1. BU7244SF-E2 Substitution Conclusion The BU7244SF-E2 can be substituted in low-power, low-voltage, and high-input-impedance applications; however, critical differences exist in dynamic performance, output drive capability, and package dimensions, requiring careful evaluation. The primary deviations are as follows: First, its slower slew rate (0.4 V/µs) and lower gain bandwidth product (900 kHz) result in reduced bandwidth and transient response when handling fast or high-frequency small signals compared to the original part. Second, its maximum output current (12 mA) is only 40 % of the original, severely limiting its ability to drive heavy loads such as multiple LEDs or small motors. Third, while its lower input bias current (1 pA) and wider operating voltage range down to 1.8 V are advantageous for battery-powered high-impedance sensor signal conditioning, its package width (4.40 mm) is slightly larger than the original (3.90 mm), which may cause installation issues in densely populated PCB layouts.