Original Part
Alternative Part
1. LMH6655MAX/NOPB Substitution Conclusion
The substitution of OPA2889IDR with LMH6655MAX/NOPB requires careful evaluation. Key differences include a higher minimum supply voltage (4.5V vs. the original 2.6V), which may prevent direct compatibility in low-voltage applications such as single-supply 3.3V or lower systems. The significantly higher input bias current (5 µA vs. 150 nA) can introduce greater error in high-impedance signal sources or precision measurement circuits, degrading system accuracy. While the higher gain-bandwidth product (260 MHz vs. 75 MHz) and stronger output current (120 mA vs. 60 mA) make it more suitable for high-frequency signal amplification or heavy-load driving, the slightly lower slew rate (200V/µs vs. 250V/µs) may limit very high-speed transient response. Additionally, the higher quiescent current (4.5mA per channel vs. 920µA per channel) significantly increases power consumption, which could impact battery-operated device runtime. Overall, if the application can accommodate a higher supply voltage and does not rely on low input bias current, the LMH6655 offers superior bandwidth and drive capability. Otherwise, direct substitution is not recommended.
2. LMH6658MAX/NOPB Substitution Conclusion
The substitution of OPA2889IDR with LMH6658MAX/NOPB is feasible but requires trade-offs based on application requirements. Differences include rail-to-rail output (not specified in the original part), which provides wider dynamic output range in low-voltage systems and improves signal integrity. The minimum supply voltage is 3V (vs. the original 2.6V); while slightly higher, it still covers common low-voltage applications (e.g., 3.3V supply), provided the actual voltage does not drop below 3V. The extremely high slew rate (700V/µs vs. 250V/µs) and wider -3dB bandwidth (270 MHz vs. 115 MHz) make it better suited for high-speed signal processing such as video or data acquisition. However, the higher input bias current (5 µA vs. 150 nA) may degrade performance in high-precision or high-impedance front-end circuits and is unsuitable for microvolt-level signal amplification. The stronger output current (110 mA vs. 60 mA) enables driving heavier loads, but the higher quiescent current (6.5mA per channel vs. 920µA per channel) increases power dissipation. In summary, if the application prioritizes high speed, rail-to-rail output, and can tolerate higher power consumption and input bias current, the LMH6658 is a viable alternative. Otherwise, circuit redesign may be necessary to accommodate these differences.
Analysis ID: E822-A71E000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com