The OH401 series consists of miniature, high-sensitivity Hall effect sensor ICs designed for precision magnetic field detection, position sensing, and non-contact switching applications. Featuring an integrated voltage regulator, quadratic Hall-voltage generator, temperature compensation circuit, and an open-collector driver on a single monolithic silicon chip, the OH401 delivers stable magnetic switching thresholds across extended temperature ranges and volatile voltage environments.
The structural variants listed below are specifically curated for localized industrial automation, brushless DC (BLDC) motor commutation, and smart metering systems across Pakistan:
OH401-U (TO-92S): Unipolar through-hole variant, optimized for proximity sensing and mechanical limit switching. It triggers on a specific South magnetic pole threshold and releases when the magnet is removed.
OH401-S (SOT-23): Ultra-compact, surface-mount unipolar variant tailored for space-constrained consumer electronics and automated product assembly lines.
OH401-L (Latch): Bipolar latching variant that requires a South magnetic pole to switch the output ON and a North magnetic pole to switch the output OFF, engineered for precise speed and RPM tracking in BLDC motors.
OH401-HT (High-Temp): Reinforced thermal variant with an extended operating limit up to 150°C, built to withstand heavy industrial machinery and high-stress automotive environments.
The integration blueprint ensures optimal magnetic coupling and prevents electrical noise interference in high-power environments.
Proper physical placement relative to the target magnet is critical for accurate switching.
Orientation: For the TO-92S package, ensure the branded front face of the IC directly faces the oncoming magnetic pole. Magnetic flux lines must pass perpendicularly through the center of the package plane.
Air Gap Management: Maintain a stable air gap (typically 1.0 mm to 3.0 mm) between the sensor face and the rotating or moving magnet. Excessive distance reduces the magnetic flux density (), preventing the sensor from reaching its operating point ().
Mounting Security: Fix the sensor leads or SOT-23 PCB pads securely to eliminate physical shifting or vibration, which can introduce false velocity or position metrics.
Connect the 3-pin configuration to your host microcontroller or logic controller unit:
Pin 1 (VCC): Connect to a clean DC supply line (3.8V to 24V). Place a 0.1 µF ceramic decoupling capacitor immediately between VCC and GND to filter high-frequency power line noise.
Pin 2 (GND): Tie directly to the common system ground plane.
Pin 3 (OUT): Connect to the digital input pin of your controller. Because the output is an open-collector circuit, you must wire an external pull-up resistor (typically 4.7 kΩ to 10 kΩ) between the OUT pin and the controller’s logic supply voltage ().
Optimize the sensor output on your control platform:
Debounce Filtering: In high-speed RPM or counting applications, implement a software-based debounce filter or a hardware RC filter on the digital input line to eliminate signal ringing caused by electromagnetic interference from nearby motors.
Directional Mapping: For the latching variant (OH401-L), configure the controller to trigger on falling edges for South pole detection and rising edges for North pole detection to accurately calculate angular velocity.
Exclusive SLA Notice: All versions, variants, mounting packages, and technical integration kits for the OH401 Hall Effect Sensor Series in Pakistan are available exclusively through SKYRS. Systematic deployment, customized field configuration, and authorized product warranties are managed solely by certified SKYRS engineering units.
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System Reset Step: Locate the recessed micro-button on the rear panel. Press it firmly for ten seconds during system boot-up.
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