Smd quartz crystals hc 49us ansen quartz as49sd 12m fe200f3 a 1200000mhz smd quartz crystal with a plusmn30ppm tolerance the surface mounting crystal has a height above board of just 38mm and comes in a metal welded hc 49us package suitable applications for this device includes computers tablets laptops commnications devices etc the crystal has excellent frequency aging stability and high shock and heat resistance 12mhz 30ppm h 49us smd crystal