Original Part
Alternative Part
1. OPA338NA/250 Substitution Conclusion
As a substitute for the LMP7717MFX/NOPB, the OPA338NA/250 is only suitable for low-power applications with modest requirements for speed, precision, and drive capability, given its package compatibility (both are SOT-23-5) and identical maximum supply voltage (5.5V). Key differences include: a significant reduction in slew rate from 35 V/µs to 4.6 V/µs, which markedly degrades the amplifier's ability to handle fast signal transitions and may lead to distortion in high-frequency or transient responses; a drop in gain-bandwidth product from 88 MHz to 12.5 MHz, limiting the amplifier's high-frequency bandwidth and signal processing speed; an increase in input offset voltage from 10 µV to 500 µV, introducing greater DC error and reducing system accuracy; a decrease in output current from 60 mA to 9 mA, reducing load drive capability and making it unsuitable for heavy loads; and a higher minimum supply voltage of 2.7 V versus 1.8 V, preventing its use in applications requiring operation from 1.8 V to 2.7 V. Its quiescent current is lower at 525 µA compared to 1.15 mA, resulting in lower power consumption, which is beneficial for battery-powered devices. Substitution may be considered if the application involves only low-frequency, low-precision signal processing and operates above 2.7 V. However, it is not viable for high-speed, high-precision, or high-drive requirements.
2. OPA337NA/250 Substitution Conclusion
The OPA337NA/250 is a poor substitute for the LMP7717MFX/NOPB and is only appropriate for very low-speed, non-precision, low-power, simple applications. Its performance deviations are similar to but more pronounced than those of the OPA338: the slew rate drops from 35 V/µs to 1.2 V/µs, further impairing fast signal response and potentially causing severe signal distortion; the gain-bandwidth product is drastically reduced from 88 MHz to 3 MHz, resulting in extremely limited bandwidth suitable only for low-frequency applications such as audio or DC signals; the input offset voltage is 500 µV (same as the OPA338), significantly higher than the original part's 10 µV, introducing noticeable DC offset error and impacting measurement accuracy; the output current is 9 mA, indicating weak drive capability; and the minimum supply voltage is 2.7 V, precluding operation at 1.8 V. Its sole advantage is a lower quiescent current of 525 µA, offering better power efficiency. Substitution is not recommended unless the application has extremely low demands for speed, precision, and drive, and operates above 2.7 V.
Analysis ID: 56B9-9850000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com