Original Part
Alternative Part
1. AD817ARZ-REEL7 Substitution Conclusion
From a review of key specifications, the AD817ARZ-REEL7 outperforms or fully covers the original part in slew rate (350 V/µs vs. 250 V/µs), gain-bandwidth product (50 MHz vs. 45 MHz), output current (50 mA vs. 26 mA), and supply voltage range (5–36 V vs. 10–30 V). Its quiescent current (7 mA vs. 8 mA) is also marginally lower. However, its input bias current (3.3 µA) is two orders of magnitude higher than that of the LT1220 (100 nA), which may introduce significant input error in high-impedance signal paths or precision DC applications. This makes it unsuitable for input-current-sensitive circuits such as photodetection or high-precision integrators. If the system prioritizes high speed, output drive, and wide supply compatibility, and the input bias current is acceptable, the AD817 can serve as a substitute.
2. AD847JRZ-REEL7 Substitution Conclusion
The AD847JRZ-REEL7 offers slightly better slew rate (300 V/µs) and gain-bandwidth product (50 MHz) compared to the original part, along with significantly lower quiescent current (5.3 mA), moderately higher output current (32 mA), and a supply voltage range (9–36 V) that covers the original device. However, it similarly suffers from an input bias current (3.3 µA) much higher than that of the LT1220. Additionally, its minimum supply voltage (9 V) is slightly lower than the original part’s 10 V, requiring verification of low-voltage operational stability. Its low quiescent current makes it suitable for power-sensitive designs, but the high input bias current limits direct substitution in precision low-frequency applications. It is better suited for systems where low power consumption and speed are critical, and where the source impedance is relatively low.
Analysis ID: 0670-2A2D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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