2. TS514IDT Substitution Conclusion This part is a general-purpose standard amplifier, and its core characteristics differ drastically from the original JFET-input amplifier, making substitution largely unfeasible. The most critical discrepancy is its input bias current of 50nA, which is three orders of magnitude greater than the original's 30pA. This renders it completely unsuitable for applications involving high-impedance signal sources (e.g., sensors, photodiodes), where it would introduce significant error. Additionally, its slew rate (1.5V/µs) is far lower than the original's (17.8V/µs), preventing it from handling mid-to-high frequency or fast-changing signals and resulting in severely inadequate dynamic performance. While its supply current is exceptionally low, this comes at the cost of sacrificing the high input impedance and high-speed performance characteristic of JFET amplifiers. It is only applicable to ordinary low-frequency circuits where these two performance aspects are not required.