2. TS514IDT Substitution Conclusion Conditional substitution is possible with acceptance of certain performance compromises, but it mandates rigorous circuit evaluation and testing. The speed characteristics of the TS514IDT (gain bandwidth product of 3 MHz, slew rate of 1.5 V/µs) are in the same order of magnitude as, though slightly inferior to, the original part (2 MHz, 3.4 V/µs). The primary limitations are its input bias current (50 nA), which, while better than the LM2902, remains approximately ten thousand times higher than the J-FET original part, leading to potential accuracy degradation in high-impedance source applications. Simultaneously, its output drive capability (23 mA) is only about one-quarter that of the original part (80 mA), which may be insufficient to drive identical loads. Its key advantage is extremely low quiescent power consumption. If the application circuit does not demand high input impedance (i.e., the source impedance is low) and the load is light, this device can be considered as a potential option. However, it is critical to verify that the system still meets requirements for DC accuracy, load drive capability, and dynamic response.