Crystal Filter
Monolithic crystal filters in UM-1, UM-4, UM-5 and HC-49T packages are compact, light and frequency-stable for communications, aerospace, pilot selection and IF filtering, including radios, cordless phones, pagers and radio stations. Families include MCF10.7MHz, MCF21.4MHz, customizable special23–60MHz fundamental-mode and MCF45MHz third-overtone products. Crystal reliability tests: free fall six times from75cm onto a2cm-thick rubber board, with post-drop frequency deviation≤4ppm. Vibration:10–55Hz,0.75mm amplitude,30minutes per XYZ axis; frequency change≤±20ppm. Lead strength: hold body and apply0.9kg axial pull for30±5s without lead pullout/breakage. Sealing: immerse in alcohol at stated pressure5kg/cm for5minutes, then lead-to-base insulation>500MΩ at DC100V. Temperature cycling retains the stated sequence “2–3min, -20℃…+70℃,30min,30min”; after three cycles, no damage and vibration-equivalent performance. Solderability: immerse leads at2–3.0mm from the stated end/base position in230±5℃ solder for2±0.5s, coverage>95%, with vibration-equivalent performance. Solder-heat resistance:2–2.5mm position,350±10℃ for3.5±0.5s, no abnormal appearance and vibration-equivalent performance. Low temperature:-25±3℃ for2hours, then2hours recovery at room temperature. The high-temperature-resistance test is stated as-70±2℃ for2hours, then2hours recovery. Both use vibration-equivalent performance. Damp heat:40±3℃,RH93%±2%,48hours, then2hours recovery, no abnormal appearance and vibration-equivalent performance. Aging:80±2℃ for72hours,2hours room-temperature recovery, frequency change≤±5ppm and resistance change≤±15Ω. Additional references include MCF tape-and-reel outline/drawings and MCF30–60MHz. Stated outline dimensions are length13.4×width8.5×height10.0, without a supplied unit.
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