加速器用线性霍尔IC

General Description
The SH49E is a small, versatile linear Hall-effect device that is operated by the magnetic field from a
permanent magnet or an electromagnet. The output voltage is set by the supply voltage and varies in
proportion to the strength of the magnetic field.
The integrated circuitry features low noise output, which makes it unnecessary to use external filtering. It
also includes precision resistors to provide increased temperature stability and accuracy. The operating
temperature range of these linear Hall sensors is -40oC to 85oC, appropriate for commercial, consumer
and industrial applications.
The SH49E is available in standard TO-92S and SOT-23-3 packages.
Features
· Miniature Construction
· Power Consumption of 3.5mA at VCC=5V for Energy Efficiency
· Single Current Sourcing Output
· Linear Output for Circuit Design Flexibility
· Low Noise Output Virtually Eliminates the Need for Filtering
· A Stable and Accurate Output
· Temperature Range of -40℃ to 85℃
· Responds to Either Positive or Negative Gauss
Applications
· Current Sensing
· Motor Control
· Position Sensing
· Magnetic Code Reading
· Ferrous Metal Detector
· Vibration Sensing

· Liquid Level Sensin

Transfer Characteristics (VCC=5V)
When there is no outside magnetic field (B=0GS), the quiescent output voltage is one-half the supply
voltage in general.
For TO-92S package, if a south magnetic pole approches to the front face (the side with marking ID)
of the Hall effect sensor, the circuit will drive the output voltage higher. Contrary, a north magnetic pole
will drive the output voltage lower. The variations of voltage level up or down are symmetrical. Due to
SOT-23-3 is reversed packaging with TO-92S, so the magnetic performance is also reversed. Therefor, if
the reversed magnetic pole approches to the front face (the side with marking ID), the output is the same
as TO-92S package.
Greatest magnetic sensitivity is obtained with a supply voltage of 6V, but at the cost of increased supply
current and a slight loss of output symmetry. So, it is not recommended to work in such condition unless
the output voltage magnitude is a main issue. The output signal can be capacitively coupled to an
amplifier for boosting further if the changing frequency of the magnetic field is high.