LM258AYDT Substitution Conclusion The LM258AYDT cannot serve as a direct substitute for the TLE2061IDRG4 in most applications due to significant differences in key performance parameters, which may degrade system performance. The distinctions include: amplifier type (J-FET vs. Standard), where the TLE2061 offers an extremely low input bias current (4 pA), making it suitable for precision applications such as high-impedance sensor interfaces, whereas the LM258’s higher input bias current (20 nA) may introduce error; slew rate (3.4 V/µs vs. 0.6 V/µs) and gain-bandwidth product (2 MHz vs. 1.1 MHz) differences indicate that the TLE2061 is better suited for high-speed signal processing, while the LM258 responds more slowly; output current capability (80 mA vs. 40 mA) affects drive strength; and supply voltage range (7–36 V vs. 3–30 V) shows the TLE2061 is superior in higher-voltage applications. Additionally, the LM258 is a dual-channel device and complies with the automotive-grade AEC-Q100 standard, making it suitable for cost-sensitive or automotive electronics. However, substitution would be limited if the original design relies on single-channel operation and high performance. Overall, the LM258 may only be considered as a replacement in scenarios with relaxed performance requirements, where automotive qualification or dual-channel functionality is needed. Otherwise, retaining the original part is recommended.