Product Description:

The SS451CTG4 is a bipolar Hall-effect latch produced by Danaher for use with the Slo-Syn Synchronous Motors series. It serves as a solid-state position detector that switches each time the motor’s rotor magnetic field crosses its sensing plane, supplying a clean digital edge to drive controllers that manage commutation and velocity feedback in automated machinery. This device accepts a supply rail of up to 24 Vdc, so it can be connected directly to common control-system power buses without additional regulation.

When active, its output stage can sink as much as 20 mA, allowing direct connection to optoisolators or microcontroller inputs that need moderate current for reliable logic-level recognition. The latch responds to changing magnetic polarity at rates up to 100 kHz; this high response frequency supports high-speed motors where pole crossings occur within microseconds. Output is provided through an open-collector transistor, allowing pull-up resistors to be selected for compatible logic families or wired-OR networks. Internally, the sensor stores its magnetic state until the opposite polarity is applied, providing deterministic switching through its bipolar latch function and preventing chatter in noisy magnetic environments.

Thermal tolerance reaches 150 °C, allowing placement near windings or stators that experience elevated temperatures during continuous duty cycles. Even when loaded, the output transistor saturates at only 0.4 Vdc, minimizing power dissipation and heat buildup inside densely packed drive electronics. External terminations are simplified by a 3-pin lead frame that brings the supply, ground, and output connections to a single header. Magnetic flux is converted into an electrical signal through a Hall-effect sensing element that is immune to mechanical wear. The package supports surface-mount installation, enabling automated placement on multilayer drive or feedback boards without secondary operations.