Honeywell SS494B

The SS490 series are small, versatile linear Hall-effect devices driven by magnetic fields generated by permanent or electromagnets. The ratiometric output voltage is set by the supply voltage and varies proportionally with magnetic field strength. The IC provides enhanced temperature stability and sensitivity. Laser-trimmed thin-film resistors deliver high accuracy (null offset ±%, sensitivity up to ±3%) and temperature compensation. They respond to both positive and negative Gauss magnetic fields and can monitor one or both magnetic poles. The quad Hall sensor element design minimizes the effects of mechanical or thermal stress on the output. The positive temperature coefficient of sensitivity (typical +0.02%/°C) helps compensate for the negative temperature coefficient of low-cost magnets, enabling robust designs over a wide temperature range. Rail-to-rail operation (across the full voltage range) provides more usable signal for higher precision. These devices operate from -40°C to 150°C, making them suitable for industrial and automotive environments. The SS490B version offers a cost-effective sensing solution with wider null offset and sensitivity tolerances and greater temperature drift compared to the higher-performance SS490A. Both the SS490A and SS490B versions feature a typical sink or source output of 1.5 mA continuous, draw 7 mA supply current at 5.0 V and 25°C, and deliver predictable performance across the full temperature range. To provide design flexibility, these products are available in the following flat TO-92 package styles: straight standard leads bulk, straight long leads bulk, formed leads box/tape, straight standard leads box/tape, and surface mount bag/reel.

• Linear output for circuit design flexibility
• Quad Hall IC design minimizes mechanical stress effects
• Responds to positive or negative Gaussian magnetic fields
• High efficiency operation at 7 mA current under 5 V DC
• Single current sink or source output
• Rail-to-rail operation provides more usable signal for higher accuracy
• Temperature-compensated magnetic elements for stable operation over wide temperature range of -40°C to 150°C

• Basic current sensing for motor load monitoring and detection
• Anti-tamper magnetic field sensing in smart remote utility meters
• Pump control in heavy equipment and home appliances
• Simple linear or angular displacement sensing
• Handlebar/throttle position sensing in e-bikes and scooters