1. LM324EDR2G Substitution Conclusion The LM324EDR2G cannot serve as a direct replacement for the LF347D and should only be considered with caution in certain low-performance general-purpose applications. Key differences include: First, the amplifier types differ: the LF347D is a J‑FET input amplifier with an extremely low input bias current (50 pA), making it suitable for circuits sensitive to input current, such as high‑impedance sensor signal acquisition. In contrast, the LM324EDR2G is a general‑purpose bipolar amplifier with an input bias current (90 nA) three orders of magnitude higher; direct substitution could significantly increase signal error at high‑impedance nodes. Second, bandwidth and slew‑rate differences: the LF347D offers a 3 MHz gain‑bandwidth product and 13 V/µs slew rate, which suits medium‑ to high‑speed signal processing. The LM324EDR2G’s bandwidth and slew rate are considerably lower (typically around 1 MHz and 0.5 V/µs); substitution may lead to high‑frequency signal distortion or insufficient response speed. Third, supply voltage ranges differ: the LF347D supports a wider supply range (±18 V), while the LM324EDR2G has a maximum operating voltage of 32 V (single‑supply or ±16 V), which may limit its use in higher‑voltage applications. Substitution may be considered only if the circuit operates at low frequency, uses a single supply, is intended for non‑precision measurement, and is insensitive to input current; otherwise, a full system performance reassessment is required.