1、 INCH-POUND AMSC N/A FSC 5955 MIL-PRF-3098/51J 13 April 2010 SUPERSEDING MIL-PRF-3098/51H 9 December 2004 PERFORMANCE SPECIFICATION SHEET CRYSTAL UNIT, QUARTZ, CR74/U This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring t
2、he product described herein shall consist of this specification sheet and MIL-PRF-3098. Pertinent characteristics: 45 MHz to 125 MHz; fifth mechanical overtone; controlled; series resonance. FIGURE 1. Crystal unit - CR74/U. Copyright Communications - Electronics Command Provided by IHS under license
3、 with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-3098/51J 2 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Marking to be in accordance with MIL-PRF-3098. FIGURE 1. Crystal unit - CR74/U - Contin
4、ued. Ltr Inches mm Min Max Min Max A - .183 - 4.65 B - .435 - 11.05 C - .402 - 10.21 D - .530 - 13.46 E .500 - 12.70 - F .016 .019 0.41 0.48 G - .150 - 3.81 H .184 .200 4.67 5.08 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or ne
5、tworking permitted without license from IHS-,-,-MIL-PRF-3098/51J 3 REQUIREMENTS: Dimensions, marking, and configuration: See figure 1. Frequency range: 45 MHz to 125 MHz, inclusive. Capacitance, shunt: 4.5 pF 0.5 pF. Frequency tolerance: Operating temperature range: 10 ppm. Frequency stability: 2.5
6、ppm. Equivalent resistance: 20 ohms, minimum; 50 ohms, maximum. Mode of oscillation: Fifth mechanical overtone. Temperature ranges: Operating (controlled): +80C to +90C, inclusive. Operable: -55C to +80C, inclusive. Reference temperature: +85C 1C. Rated drive level: 1.0 mW, maximum. Resonance: Serie
7、s. Unwanted mode: Twice main mode. Shock (specified pulse): Frequency change permitted: 3 ppm. Equivalent resistance change permitted: 15 percent. Vibration high frequency: Method 204 of MIL-STD-202, test condition A. Frequency change permitted: 3 ppm. Equivalent resistance change permitted: 15 perc
8、ent. Thermal shock: Frequency change permitted: 3 ppm. Equivalent resistance change permitted: 15 percent. Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-3098/51J 4 Aging
9、: Frequency change permitted: 3 ppm. Part or Identifying Number (PIN): CR74/U (followed by specified frequency), see 1.2 of MIL-PRF-3098. Reference documents. In addition to MIL-PRF-3098, this document references the following: MIL-STD-202 The margins of this specification are marked with vertical l
10、ines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire co
11、ntent irrespective of the marginal notations and relationship to the last previous issue. Custodians: Preparing activity: Army - CR Army - CR Navy - EC Air Force - 99 Agent: DLA - CC DLA - CC Review activities: (Project 5955-2009-060) Army - AR, MI, SM Navy - AS, CG, MC, OS, SH Air Force - 19, 84, 9
12、9 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.daps.dla.mil. Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
