# What's the difference between 24AA1025, 24FC1025 and 24LC1025

24AA1025: operates from 1.7V - 5.5V, 400kHz, $2.37 24FC1025: operates from 2.5V - 5.5V, 1 MHz,$2.37

24LC1025: operates from 2.5V - 5.5V, 400kHz, \$2.37

24AA1025 is unique, because of the lower operating range. What I don't understand is why Microchip produce both 24FC1025 and 24LC1025 at the same price with different maximum clock frequencies. Why not just make one? Am I missing something?

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It seems clear to me. The FC component has a higher clock frequency, but it also has a lower maximum operating temperature. The LC extends this maximum operating temperature, but at the cost of some of the clock frequency.

That gives you the choice of either high temperature, or high clock frequency.

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