The TXC Corporation 8Z40000030 is an ovenized ceramic surface mount crystal oscillator. This oscillator is capable of operating in temperatures between -40C and +90C, and is equipped with a centre frequency of 40 MHz and an equivalent series capacitance (esr) of 8 pF. This type of oscillator is designed to be used in a variety of frequency-controlled electronic devices, such as watches, cell phones, and computers. The 8Z40000030 is a reliable and cost-effective option when stability and accuracy are essential.