1. LM258P Substitution Conclusion The LM258P can serve as a direct replacement in terms of package and basic functionality, but with significant performance degradation, limiting its suitability to very low‑frequency or DC applications. The key differences lie in the gain‑bandwidth product (700 kHz vs. 1.2 MHz) and slew rate (0.3 V/µs vs. 1.2 V/µs), both notably lower than those of the original part. This reduces the circuit’s speed and capability in processing AC signals, potentially leading to insufficient high‑frequency gain, distortion in large‑signal response, or extended waveform settling time. On the other hand, its advantages include lower input bias current (20 nA) and lower quiescent current (500 µA per channel), making it suitable for power‑sensitive applications where speed is not critical. Substitution may be acceptable if the original circuit operates in low‑frequency domains such as audio or sensor signal conditioning. However, for signal processing above several kilohertz, the LM258P likely cannot meet the performance requirements.