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In our work, we may have heard of HC-49S and HC-49US models. In fact, HC-49S and HC-49US are the same. It can also be called 49S in short, and the complete wording is HC-49/ US. So what is the difference between 49S and 49U quartz crystal resonators.
Figure 1 Common 49S crystal oscillators in the consumer industry
Figure 2 Because the shape resembles the letter U, it is obvious that 49U is it
In the two figures, it is not difficult to see that the space occupied by the 49S crystal oscillator in the circuit board is only 1/4 of the 49U crystal oscillator. HC-49S has another similar model HC-49SA. HC-49S and HC-49SA have the same shape and size, but the vibration mode is different. HC-49S is the AT base frequency, and HC-49SA is the BT base frequency. The shape of HC-49SA, HC-49US and HC-49U The size is different. The shape and size of HC-49U is larger than that of HC-49S. It is U-shaped. The height of HC-49S is about one-fourth of HC-49U. Their parameters are similar. In some cases, they are interchangeable. Choose the one according to the size of the free space of the product, the space occupied by HC-49S is smaller than that of HC-49U, and the cost is also lower
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