1. LM2904AQTH-13 Substitution Conclusion The LM2904AQTH-13 can generally replace the original LM2904WYPT in most universal applications. However, its degraded AC performance makes it unsuitable for circuits with specific bandwidth and slew rate requirements. The key differences are as follows: First, regarding supply voltage range, the LM2904AQTH-13 (2V to 36V) outperforms the original part (3V to 30V), offering better adaptability to a wider operating voltage range, particularly advantageous in low-voltage applications. Second, and most critically, the LM2904AQTH-13 exhibits a gain-bandwidth product (700 kHz vs. 1.1 MHz) and slew rate (0.3 V/µs vs. 0.6 V/µs) that are approximately 60% of the original specifications. Consequently, its maximum operating frequency for signals of the same amplitude is lower, and its output responds more slowly to large-amplitude, fast-changing signals. This can lead to reduced high-frequency gain or waveform distortion. Substitution is acceptable if the application circuit is not sensitive to signal bandwidth or transient response speed. However, for use in audio, signal conditioning, or feedback loops requiring a certain level of speed, a thorough re-evaluation is necessary.