The HDFB01RSB-B5 is a surface mount SAW filter smd made by Shoulder Electronics. It has a dimension of 1.1x0.9mm and is RoHS compliant. It is a high-performance SAW filter smd which can be used in a variety of applications such as cellular phones, radios, GPS receivers, automotive, land navigation, medical equipment, and military and space applications. The filter has a Center Frequency of 400 MHz, Insertion Loss of 2.7dB, Filter Bandwidth of 5 MHz, and Image Rejection of -38dB. It also has a low noise figure and low temperature coefficient.