1. LM258DRG4 Substitution Conclusion Not a direct replacement. Although both are dual‑channel general‑purpose op‑amps with pin‑compatible packages, the LM258DRG4 exhibits substantial performance gaps compared to the LT1213 in key parameters: its gain‑bandwidth product (700 kHz vs. 28 MHz) and slew rate (0.3 V/µs vs. 12 V/µs) are orders of magnitude lower, rendering it completely incapable of handling mid‑to‑high‑frequency or fast‑slewing signals that may be present in the original design, which would result in severe signal distortion; its input offset voltage (3 mV vs. 150 µV) is 20 times higher, introducing significant error in applications requiring high DC accuracy (e.g., sensor amplification); moreover, its lower output drive current (40 mA vs. 50 mA) may be insufficient to drive the existing load. The LM258DRG4 is suitable only for very low‑bandwidth, low‑speed, and low‑precision applications. Direct substitution would severely degrade circuit performance or cause functional failure.