Original Part
Alternative Part
1. LMH6655MA/NOPB Substitution Conclusion
The LMH6655MA/NOPB is a pin-for-pin and operational amplifier type-compatible substitute. However, its minimum supply voltage of 4.5V (versus 2.6V for the OPA2889) prevents operation in low-voltage applications, such as single-supply 3.3V systems. Its quiescent current of 9mA (significantly higher than the OPA2889's 1.84mA) increases system power dissipation, making it unsuitable for battery-powered designs. With an input bias current of 5µA (compared to 150nA), it can introduce significant offset errors in high-impedance input circuits, degrading precision.
On the positive side, its 260MHz gain-bandwidth product (GBW) (versus 75MHz) and 120mA output current capability (versus 60mA) support higher bandwidth and stronger load driving, making it suitable for high-speed signal processing or driving heavy loads.
Substitution is viable only when the application supply voltage exceeds 4.5V, power consumption is not critical, and the source impedance is low. Even then, the impact of its higher bias current on system error budget must be re-evaluated.
2. LT1813CS8TRPBF Substitution Conclusion
The LT1813CS8TRPBF offers high compatibility with the OPA2889 in package and supply voltage range (2.5V-12.6V vs. 2.6V-12V), making it suitable for low-voltage applications. Its slew rate of 750V/µs (versus 250V/µs) provides faster transient response for high-speed signal processing. An input offset voltage of 500µV (lower than 1.5mV) improves DC accuracy and reduces calibration requirements.
Drawbacks include a higher supply current of 6mA (versus 1.84mA), which increases power dissipation and may impact efficiency. Its input bias current of 900nA (versus 150nA) introduces larger offset voltage errors in high-impedance circuits and requires careful consideration. The 100MHz GBW offers slightly more bandwidth than the 75MHz of the OPA2889, but the difference is marginal.
This device serves as a direct substitute in applications requiring high speed and precision where moderate power consumption is acceptable, particularly in instrumentation amplification or data acquisition systems. A thorough evaluation of bias current effects on the specific circuit is necessary.
Analysis ID: 0E99-FD62000
Based on part parameters and for reference only. Not to be used for procurement or production.
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