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SS41F Hall Effect Sensor — Unipolar Magnetic Switch
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SS41F Hall Effect Sensor — Unipolar Magnetic Switch
The SS41F is a unipolar Hall Effect sensor IC designed to detect the presence of a magnetic field. It features an open-collector output, making it ideal for interfacing with microcontrollers like Arduino, STM32, and PIC. Widely used in position sensing, RPM measurement, and proximity detection applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (Vcc) | 3.8V – 24V DC |
| Output Type | Open-Collector (Active Low) |
| Operate Point (BOP) | ~70 Gauss (typical) |
| Release Point (BRP) | ~30 Gauss (typical) |
| Output Current (Sink) | 25 mA max |
| Operating Temperature | -40°C to +85°C |
| Package | SIP-3 (3-pin inline) |
| Sensing Type | Unipolar (South pole only) |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Supply Voltage (3.8V – 24V) |
| 2 | GND | Ground |
| 3 | OUT | Open-Collector Output (Active Low) |
Key Features
- Unipolar operation — activates with South pole magnetic field
- Open-collector output — easy pull-up resistor interfacing
- Wide supply voltage range: 3.8V to 24V
- Compact SIP-3 package for PCB and breadboard use
- Compatible with Arduino, STM32, PIC, Raspberry Pi
Applications
- RPM and speed measurement (motor/wheel sensing)
- Position and proximity detection
- Brushless DC motor commutation
- Door/window open-close detection
- Industrial automation and robotics