2. TL072ACDT Substitution Conclusion Substitution can be cautiously evaluated under specific conditions, but involves critical performance trade‑offs. As a JFET‑input op‑amp, the TL072ACDT offers ultra‑low input bias current (20 pA), which is far superior to the BJT‑input original part (30 nA). This is a major advantage for high‑impedance signal sources such as photoelectric sensors, and its slew rate (16 V/µs) is higher. However, its input offset voltage (3 mV) is 15 times higher than that of the original part (200 µV)—the most critical difference. In applications requiring high DC accuracy, such as precision measurement or instrumentation amplification, this would directly result in unacceptable error. Additionally, its gain‑bandwidth product (4 MHz) is lower. Substitution should be considered only when the circuit is extremely sensitive to input bias current, when the high offset voltage can be overcome by external nulling or other means (or when DC accuracy is not critical to the application), and when cost or automotive‑grade certification is a requirement. Otherwise, it is not recommended.