SS40F Hall-effect Digital Position Sensor TO-92S

SS40F Hall-effect Digital Position Sensor TO-92S is a high-performance, bi-polar Hall-effect integrated circuit designed to provide reliable magnetic sensing in a compact package. This sensor utilizes a specialized high-sensitivity element to detect the presence of a magnetic field and provides a clear digital output signal. Furthermore, the SS40F operates across a wide supply voltage range, making it highly compatible with various logic levels and industrial power supplies. The device features an open-collector output, which allows you to interface it directly with microcontrollers or logic circuits. Consequently, this sensor offers an ideal solution for brushless DC motor commutation, speed detection, and non-contact position sensing where durability and precision are paramount.

Key Features:

• High Sensitivity: This bi-polar sensor triggers reliably at low magnetic flux densities, ensuring accurate detection even with smaller or weaker magnets.
• Wide Operating Voltage: The device supports a broad voltage range from 4.5 V to 24 V, allowing integration into both battery-powered and industrial systems.
• Digital Open-Collector Output: The output stage easily sinks current to drive external loads or interface with pull-up resistors for standard digital logic.
• Reverse Polarity Protection: An internal protection circuit prevents damage if you accidentally reverse the power supply leads during installation.
• Compact TO-92S Package: The small, flat through-hole package simplifies mounting in tight spaces and provides excellent thermal stability.

Technical Specifications:

• Supply Voltage (V_cc): 4.5 V_DC to 24 V_DC
• Output Type: Digital (Sink / Open-Collector)
• Maximum Output Current: 20 mA
• Magnetic Type: Bi-polar (Responds to North and South poles)
• Operating Frequency: 0 to 100 kHz
• Operating Temperature Range: −40°C to +125°C
• Magnetic Release Point (Brp): Typically −115 Gauss
• Magnetic Operate Point (Bop): Typically +115 Gauss

Mechanical Specifications:

• Package Type: TO-92S (Flat, 3-Lead)
• Mounting: Through-Hole (THT)
• Lead Frame: Tinned Copper Lead
• Enclosure Material: Molded Plastic Case

Dimensions:

• Body Height: ≈ 3.0 mm
• Body Width: ≈ 4.0 mm
• Body Thickness: ≈ 1.5 mm
• Lead Length: ≈ 14.5 mm
• Lead Pitch: 1.27 mm

Pinout and Wiring:

• Pin 1 (Supply): Connect to the positive DC power supply (V_cc).
• Pin 2 (Ground): Connect to the circuit ground (GND).
• Pin 3 (Output): Digital output signal. Therefore, you must use a pull-up resistor between Pin 3 and V_cc to establish the high logic state.

Datasheet Reference:

• Download Honeywell SS40F Hall-Effect Sensor Datasheet

Commonly Used in:

• Brushless DC (BLDC) Motors: Detecting rotor position for electronic commutation sequences.
• Magnetic Tachometers: Monitoring the rotational speed of shafts, gears, or wheels.
• Industrial Flow Meters: Tracking the movement of magnetic impellers inside pipes.

Applications:

• Speed and RPM Sensing: Provides high-speed pulse feedback for digital tachometers and encoders.
• Proximity Switching: Acts as a non-contact limit switch for moving mechanical parts.
• Position Detection: Tracks the location of pistons, lids, or doors in automated machinery.
• Current Sensing: Detects magnetic fields generated around conductors in specific power monitoring setups.

Equivalent Models:

• Honeywell SS41: A similar high-performance bi-polar Hall-effect sensor often used in industrial motor control.
• Allegro A1220: A Hall-effect latch that offers comparable magnetic sensitivity and digital output characteristics.
• Melexis US2881: A bi-polar Hall-effect switch providing similar functional specs for position sensing.

Package Includes:

• 1 x SS40F Hall-effect Digital Position Sensor TO-92S