55100-3H-02-A
Omnipolar Hall effect position sensor with digital output. 3.3V-24V operating range, AEC-Q100 qualified for automotive applications.
Product Overview
Description
The Littelfuse 55100-3H-02-A is a high-performance omnipolar Hall effect position sensor designed for automotive and industrial applications. Featuring a wide operating voltage range of 3.3V to 24V, this sensor provides reliable position detection with digital output.
The omnipolar configuration allows the sensor to respond to either magnetic pole, simplifying magnet design and installation. With high magnetic sensitivity and fast response time, this sensor is ideal for speed sensing, position detection, and proximity applications.
AEC-Q100 Grade 0 qualified, the 55100-3H-02-A operates reliably from -40°C to +150°C, making it suitable for under-hood automotive applications. The compact SOT-23 package enables space-constrained designs.
Product Series
55100 Series
Primary Application
Position sensing
Key Features
- Omnipolar operation (responds to both poles)
- Wide 3.3V to 24V operating voltage
- Digital open-drain output
- High magnetic sensitivity
- Fast < 10µs response time
- AEC-Q100 Grade 0 qualified
- Compact SOT-23 package
- Reverse polarity protection
Specifications
| operatingVoltage | 3.3V - 24V |
|---|---|
| outputType | Digital (Open Drain) |
| sensorType | Omnipolar |
| operatePoint | 15mT typical |
| releasePoint | 10mT typical |
| responseTime | < 10µs |
| operatingTemperature | -40°C to +150°C |
| package | SOT-23 |
| qualification | AEC-Q100 Grade 0 |
Applications
Position sensing
Electronic system design
Speed detection
Electronic system design
Proximity sensing
Electronic system design
Door/latch detection
Electronic system design
Motor commutation
Motor drive and control systems
Flow sensing
Electronic system design
FAE Expert Insights
"The 55100-3H-02-A is my go-to Hall effect sensor for automotive position sensing applications. The omnipolar configuration is particularly useful - you don't have to worry about magnet orientation, which simplifies assembly and reduces field failures. The wide 3.3V to 24V operating range provides flexibility for various automotive systems. I particularly appreciate the AEC-Q100 Grade 0 qualification - this means it's tested for under-hood temperatures up to 150°C, which is essential for engine compartment applications. The 10µs response time is fast enough for most speed sensing and position detection needs. For design-in, I recommend using a pull-up resistor (typically 10kΩ) on the open-drain output. The SOT-23 package is compact but still manageable for production assembly. One application tip: ensure adequate magnetic field strength at the sensor - I typically design for at least 20mT to provide margin over the 15mT operate point."
Versatile omnipolar Hall sensor with AEC-Q100 Grade 0 qualification
— Michael Chen, BeiLuo
Frequently Asked Questions
What is the difference between unipolar, bipolar, and omnipolar Hall sensors?
Hall effect sensors are classified by their magnetic response: (1) Unipolar - Responds to only one magnetic pole (typically South). When the South pole approaches, output switches. When removed, output returns to original state. Simple but requires correct magnet orientation; (2) Bipolar - Responds to both poles but with opposite output states. South pole may turn output ON, North pole turns output OFF. Requires both poles for operation; (3) Omnipolar - Responds to either magnetic pole with the same output state. Both North and South poles trigger the same output transition. Most versatile as magnet orientation doesn't matter. For the 55100-3H-02-A (omnipolar): use when magnet orientation is unknown or variable, simplifies assembly, reduces field failures due to incorrect installation. Omnipolar sensors are ideal for position sensing, speed detection, and proximity applications where installation flexibility is important.
Use omnipolar for most applications due to versatility. use unipolar when pole-specific detection is needed. Use bipolar when direction detection is required.