Original Part
Alternative Part
1. LMH6658MAX/NOPB Substitution Conclusion
The LMH6658MAX/NOPB is fully compatible with the AD8058ARZ-REEL7 in package and supply voltage range (3 V to 12 V), making it a potential drop‑in replacement in some applications. However, several key performance differences must be considered: its –3 dB bandwidth (270 MHz) and slew rate (700 V/µs) are both lower than those of the original part (325 MHz and 1150 V/µs). This can result in reduced bandwidth and slower transient response in high‑speed signal‑processing circuits. The output is rail‑to‑rail, offering wider dynamic range and an advantage in low‑voltage designs, but the input bias current (5 µA) is substantially higher than that of the original (500 nA). This introduces greater DC error in high‑impedance input stages. Supply current (total ~13 mA) is slightly lower, so power dissipation is comparable, while output current (110 mA per channel) is higher, providing stronger drive capability. In summary, the LMH6658 can serve as a substitute where high‑speed performance is not critical and the elevated input bias current is acceptable, but signal integrity and precision impacts must be evaluated.
2. OPA2889IDR Substitution Conclusion
The OPA2889IDR matches the original part in package and roughly in supply‑voltage range (2.6 V to 12 V, compatible with the original 3 V to 12 V), but its suitability as a direct replacement is limited due to significant parametric differences. Its –3 dB bandwidth (115 MHz) and slew rate (250 V/µs) are considerably lower than those of the original (325 MHz and 1150 V/µs). In high‑speed or high‑frequency applications, this will fail to meet signal‑amplification requirements, potentially causing distortion and response delays. Input bias current (150 nA) is lower, which benefits high‑precision measurement circuits; however, input offset voltage (1.5 mV) is slightly higher (original: 1 mV) and may increase DC error. Supply current (total ~1.84 mA) is extremely low, offering a clear power‑saving advantage in battery‑operated systems, but output current (60 mA per channel) and overall performance focus differ. The OPA2889 is suitable only for applications where speed is not critical and low power consumption is prioritized; it cannot directly replace the AD8058 in high‑speed roles.
Analysis ID: 258B-D557000
Based on part parameters and for reference only. Not to be used for procurement or production.
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