I am comparing the long-term drift between the 3525 and 3625.
The test conditions for long-term drift are different, as shown in Table 2 of both datasheets. Both parts show similar performance in terms of noise (uVpp) and output voltage drift (ppm/°C).
The quiescent current is also very similar. The main difference is in line regulation. The initial accuracy also differs: 0.1% for the 3525 and 0.04% for the 3625.
Can you explain, from a physics point of view, why the 3525 exhibits a long-term drift of 30 ppm after 1000 hours, while the 3625 shows a long-term drift of 140 ppm after 1000 hours?
I do not understand the price difference based on these specifications.
From my perspective, the 3625 does not perform better. The 3525 was released in 2010 and is qualified for automotive applications, while the 3625 was released in 2023 and is not qualified for automotive use.
Additionally, the 3625 accepts a maximum load capacitor of 1 uF.
I am not criticizing the 3625; I just do not understand the discrepancy in long-term drift, since it is influenced by test equipment, environment, and package.
I am assuming that your parts are tested under the same conditions.
