There are 20 pins on digital buffer. As low as -40°C can be tolerated by it. You shouldn't let the amibient temperature get higher than 125°C when using this buffer. It is recommended that the voltage used to run this electrical component is at least 4.5V. It is rated for a maximum supply voltage of 5.5V.
74HCT245BQ Features
74HCT245BQ Applications
There are a lot of Rochester Electronics 74HCT245BQ Buffers & Transceivers applications.