SL1303SE Omnipolar Hall Sensor ：Nanoamp Ultra-Low Power Magnetic Detection Switch

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2026-08-27 54

For TWS Bluetooth headsets, wearable devices, IoT terminals and battery-powered portable products, non-contact magnetic detection imposes strict requirements on sensor standby power consumption, assembly convenience and miniaturization. The SL1303SE is an omnipolar micro-power Hall magnetic sensor developed by Slkor Semiconductor. Adopting an intermittent scanning detection mechanism, it achieves an ultra-low average operating current of 160nA. Triggered by both N-pole and S-pole magnets without polarity identification, it is packaged in a compact SOT-23-3L form factor. It serves as a cost-effective domestic sensor solution for magnetic switch detection and position judgment in battery-powered products.

1. Core Electrical Parameters

Polarity: Omnipolar (N/S pole both triggerable) Supply Voltage (VDD): 5.5V Average Operating Current (IDD): 160nA Scanning Frequency: 50Hz Package: SOT-23-3L

2. Core Product Advantages

2.1 Omnipolar Induction Simplifies Production Assembly

As an omnipolar switching sensor, the SL1303SE can trigger signal output whether approached by an N-pole or S-pole magnet. There is no need for strict magnetic pole calibration during product assembly, which greatly reduces production difficulty and defect rates. It is highly suitable for mass manufacturing of consumer electronic products.

2.2 Nanoamp-level Ultra-Low Power Extends Battery Life

The chip adopts a periodic sleep-scan operating mode. At a 50Hz scanning frequency, the typical operating current is only 160nA with extremely low static power consumption. It effectively minimizes standby power loss of the whole device and significantly prolongs the service life of products powered by button batteries and small lithium batteries, perfectly adapting to long-standby IoT and portable hardware.

2.3 Compact SOT-23-3L Package Saves PCB Space

Packaged in industry-standard SOT-23-3L surface-mount package, the sensor features tiny size and excellent SMT compatibility. It fits electronic devices with compact PCB layout and supports product thinning and miniaturization design. With stable supply, it is ideal for mass replacement and project selection.

2.4 50Hz Scanning Frequency Optimized for Low-Speed Detection

The 50Hz sampling scanning rate is specially optimized for low-speed magnetic detection scenarios such as switch opening/closing and position recognition. Balancing ultra-low power consumption and detection reliability, it stably identifies the approaching and departing states of magnets and outputs clean and stable signals.

2.5 Mature Process with Excellent Batch Consistency

Based on Slkor’s mature semiconductor manufacturing process, the chip features stable trigger threshold, strong anti-interference capability and wide voltage adaptability, matching mainstream supply voltage of consumer electronics. It can directly replace imported omnipolar ultra-low-power Hall sensors with equivalent specifications.

3. Main Application Fields

The SL1303SE is widely applied in various battery-powered electronic products, including TWS headset cover opening detection, laptop and tablet flip magnetic detection, smart lock position sensing, door magnetic switches, wearable devices, smart toys, flow meters, small home appliance magnetic switches, low-power IoT terminals and other non-contact position detection scenarios.

4. Engineering Design Guidelines

Power Supply Design: The maximum rated supply voltage is 5.5V. Add a 0.1μF decoupling capacitor near the power pin for filtering to suppress power noise and ensure stable operation.

Power Consumption Characteristics: The device works in intermittent scanning mode with a fixed 50Hz frequency. It is not applicable for high-speed magnetic field changes and is only recommended for low-speed position and switch detection applications.

Magnet Matching: Select a reasonable magnetic field strength to ensure the magnetic field reaches the trigger threshold when the magnet approaches. Excessive distance will cause detection failure.

PCB Layout: Keep the sensor away from high-current coils and strong magnetic components to avoid false triggering caused by external magnetic interference. Simplify wiring to reduce parasitic disturbance.

5. Product Summary

The Slkor SL1303SE is a high-performance omnipolar Hall sensor integrating omnipolar triggering, 160nA nanoamp-level ultra-low power consumption, 50Hz fixed scanning frequency and compact SOT-23-3L package. It eliminates magnetic pole identification requirements, greatly simplifies assembly procedures, and focuses on non-contact magnetic detection for battery-powered devices. With stable performance and cost advantages, it is the preferred domestic magnetic switching device for Bluetooth headsets, wearable devices and low-power IoT hardware.

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