Characteristics and Application Introduction of Epson Passive Crystal MC-146

Apr 19,2024
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Epson's MC-146 series products have a wide range of applications, such as small newsletters, industrial control, etc., covering almost all fields. It belongs to a series with very good cost-effectiveness at the current stage.

There are many types of crystal oscillators, among which passive crystals are the simplest. In each design, a large number of crystal oscillators are used, both active and passive. Which part uses which type of crystal, and which parameters of these crystals are the first to be considered. Of course, this is a comprehensive consideration. Today, let's first talk about Epson's commonly used series MC-146.

Features:

Frequency range: mc-146 32.768 kHz: mc-146 type 32kHz~100kHz

External size scale: 7.0 x 1.5 x 1.4mm

Harmonic frequency: fundamental frequency

Main applications: various clock signals

Passive crystal parameters mainly consider four factors: packaging, frequency accuracy, load capacitance, and operating temperature. Other considerations may vary depending on project requirements.

Frequency Tolerance: This parameter, also known as frequency precision, is measured in ppm (parts per million) and has three categories: ± 20x10-6,=50x10-6,+100x10-6

Package: 7.0x1.5x1.4mm, this package is slightly larger and belongs to the slender type. Products that are not suitable for miniaturization.

Load capacitance: 7pE, 9pF, 12.5pF. Passive K-level crystals mainly have these three pf values. If there are other requirements, they can be negotiated with the manufacturer. Of course, Epson also has 6pt crystals. The smaller the Pf value, the easier it is for the circuit to oscillate and the lower the power consumption of the circuit. However, the external capacitance value has a significant impact on frequency (low frequency stability). The larger the Pf value, the more difficult it is for the circuit to oscillate and the higher the power consumption of the circuit. However, the change in external capacitance has a low impact on the output frequency (good frequency stability).

Working temperature: -40 ° C~+85 ° C. Please note that if there are designs beyond this range, this product is not suitable.

Secondary parameter: Series resistance (ESR), also known as equivalent resistance. The smaller the value, the better, as it is limited by the current process technology and water quality. The smaller it is, the easier it is to vibrate and the lower the power consumption. Due to process technology, under the same frequency, the smaller the package, the greater the ESR value, which is a physical phenomenon.