小尺寸的ECS無源晶體支持時序解決方案ECS-200-20-5PXDN-TR，更高的等效串聯電阻 (ESR) 是工程師在使用更小的無源晶振晶體時會看到的其他東西。ESR是內部電阻，代表電子電路中的能量損失。幾乎每個電路都會有不同程度的某種 ESR。

ESR的水平取決于許多因素，例如特定的結構、材料、質量等。ESR可以在從幾毫歐到幾歐（或 1,000 毫歐）的任何地方測量。如果ESR太高，您可能會看到不同的結果，例如晶振功率損耗、效率低下和電路不穩定。

Manufacturer Part Number原廠編碼	Manufacturer廠家	Series型號	Type 系列	Frequency	Operating Temperature 工作溫度
ECS-.327-6-12-TR	ECS晶振	ECX-12	kHz Crystal (Tuning Fork)	32.768kHz	-40°C ~ 85°C
ECS-200-20-5PXDN-TR	ECS晶振	CSM-7X-DN	MHz Crystal	20MHz	-40°C ~ 85°C
ECS-200-20-5PXDN-TR	ECS晶振	CSM-7X-DN	MHz Crystal	20MHz	-40°C ~ 85°C
ECS-200-20-5PXDN-TR	ECS晶振	CSM-7X-DN	MHz Crystal	20MHz	-40°C ~ 85°C
ECS-135.6-20-3X-EN-TR	ECS晶振	CSM-3X	MHz Crystal	13.56MHz	-40°C ~ 85°C
ECS-135.6-20-3X-EN-TR	ECS晶振	CSM-3X	MHz Crystal	13.56MHz	-40°C ~ 85°C
ECS-135.6-20-3X-EN-TR	ECS晶振	CSM-3X	MHz Crystal	13.56MHz	-40°C ~ 85°C
ECS-200-CDX-0914	ECS晶振	CSM-3X	MHz Crystal	20MHz	-60°C ~ 105°C
ECS-200-CDX-0914	ECS晶振	CSM-3X	MHz Crystal	20MHz	-60°C ~ 105°C
ECS-200-CDX-0914	ECS晶振	CSM-3X	MHz Crystal	20MHz	-60°C ~ 105°C
ECS-40.3-20-5PX-TR	ECS晶振	CSM-7X	MHz Crystal	4.032MHz	-10°C ~ 70°C
ECS-40.3-20-5PX-TR	ECS晶振	CSM-7X	MHz Crystal	4.032MHz	-10°C ~ 70°C
ECS-40.3-20-5PX-TR	ECS晶振	CSM-7X	MHz Crystal	4.032MHz	-10°C ~ 70°C

小尺寸的ECS無源晶體支持時序解決方案ECS-200-20-5PXDN-TR，一般來說，較小的晶體會導致較高的ESR，但還有其他幾個因素，包括頻率、電極尺寸和安裝結構。考慮到所有這些因素以及ESR的潛在影響，很容易理解為什么在考慮在振蕩器中使用較小的石英晶振時不能忽視它。沒有它就無法保證穩定的振蕩器。

Higher equivalent series resistance (ESR) is something else engineers will see with smaller crystals. ESR is the internal resistance and represents the loss of energy in an electronic circuit. Almost every electrical circuit will have some kind of ESR to differing degrees.

The level of ESR depends on many factors such as the specific construction, materials, quality, etc. ESR can be measured anywhere from a few milliohms to several ohms (or 1,000 milliohms). If the ESR is too high, you may see varying results like power losses, poor efficiency and instability in circuits.

As a general rule, smaller crystals result in higher ESR, but there are several other factors including frequency, electrode size and mounting structure. With all of these factors involved and the potential effects of ESR, it’s easy to see why it can’t be overlooked when considering using smaller quartz crystals in oscillators. A stable oscillator can’t be guaranteed without it.

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