1. LM324ADR2G Substitution Conclusion The LM324ADR2G can serve as a highly compatible drop-in replacement for the original LM324M. The differences are as follows: its input offset voltage (2 mV) is slightly higher than that of the original part (1.5 mV), and its total quiescent current (1.5 mA) is also marginally greater than the original (1 mA). In applications with extremely stringent DC precision (such as precision measurement amplification) or very low power consumption, a reassessment of system error and power budget may be necessary. However, for the vast majority of general‑purpose applications—including amplification, filtering, and comparator circuits—key parameters such as supply voltage range, output current, and gain‑bandwidth product (1 MHz) remain identical. Moreover, both devices are offered in the same wide‑body SOIC/SOP compatible package. Therefore, the LM324ADR2G can be directly substituted without affecting the fundamental functionality of the circuit.