Hall-effect current sensors are useful when isolation and low loss are required, but their architectures differ significantly. Integrated conductor devices simplify layout and reduce parasitic effects in compact power supplies. External-core solutions can support high current but require attention to saturation, hysteresis, and assembly tolerance. Coreless differential approaches can reduce size and improve stray-field rejection. Allegro's official materials highlight high-voltage design needs, isolation ratings, low conductor resistance, and high bandwidth. Engineers should first define peak current, continuous current, insulation requirements, protection response time, and thermal limits before choosing package, output interface, and error budget.