Description
The SS49E (often sold as S49E) is a linear (analog) Hall effect sensor designed for precise magnetic field measurement. Unlike digital Hall switches that only indicate the presence or absence of a magnet, the SS49E outputs a continuous analog voltage that varies in proportion to the magnetic field strength. At zero magnetic field, the output sits at approximately half the supply voltage (VCC/2). When a South pole approaches the marked face, the output voltage rises linearly; when a North pole approaches, the output voltage falls linearly .
This linear response makes the SS49E suitable for applications requiring quantitative magnetic field measurement, such as position sensing, current sensing, motor control, and vibration detection . The sensor integrates low-noise circuitry, eliminating the need for external filtering, and includes thin-film resistors for temperature stability . It operates from a 2.7V to 6.5V supply with a typical current consumption of 6mA, and is available in a standard TO-92S (SIP-3L) package .
Critical limitations: The output is analog, requiring connection to an ADC input, not a digital GPIO. The sensor responds to both magnetic polarities (positive and negative Gauss), with the output swinging above and below VCC/2 . The supply voltage must not exceed 6.5V (absolute maximum is 8.0V or 10.5V depending on the source)—do not connect to 12V or 24V systems without regulation . Genuine Honeywell parts and compatible clones (SL49E, ES49E) exist; verify the manufacturer with your supplier.
Features
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Linear Analog Output: Continuous voltage proportional to magnetic field strength for quantitative measurement .
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Responds to Both Magnetic Poles: Output rises with South pole, falls with North pole; quiescent at VCC/2 .
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Wide Supply Range (2.7V–6.5V): Compatible with 3.3V and 5V systems .
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Low Noise Output: Integrated circuitry eliminates the need for external filtering .
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Temperature-Stable: Thin-film resistors improve accuracy over the operating range .
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Compact TO-92S Package: 3-pin through-hole for easy breadboard and PCB mounting .
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Wide Operating Temperature: -40°C to +100°C (Honeywell spec) or -40°C to +85°C (some clones) .
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RoHS Compliant: Meets environmental regulations .
Technical Specifications
| Parameter | Specification (SS49E / S49E) |
|---|---|
| Sensor Type | Linear (analog) Hall effect |
| Supply Voltage | 2.7V – 6.5V DC |
| Supply Current | ~6mA typical |
| Quiescent Output (0 Gauss) | VCC/2 (typically 2.5V at 5V supply) |
| Sensitivity | ~1.4 mV/Gauss (Honeywell); ~1.8 mV/Gauss (some clones) |
| Magnetic Field Range | ±1000 Gauss typical |
| Output Type | Analog voltage (ratiometric to VCC) |
| Package | TO-92S (SIP-3L), 3 pins |
| Operating Temperature | -40°C to +100°C (Honeywell); -40°C to +85°C (clones) |
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