1. AS324AMTR-G1 Substitution Conclusion The AS324AMTR-G1, as a general-purpose operational amplifier, cannot directly replace the JFET-input AD8684ARZ in most critical parameters, resulting in low substitution feasibility. Key differences include: input bias current (20nA for AS324, significantly higher than 6pA for AD8684), which would introduce substantial error in high-impedance sensor or precision integrator circuits; input offset voltage (2mV for AS324 versus 350µV for AD8684), leading to severely degraded DC accuracy; and quiescent current (1mA per channel for AS324, far exceeding 210µA per channel for AD8684), making it unsuitable for low-power designs. Furthermore, the AD8684 offers well-defined dynamic performance with a slew rate of 9V/µs and a gain-bandwidth product of 3.5MHz, while the AS324 does not specify slew rate, potentially limiting high-frequency response. Substitution may be cautiously considered only in general-purpose signal conditioning applications requiring wide supply voltage range (3–36V) or higher output drive current (40mA), but with the trade-off of compromised accuracy and power efficiency.