Original Part
Alternative Part
1. AD847ARZ-REEL Substitution Conclusion
The AD847ARZ-REEL can be used as a substitute, but attention must be paid to differences in input-stage characteristics and supply voltage range. The AD847 offers a slew rate (300 V/µs) and gain-bandwidth product (50 MHz) significantly higher than those of the OPA604 (25 V/µs, 20 MHz), making it suitable for higher-speed signal processing. However, its input bias current (3.3 µA) is three orders of magnitude greater than that of the OPA604 (5 pA), which may introduce noticeable errors in applications sensitive to input current, such as high-impedance sensor interfaces or integrator circuits. Additionally, its maximum supply voltage (36 V) is lower than that of the OPA604 (48 V); system voltage compatibility must therefore be verified. If the application does not rely on extremely low input current and the voltage range is compatible, the AD847 can provide superior high-speed performance.
2. OP42GSZ-R7 Substitution Conclusion
Substitution with the OP42GSZ-R7 should be approached with caution, as it is only suitable for certain medium-speed applications. The OP42 employs a JFET input stage, offering an input bias current (130 pA) much lower than that of the AD847, though still higher than the 5 pA of the OPA604—this may affect high-precision DC applications. Its slew rate (50 V/µs) is better than that of the OPA604, while its gain-bandwidth product (10 MHz) is lower, making it more suitable for medium-speed signal processing rather than high-frequency requirements. Furthermore, its minimum supply voltage (16 V) is higher than that of the OPA604 (9 V); designs originally using single-supply low voltages (e.g., below 12 V) may fail to start up. In circuits where the supply voltage is compatible and input current requirements are not extremely stringent, the OP42 can serve as a functional replacement, but system bandwidth and precision must be evaluated to ensure they meet the application requirements.
Analysis ID: F62C-893A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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