Original Part
Alternative Part
1. LM224KADR Substitution Conclusion
The LM224KADR (TI) can generally substitute for the LM224WDT (ST), though differences in output drive capability should be noted. Key variations include: the LM224KADR offers a slightly higher slew rate (0.5 V/µs) compared to the original part (0.4 V/µs), while its bandwidth (1.2 MHz) is similar to the original (1.3 MHz). Its input bias current (15 nA) is lower than that of the original (20 nA), which helps reduce error in high-impedance signal chains. However, its output current (30 mA) is lower than the original’s 40 mA, which may limit its ability to drive high capacitive loads or heavy current loads. The supply range (3 V to 30 V) and package (14‑SOIC) are fully compatible. This substitution is suitable for general-purpose amplifier circuits where high drive capability is not critical but input precision is valued.
2. LM224DR2G Substitution Conclusion
The LM224DR2G (onsemi) can conditionally replace the LM224WDT (ST), though significant differences exist in key dynamic performance parameters. Notable deviations include: its bandwidth (1 MHz) is lower than the original (1.3 MHz), and its slew rate is not specified (often implying a lower value). The input bias current (90 nA) is considerably higher than the original (20 nA), which may increase DC error and makes it unsuitable for high-precision sensing amplifiers. Advantages include an output current (40 mA) matching the original, along with a slightly wider upper supply limit (32 V). The package is compatible. This substitution is appropriate for low-cost applications where bandwidth and precision are relaxed, but output drive capability or a marginally wider supply range must be maintained.
Analysis ID: ADD4-024F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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