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A44E / AH44E Hall Effect Sensor — Omnipolar Magnetic Switch
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A44E / AH44E Hall Effect Sensor — Omnipolar Magnetic Switch
The A44E (AH44E) is an omnipolar Hall Effect sensor that activates in the presence of either a North or South magnetic pole. This makes it ideal for applications where magnet orientation cannot be guaranteed, such as reed switch replacements, gear tooth sensing, and general-purpose proximity detection.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (Vcc) | 4.5V – 24V DC |
| Output Type | Open-Collector (Active Low) |
| Operate Point (BOP) | ±35 Gauss (typical) |
| Release Point (BRP) | ±15 Gauss (typical) |
| Output Current (Sink) | 25 mA max |
| Operating Temperature | -40°C to +85°C |
| Package | SIP-3 (3-pin inline) |
| Sensing Type | Omnipolar (North & South poles) |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Supply Voltage (4.5V – 24V) |
| 2 | GND | Ground |
| 3 | OUT | Open-Collector Output (Active Low) |
Key Features
- Omnipolar operation — responds to both North and South magnetic poles
- Open-collector output — easy pull-up resistor interfacing
- Wide supply voltage range: 4.5V to 24V
- Drop-in replacement for reed switches
- Compatible with Arduino, STM32, PIC, ESP32
Applications
- Reed switch replacement in industrial systems
- Gear tooth and speed sensing
- Door and window position detection
- Brushless DC motor commutation
- General-purpose proximity switching