This part is a miniature AT or BT cut strip crystal units with a low profile package,It is with resistance weld.49SB series is with lower height of less than 2.5mm. 频率范围:49SA:3.200～66.000MHz;49SB8.000～66.000MHz 调整频差:在25度±10～±50ppm 工作温度范围:负20度到正70度