ECS ECS-96SMF SMD Crystal Filters are 21.4MHZ and 45.0MHz miniature SMD monolithic crystals. ECS ECS-96SMF SMD Crystal Filters offer a narrow bandwidth and a 2-pole response in a 5mm x 7mm package. The series offers a 3dB passband minimum and 10dB to 20dB stopband maximum within a -30°C to +80°C temperature range.