1. NJM2902M Substitution Assessment The NJM2902M can serve as a functional replacement for the LM2902KD in basic applications, with several key considerations. Its gain bandwidth product (500 kHz) is notably lower than that of the original part (1.2 MHz), which may result in insufficient bandwidth for higher‑frequency operation or applications requiring higher closed‑loop gain, potentially degrading signal‑processing performance. Additionally, its package width (5.00 mm) exceeds the original’s footprint (3.90 mm); this could prevent direct mechanical compatibility on space‑constrained PCB layouts. Advantages include a wider supply‑voltage range (up to 32 V), higher output current capability (40 mA), and slightly better input offset voltage (2 mV). These characteristics make the NJM2902M suitable for applications where bandwidth is not critical but wider supply range or stronger output drive is needed. Substitution is feasible if the operating frequency remains low (e.g., DC or low‑audio range) and the larger package can be accommodated. 2. LM2902DR2G Substitution Assessment The LM2902DR2G offers high electrical and mechanical compatibility with the LM2902KD, featuring an identical 3.90‑mm‑wide 14‑SOIC package. It also provides improved supply‑voltage range (32 V) and output current (40 mA) relative to the original part. However, its input bias current (90 nA) is substantially higher than the original’s 20 nA, which may introduce greater input error in circuits demanding high input impedance or precision DC amplification. Furthermore, its gain‑bandwidth product (1 MHz) is slightly lower than the original’s 1.2 MHz, imposing a minor impact on high‑frequency performance. This device can be used as a direct substitute in applications where input bias current is not critical—such as general‑purpose signal conditioning or comparator circuits—and where the slight bandwidth reduction is acceptable. For high‑precision DC amplification, careful evaluation is recommended before substitution.