SS451ET Danaher
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The Danaher SS451ET is a Hall Effect sensor from the Slo-Syn Synchronous Motors series with a through hole mounting style and a flat TO-92 package. It operates over a supply voltage range from 4.5 to 24 Vdc, has a maximum output current of 20 mA, and features an open collector output configuration with three pins. The device supports operating temperatures from -40 °C to 150 °C and offers a response time of 3 microseconds with a bipolar latching switch type.
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Product Description:
The SS451ET is a magnetic sensing component manufactured by Danaher for the Slo-Syn Synchronous Motors series. It is a Hall-effect device that detects alternating north-south magnetic fields and converts them into digital level changes for motor commutation or position monitoring in industrial automation. The device is intended to be soldered directly onto a control PCB so it can reside close to the moving magnet or magnetized gear that it monitors, providing noncontact feedback that eliminates mechanical wear and simplifies high-speed sequencing tasks. When paired with Slo-Syn drive electronics, the sensor supplies the timing signals needed to synchronize step advances, reduce resonance, and implement stall detection.
Electrically, the SS451ET accepts a regulated input as low as 4.5 VDC and remains stable up to 24 VDC, allowing a single logic or auxiliary rail to power the device. Its output transistor can draw as much as 20 mA, which is sufficient to actuate optoisolators or pull-up-driven microcontroller inputs. The sensing core uses the Hall-effect principle, so switching occurs when opposite magnetic poles are present rather than when magnetic flux simply rises above a threshold. A response time of 3 µs supports edge detection on fast-rotating shafts and helps control systems register rapid magnetic transitions without missing signal changes.
The sensor operates from -40 °C to 150 °C, allowing it to function near hot motor laminations or in outdoor equipment exposed to winter temperatures. The output stage uses an open-collector output, enabling wired-OR bus arrangements and compatible pull-up levels across different logic families. A flat TO-92 package with three leads supports through-hole mounting and simplifies manual insertion or wave soldering. Its three-pin footprint fits common digital sensor sockets and allows the component to be positioned close to the monitored magnetic target. Bipolar latching action keeps the output in its current state until a magnetic field with the opposite polarity arrives, providing stable switching as alternating poles pass the sensing face.
