Description
The 41F-family Bipolar Hall Effect Sensor is a digital magnetic position sensor designed for non-contact detection of magnetic fields, rotor position, and speed measurement. It integrates a Hall voltage generator, comparator, Schmitt trigger (for noise rejection), and an open-collector output in a single compact package . Unlike unipolar sensors that respond to only one magnetic pole, bipolar (latched) sensors require alternating North and South poles to switch states—making them ideal for brushless DC (BLDC) motor commutation, speed sensing, and revolution counting .
The sensor operates from a wide supply voltage range (typically 4.5V–24V for standard parts, with some variants extending to 3.0V–60V) and features an open-collector output capable of sinking 20–25mA . The built-in reverse polarity protection and wide operating temperature range (-40°C to +150°C) make it suitable for automotive and industrial environments .
Critical limitations: The 41F family is not a single standardized part—model numbers like SS41F, SH41, and S41 may have different magnetic thresholds, voltage ranges, and package options depending on the manufacturer. The output is digital (HIGH/LOW) based on magnetic pole presence, not analog field strength. Do not use for precision magnetic field measurement—it is a switching sensor, not a linear Hall sensor.
Features
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Bipolar (Latched) Operation: Requires alternating North and South magnetic poles to switch states; ideal for BLDC motor commutation and speed sensing .
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Digital Open-Collector Output: Sinks 20–25mA, directly compatible with microcontroller GPIO and logic circuits .
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Wide Operating Voltage: Typically 4.5V–24V (verify your specific variant; some extend to 3.0V–60V) .
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Reverse Polarity Protection: Internal diode prevents damage from accidental supply reversal .
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Wide Temperature Range: -40°C to +150°C for automotive and industrial applications .
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Schmitt Trigger Hysteresis: Built-in hysteresis rejects noise and ensures clean switching .
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Compact Package: Available in TO-92-style (SIP-3L) and some SOT-23 variants .
Technical Specifications
| Parameter | Specification (41F-family typical) |
|---|---|
| Sensor Type | Bipolar (latched) Hall effect switch |
| Supply Voltage | 4.5V–24V (verify; some variants 3.0V–60V) |
| Output Type | Digital, open-collector |
| Output Current (Sink) | 20–25mA |
| Operating Temperature | -40°C to +150°C |
| Package | TO-92-style (SIP-3L) standard; SOT-23 on some variants |
| Magnetic Operate Point (Bop) | ~45 Gauss (varies by manufacturer) |
| Magnetic Release Point (Brp) | ~-45 Gauss (varies by manufacturer) |
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