晶振在蓝牙模块中无处不在，常用的三款晶振是SMD2016，SMD2520，SMD3225贴片晶振，常用的频率：16MHZ，24MHZ，26MHZ。另外还有一款频率为32.768KHZ。晶振是非常复杂的频率元器件。
日本爱普生晶振FA-238是一款小体积晶振尺寸3.2x2.5mm石英晶体谐振器，无源晶振，四脚贴片晶振，频率范围12MHz至60MHz，可在在-40℃至+85℃（+105℃）温度内稳定工作，具有超小型，轻薄型，耐热及耐环境特性，适用于蓝牙模块，移动电话，无线-局域网，汽车电子，智能手机，ISM频段电台广播，MPU时钟等。
FA-238无源晶振Q22FA2380023800适用于蓝牙模块晶振,Q22FA2380024000,3225mm晶振

产品编码	尺寸	型号	石英晶振	负载	精度	频率公差	工作温度
Q22FA2380009800	3.2x2.5x0.7mm	FA-238	30.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380010300	3.2x2.5x0.7mm	FA-238	27.000000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380011400	3.2x2.5x0.7mm	FA-238	24.000000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380012000	3.2x2.5x0.7mm	FA-238	24.576000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380012700	3.2x2.5x0.7mm	FA-238	18.432000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380012800	3.2x2.5x0.7mm	FA-238	18.432000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380012900	3.2x2.5x0.7mm	FA-238	22.579200MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380013300	3.2x2.5x0.7mm	FA-238	16.000000MHz	12pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380013700	3.2x2.5x0.7mm	FA-238	40.000000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380013800	3.2x2.5x0.7mm	FA-238	27.000000MHz	8pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380014000	3.2x2.5x0.7mm	FA-238	48.000000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380014100	3.2x2.5x0.7mm	FA-238	32.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380014600	3.2x2.5x0.7mm	FA-238	26.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380014700	3.2x2.5x0.7mm	FA-238	26.000000MHz	20pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380014800	3.2x2.5x0.7mm	FA-238	48.000000MHz	12pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380014900	3.2x2.5x0.7mm	FA-238	18.432000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380015600	3.2x2.5x0.7mm	FA-238	24.576000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380016500	3.2x2.5x0.7mm	FA-238	25.000000MHz	12pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380017000	3.2x2.5x0.7mm	FA-238	20.000000MHz	20pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380017900	3.2x2.5x0.7mm	FA-238	16.000000MHz	12.5pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380019000	3.2x2.5x0.7mm	FA-238	24.576000MHz	8pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380019800	3.2x2.5x0.7mm	FA-238	24.576000MHz	7pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380020500	3.2x2.5x0.7mm	FA-238	19.200000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380021600	3.2x2.5x0.7mm	FA-238	16.000000MHz	12pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380023800	3.2x2.5x0.7mm	FA-238	24.000000MHz	20pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380024000	3.2x2.5x0.7mm	FA-238	24.000000MHz	30pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380024400	3.2x2.5x0.7mm	FA-238	48.000000MHz	20pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380024500	3.2x2.5x0.7mm	FA-238	24.000000MHz	30pF	+/-30ppm	+/-30ppm	-20to+70°C

Q22FA2380025100	3.2x2.5x0.7mm	FA-238	36.864000MHz	8pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380026300	3.2x2.5x0.7mm	FA-238	16.000000MHz	9pF	+/-15ppm	+/-30ppm	-20to+70°C
Q22FA2380026400	3.2x2.5x0.7mm	FA-238	20.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380026900	3.2x2.5x0.7mm	FA-238	27.000000MHz	9pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380029100	3.2x2.5x0.7mm	FA-238	27.000000MHz	7pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380030500	3.2x2.5x0.7mm	FA-238	24.576000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380031200	3.2x2.5x0.7mm	FA-238	28.636360MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380032200	3.2x2.5x0.7mm	FA-238	20.000000MHz	12.5pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380032900	3.2x2.5x0.7mm	FA-238	32.000000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380033800	3.2x2.5x0.7mm	FA-238	24.000000MHz	18pF	+/-15ppm	+/-30ppm	-20to+70°C
Q22FA2380035000	3.2x2.5x0.7mm	FA-238	20.000000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380035300	3.2x2.5x0.7mm	FA-238	33.330000MHz	12pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380035500	3.2x2.5x0.7mm	FA-238	27.000000MHz	7pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380035600	3.2x2.5x0.7mm	FA-238	45.000000MHz	12pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380036400	3.2x2.5x0.7mm	FA-238	48.000000MHz	7pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380036700	3.2x2.5x0.7mm	FA-238	16.000000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380040500	3.2x2.5x0.7mm	FA-238	40.000000MHz	10pF	+/-50ppm	+/-50ppm	-20to+70°C
Q22FA2380041500	3.2x2.5x0.7mm	FA-238	27.120000MHz	12pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380041900	3.2x2.5x0.7mm	FA-238	40.000000MHz	7pF	+/-50ppm	+/-50ppm	-20to+70°C
Q22FA2380042100	3.2x2.5x0.7mm	FA-238	16.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380042300	3.2x2.5x0.7mm	FA-238	30.000000MHz	18pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380043200	3.2x2.5x0.7mm	FA-238	50.000000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380044700	3.2x2.5x0.7mm	FA-238	48.000000MHz	10pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380044800	3.2x2.5x0.7mm	FA-238	50.000000MHz	7pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380045800	3.2x2.5x0.7mm	FA-238	16.384000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380046400	3.2x2.5x0.7mm	FA-238	33.333000MHz	10pF	+/-50ppm	+/-30ppm	-20to+70°C
Q22FA2380047800	3.2x2.5x0.7mm	FA-238	25.000000MHz	18pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380048000	3.2x2.5x0.7mm	FA-238	27.000000MHz	10pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380048300	3.2x2.5x0.7mm	FA-238	16.000000MHz	10pF	+/-20ppm	+/-30ppm	-40to+85°C
Q22FA2380048900	3.2x2.5x0.7mm	FA-238	27.000000MHz	10pF	+/-20ppm	+/-30ppm	-40to+85°C
Q22FA2380054700	3.2x2.5x0.7mm	FA-238	25.000000MHz	16pF	+/-30ppm	+/-30ppm	-20to+70°C
Q22FA2380055300	3.2x2.5x0.7mm	FA-238	30.000000MHz	16pF	+/-50ppm	+/-30ppm	-20to+70°C

FA-238无源晶振Q22FA2380023800适用于蓝牙模块晶振,Q22FA2380024000,3225mm晶振
蓝牙模块中最佳贴片晶振组合常用到一款MHZ晶振和32.768KHZ晶振，MHZ晶振中有三种频率最为广泛应用，12MHZ，16MHZ，24MHZ ，26MHZ，32MHZ。通常使用到的封装为SMD2.0x1.6mm贴片晶振，SMD2.5x2.0mm贴片晶振，SMD3.2x2.5mm贴片晶振。

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