SKU: SENS-0956
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Honeywell SS549AT Unipolar Hall Effect Sensor - SOT-89-3 SMD, 3.8-30Vdc, 180-420 G

₹589.00 (Inclusive of all taxes)
Out of Stock

The Honeywell SS549AT is a unipolar board-mount Hall effect sensor in an SOT-89-3 package, featuring a temperature-compensated quad-Hall IC design for stable magnetic field sensing from 180 G to 420 G. It operates from 3.8V to 30V DC with an open-collector digital output, making it compatible with a wide range of industrial control systems and microcontrollers.

Features

  • Quad-Hall IC design minimizes mechanical stress for enhanced stability.
  • Temperature-compensated for reliable operation from -40°C to +150°C.
  • Wide supply voltage range: 3.8 Vdc to 30 Vdc.
  • Digital, open-collector sinking output for easy interface with logic circuits.
  • Unipolar magnetic sensing with an operating range of 180 G to 420 G.

Out of stock

Description

The Honeywell SS549AT Hall effect sensor utilizes a sophisticated quad-Hall element integrated circuit. This design inherently cancels out the effects of package stress and thermal gradients, providing a stable and precise magnetic switchpoint over its entire operating temperature range. The sensor is configured for unipolar operation, activating in the presence of a sufficient south-pole magnetic field.

Its broad 3.8V to 30V supply voltage compatibility allows for direct integration into 5V, 12V, or 24V industrial systems without requiring a voltage regulator. The digital output sinks up to 8.7 mA, enabling direct drive of opto-isolators, microcontroller inputs, or small relays for speed sensing, position detection, and motor control applications.

Key Features

  • Advanced quad-Hall IC architecture for superior stress immunity and signal integrity.
  • Precision temperature compensation ensures consistent performance across extreme environments (-40°C to +150°C).
  • High-voltage tolerant design supports direct connection to automotive and industrial power rails.
  • Open-collector digital output provides flexible interface options with pull-up resistors.
  • Robust SOT-89-3 surface-mount package for reliable PCB integration.
  • Optimized for unipolar magnetic sensing with a defined 180 G to 420 G operating window.
  • High-value build suitable for mission-critical speed and position feedback systems.

Applications

  • Speed and RPM sensing in industrial encoders and tachometers.
  • Brushless DC (BLDC) motor commutation and fan control.
  • Position detection for automotive systems (e.g., window lift, convertible roof).
  • Flow-rate sensing in fluid management and metering pumps.
  • Robotics joint limit and proximity sensing.

Technical Specifications

Manufacturer Part NumberSS549AT
BrandHoneywell
Sensor TypeUnipolar Hall Effect
Package / CaseSOT-89-3 (SMD/SMT)
Operating Supply Voltage3.8 Vdc to 30 Vdc
Nominal Operating Voltage12 Vdc
Magnetic Operating Range180 G to 420 G
Output TypeDigital, Open Collector
Max Output Current8.7 mA (sinking)
Operating Temperature-40°C to +150°C

Frequently Asked Questions

What is the operating voltage range for the Honeywell SS549AT sensor?

The SS549AT features a very wide supply voltage range from 3.8 Vdc to 30 Vdc. This allows it to be powered directly from common system voltages like 5V, 12V, or 24V without requiring an additional voltage regulator, simplifying integration into automotive and industrial control panels.

What type of magnetic field does this unipolar Hall sensor detect?

The SS549AT is a unipolar sensor, meaning it is designed to activate (switch its output) specifically in the presence of a sufficient south-pole magnetic field strength within its 180 G to 420 G operating range. It will not respond to a north pole, making it suitable for simple proximity or speed sensing applications.

How do I interface the open-collector output with a microcontroller?

The digital open-collector output requires an external pull-up resistor to your logic voltage (e.g., 3.3V or 5V). Connect the sensor's V+ to your supply (3.8-30V), GND to ground, and the output pin to your microcontroller's digital input pin via a 1kΩ to 10kΩ pull-up resistor. The output will sink to ground (logic LOW) when activated.

What is the benefit of the quad-Hall IC design?

The quad-Hall design uses four Hall elements within the IC. This configuration allows the sensor to average their signals, effectively canceling out errors induced by mechanical package stress and thermal gradients. This results in a more stable and precise magnetic switchpoint over the entire -40°C to +150°C temperature range.

Package Includes

  • 1 x Honeywell SS549AT Hall Effect Sensor

Additional Information

Weight 0.011 kg
Dimensions 0.6 × 0.8 × 0.3 cm