Original Part
Alternative Part
1. AD823ARZ-R7 Substitution Conclusion
Direct substitution is generally not feasible, as these are devices based on different technology paths. The key differences are as follows: The AD823 utilizes a J-FET input stage, which provides an exceptionally low input bias current (5 pA vs. 250 nA). This minimizes error when interfacing with high-impedance sensors (e.g., photodiodes, pH electrodes). However, this comes at the cost of significantly worse input offset voltage (700 µV vs. 200 µV) and higher quiescent current (7mA vs. 3.6mA total). Furthermore, while its slew rate (25V/µs) and bandwidth are higher, its output drive capability (17 mA vs. 30 mA) is somewhat weaker. It is not a drop-in replacement for the LT1498, but rather a specialized solution for applications demanding ultra-high input impedance and low input current. If the original design relies on the LT1498's low offset voltage and moderate power consumption, substitution may degrade precision and increase thermal dissipation.
2. LM7322QMAX/NOPB Substitution Conclusion
This device can serve as a performance-enhanced substitute in most scenarios, but critical parameter boundaries require attention. The differences are: The LM7322 offers a higher gain-bandwidth product (20 MHz vs. 10.5 MHz) and slew rate (18V/µs vs. 6V/µs), delivering superior dynamic performance for faster signals. Its output drive capability (100 mA vs. 30 mA) is an order of magnitude stronger, enabling it to drive heavier loads directly. Conversely, its input bias current (1.1 µA vs. 250 nA) is several times larger, potentially introducing greater error with high-impedance sources, and its input offset voltage (700 µV vs. 200 µV) is also inferior. Additionally, it features Automotive (AEC-Q100) qualification for higher reliability. For applications not critically dependent on ultra-low input bias current and offset voltage, and operating within a 2.5V to 32V supply range, the LM7322 represents a high-quality alternative offering comprehensive upgrades in speed, drive strength, and reliability.
Analysis ID: 93F9-D754000
Based on part parameters and for reference only. Not to be used for procurement or production.
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