.
This device requires the presence of omni-polar magnetic fields for operation.
The MH 248 is rated for operation between the ambient temperatures ¨C40¡ãC and + 85¡ãC for the E
temperature range. The four package styles available provide magnetically optimized solutions for most
applications. Package types SO is an SOT-23(1.1 mm nominal height),ST is an Tsot-25(0.8 mm nominal
height),SU is an USON(0.5 mm nominal height) ,a miniature low-profile surface-mount package, while
package UA is a three-lead ultramini SIP for through-hole mounting.
The package type is in a lead (Pb)-free/ Green version was verified by third party Lab.

Features and Benefits

CMOS Hall IC Technology

Solid-State Reliability

Micro power consumption for battery-powered applications

Omni polar, output switches with absolute value of North or South pole from magnet

Operation down to 2.5V

High Sensitivity for direct reed switch replacement applications

Multi Small Size option

Custom sensitivity selection is available in optional package.

Pb Free/Green chip is qualified by third party lab.
Applications

Solid state switch

Handheld Wireless Handset Awake Switch

Flip Cell/PHS Phone/Note Book/Flip Video Set

PDVD/DC/DV/GPS

Liquid detection

Game machine/Position detection

Lid close sensor for battery powered devices

Magnet proximity sensor for reed switch replacement in low duty cycle applications

MH248.pdf