General Description
AH173 is a single-digital-output Hall-effect sensor with pull-up resistor for high temperature operation. The device includes an on-chip Hall voltage generator for magnetic sensing, an amplifier to amplify Hall voltage, and a comparator to provide switching hysteresis for noise rejection, and an output driver with a pull-up resistor (Rpu). An internal band-gap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range. While the magnetic flux density (B) is larger than operate point (Bop), the OUT pin turns on (low). If B moves toward release point (Brp), the OUT pin is latched “on” state prior to B < Brp. When B < Brp, the OUT pin goes into “off ” state.

Features
• Bipolar Hall Effect Latch Sensor
• 3V to 20V DC Operation Voltage
• Built-in Pull-Up Resistor
• 25mA Output Sink Current
• Operating Temperature: −40°C ~ +125°C
• Lead Free Finish/RoHS Compliant for Lead Free products (Note 1)
• Lead Free Package: SIP-3L, SC59-3L
• Green Package: SC59-3L

Applications
• Rotor Position Sensing
• Current Switch
• Encoder
• RPM Detection