connThe Abelconn HC-49SMD RoHS 12MHz +20ppm SMD Crystal Resonator is a surface mounted electronic component used to generate an accurate reference frequency for high-speed data transmission. It features a 12MHz oscillation frequency, ±20ppm accuracy, and a 30ppm tolerance. The package size is HC-49SM which meets JEDEC and HS standards. It comes with an insulated metal lid suitable for soldering using standard reflow processes. The high accuracy and low temperature drift make this part suitable for various frequency-based applications, such as wireless communication and mobile networks.