Original Part
Alternative Part
1. LM258AST Substitution Conclusion
The LM258AST can serve as a direct substitute for the LM258DMR2G, provided that supply voltage limits and package compatibility are considered. Key performance differences include: a slightly higher gain-bandwidth product (1.1 MHz vs. 1 MHz), lower input bias current and offset voltage (20 nA/1 mV vs. 45 nA/2 mV), and improved accuracy and temperature drift characteristics. The supply current is also lower (700 µA vs. 800 µA), contributing to reduced power consumption. However, its maximum supply voltage is slightly lower (30 V vs. 32 V); if the original circuit operates close to 32 V, a reassessment is necessary. Additionally, the AST variant is AEC-Q100 qualified, making it suitable for automotive electronic environments. The package is identical—8-MSOP with 3.00 mm width—and the pinout is fully compatible, allowing a drop-in replacement.
2. LM258APT Substitution Conclusion
The LM258APT is electrically compatible with the LM258DMR2G, but the package difference requires careful evaluation. Its electrical parameters are identical to those of the AST version (1.1 MHz gain-bandwidth, low input error, low power consumption, 30 V maximum supply) and outperform the original part. The primary distinction lies in the package: the APT uses an 8-TSSOP with 4.40 mm width, whereas the original device is housed in an 8-MSOP with 3.00 mm width. This means the PCB layout must be adapted; pad dimensions and component height may differ. If board space and layout permit, and the circuit voltage does not exceed 30 V, the APT can offer improved accuracy and automotive-grade reliability. However, it is not pin‑to‑pin or footprint compatible.
Analysis ID: BDBA-EE95000
Based on part parameters and for reference only. Not to be used for procurement or production.
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