DLA MIL-C-18312 G-2013 CAPACITORS FIXED METALLIZED (PAPER-PLASTIC OR PLASTIC FILM) DIELECTRIC DIRECT CURRENT (HERMETICALLY SEALED IN METAL CASES) GENERAL SPECIFICATION FOR [Use DLA.pdf

1、AMSC N/A FSC 5910 INCH-POUND MIL-C-18312G 28 February 2013 SUPERSEDING MIL-C-18312F 27 August 2001 MILITARY SPECIFICATION SHEET CAPACITORS, FIXED, METALLIZED (PAPER-PLASTIC, OR PLASTIC FILM) DIELECTRIC, DIRECT CURRENT (HERMETICALLY SEALED IN METAL CASES), GENERAL SPECIFICATION FOR This specification

2、 is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the general requirements for fixed capacitors with metallized (paper, paper-plastic or plastic film) dielectric, direct current, hermetically sealed in metal cases. These

3、capacitors should only be used in circuitry in which high values of insulation resistance are not essential, and in which occasional momentary breakdowns can be tolerated. 1.2 Classification. 1.2.1 Part or Identifying Number (PIN). The PIN will be in the following form, and as specified (see 3.1): C

4、H09 A 1 N F 225 M Style Terminal Circuit Characteristic Voltage Capacitance Capacitance (1.2.1.1) (1.2.1.2) (1.2.1.3) (1.2.1.4) rating (1.2.1.6) tolerance (1.2.1.5) (1.2.1.7) 1.2.1.1 Style. The style is identified by the two-letter symbol “CH” followed by a two-digit number; the letters identify met

5、allized (paper or plastic film) dielectric, fixed capacitors, and the number identifies the shape of the capacitor. 1.2.1.2 Terminal. The terminal is identified by a single letter as shown in table I. TABLE I. Terminal. Symbol Description A Axial wire-lead B solder lug (non-removable) Comments, sugg

6、estions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to capacitorfilterdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST O

7、nline database at https:/assist.dla.mil. INACTIVE FOR NEW DESIGN after 8 January 1970, use MIL-PRF-39022 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18312G 2 1.2.1.3 Circuit. The circuit diagram (and the number of terminals associated with

8、each diagram) is identified by a single number as shown: 1.2.1.4 Characteristic. The characteristic is identified by a single letter as shown in table II. TABLE II. Characteristic. Symbol Operating temperature range R -55 to +85C N -55 to +125C 1.2.1.5 Voltage rating. The dc voltage rating is identi

9、fied by a single letter as shown in table III. For recommended ac ratings, see 6.9. TABLE III. DC voltage rating. Symbol DC voltage rating (volts) A 50 V 150 C 200 E 400 F 600 1.2.1.6 Capacitance. The nominal capacitance value expressed in picofarads (pF) is identified by a three-digit number; the f

10、irst two digits represent significant figures and the last digit specifies the number of zeros to follow. 1.2.1.7 Capacitance tolerance. The capacitance tolerance is identified by a single letter as shown in table IV. TABLE IV. Capacitance tolerance. Symbol Tolerance J 5 K 10 M 20 2. APPLICABLE DOCU

11、MENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure

12、the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL

13、-C-18312G 3 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or c

14、ontract (see 6.2). DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-C-18312/2 - Capacitors, Fixed, Metallized (Paper Plastic or Plastic Film) Dielectric, Direct Current, (Hermetically Sealed in Metal Cases), (Insulated), Style CH09 MIL-C-18312/3 - Capacitors, Fixed, Metallized (Paper Plastic or Plastic Film

15、) Dielectric, Direct Current, (Hermetically Sealed in Metal Cases), (Insulated), Style CH12 MIL-PRF-39022 - Capacitors, Fixed, Metallized, Paper-Plastic Film, or Plastic Film Dielectric, Direct and Alternating Current (Hermetically Sealed in Metal Cases), Established Reliability, General Specificati

16、on for. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-1285 - Marking or Electrical and Electronic Parts. (Copies of these documents are available online at https:/assist.dla.mil/quicksearch/ or from the Standardization Document Orde

17、r Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents are those listed in the solicitation or contract. ASTM

18、INTERNATIONAL (ASTM) ASTM D92 - Standard Test Method for Flash and Fire Points by Cleveland Open Cup. (Copies of this document are available online at www.astm.org or from ASTM International, 100 Bar Harbor Drive, West Conshohocken, PA 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO

19、) ISO 10012 - Measurement Management Systems - Requirements for Measurement Processes and Measuring Equipment. (Copies of this document are available online at www.iso.org or from International Organization for Standardization, 1, ch. de la Voie-Creuse, Case postale 56 - CH-1211 Geneva 20, Switzerla

20、nd.) NATIONAL CONFERENCE OF STANDARDS LABORATRIES (NCSL) NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment,. (Copies of this document are available online at www.ncsli.org or from NCSL International, 1800 30th Street, Suite 305, Boulder, CO 80701-1026.) 2.4 Order of prec

21、edence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets) the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws a

22、nd regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18312G 4 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance wit

23、h the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. 3.2 Qualification. Capacitors furnished under this specification shall be products that are authorized by the qualifying activity fo

24、r listing on the applicable qualified products list before contract award (see 4.4 and 6.3 ). 3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the capacitors to meet the performance requirements of t

25、his specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.3.1 Insulating, impregnating, and sealing compounds. Insulating, impregnating, and sealing compounds, including varnish and similar materials, shall

26、 be chemically inactive with respect to the capacitor unit and the case (see 3.4.3). The compound, either in the state of original application or as a result of having aged, shall have no adverse effect on the performance of the capacitor. For liquid-filled capacitors (see 6.6.1), the same material

27、shall be used for impregnating as is used for filling. 3.3.2 Metals. Metals shall be of a corrosion-resistant type or shall be plated or treated to resist corrosion. 3.3.2.1 Iron and steel. The use of ferrous material for current-carrying parts shall not be permitted, except that annealed copper-cla

28、d steel wire (30-percent minimum conductivity) may be substituted as terminal leads (see 3.4). 3.3.2 2 Dissimilar metals. Where dissimilar metals are used in intimate contact with each other, provision shall be made to provide protection against electrolysis and corrosion. The use of dissimilar meta

29、l in contact, that may tend toward active electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy), shall not be acceptable; however, metal-plating or metal spraying of dissimilar metals onto base metals to provide similar or suitable abutting sur

30、faces, shall be permitted (for example, the spraying of copper on aluminum for soldering operations, shall be allowed). The use of dissimilar metals separated by insulating material shall also be permitted. 3.4 Design and construction. The capacitors and brackets shall be of the design, construction

31、, and physical dimensions specified (see 3.1). 3.4.1 Terminals. 3.4.1.1 Solder-lug terminals. Solder-lug terminals may be of any shape, provided dimensional limits are met, and shall be coated with solder having a tin content of 40 to 70 percent. 3.4.1.2 Axial wire-lead terminals. Leads may be of so

32、lder coated solid copper wire, copper alloy, or copper clad steel (see 3.3.2.1). Copper alloy or copper clad leads shall have a minimum of 30 percent of the conductivity of electrolytic copper. The leads shall be coated with solder having a tin content of 40 to 70 percent. 3.4.2 Case. Each capacitor

33、 shall be enclosed in a hermetically sealed metal case that will protect the capacitor element from moisture, impregnant leakage, and mechanical damage under the test conditions specified herein. The use of exterior cardboard sleeves for insulating purposes shall not be permitted. 3.4.3 Capacitor el

34、ement. The capacitor element shall consist of metallized paper, paper plastic, or plastic film. The capacitor element may be separated by uncoated dielectric tissues. 3.4.3.1 Construction. All capacitors shall have extended electrode construction to minimize inductance. Provided by IHSNot for Resale

35、No reproduction or networking permitted without license from IHS-,-,-MIL-C-18312G 5 3.4.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally or externally, including nuts and washers. Tin content of capacitor components and solder shall not exceed 97 perce

36、nt, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.10). Lead-free, tin alloy high temperature solders may be used where high temperature solder is necessary with the approval of the qualifying activity. The tin content of lead-free high temperature solders shall not e

37、xceed 97 percent, by mass. 3.5 Seal. 3.5.1 Liquid or solid impregnated capacitors. When capacitors are tested as specified in 4.7.2, there shall be no evidence of repetitive bubbling. 3.5.2 Liquid-filled capacitors. When liquid-filled capacitors are tested as specified in 4.7.2, there shall be no ev

38、idence of liquid leakage. 3.6 Dielectric withstanding voltage. When tested as specified in 4.7.3, capacitors shall be capable of withstanding the dc potentials specified (see 3.1) without permanent damage, or open-circuiting or short-circuiting. Momentary breakdowns (see 6.6.2) shall be permitted. 3

39、.7 Capacitance. When measured as specified in 4.7.4, the capacitors shall be within the tolerance of the nominal value specified (see 3.1). 3.8 Dissipation factor. When measured as specified in 4.7.5, the dissipation factor of the capacitors shall not exceed the value specified (see 3.1). 3.9 Insula

40、tion resistance (see 6.6.2). 3.9.1 Terminal to terminal. When measured as specified in 4.7.6, the product of the nominal capacitance, expressed in microfarads (F), and the insulation resistance, expressed in megohms, shall be not less than the values specified (see 3.1), as applicable. 3.9.2 Termina

41、l to case. When measured as specified in 4.7.6, where the case is not a terminal, the insulation resistance between terminal and case shall be not less than the value specified (see 3.1). 3.10 Barometric pressure (reduced) (qualification only). When tested as specified in 4.7.7, capacitors shall wit

42、hstand a dc potential equal to 125 percent of rated dc voltage without visible damage, external flashover, or open-circuiting or short-circuiting. 3.11 Vibration. When capacitors are tested as specified in 4.7.8, there shall be no intermittent contacts of 0.5 millisecond (ms) or greater duration, or

43、 momentary arcing, or other indication of breakdown, nor shall there be any open-circuiting or short-circuiting or evidence of mechanical damage (see 6.6.2). 3.12 Salt atmosphere (corrosion). When capacitors are tested as specified in 4.7.9, there shall be no harmful corrosion, and at least 90 perce

44、nt of any exposed metallic surfaces of the capacitor, shall be protected by the finish. Harmful corrosion shall be construed as being any type of corrosion which in any way interferes with mechanical or electrical performance. There shall be no unwrapping of or mechanical damage to insulating sleeve

45、s. In addition, corrosion of the terminal hardware or mounting surface shall not exceed 10 percent of the surface area. Marking shall remain legible. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18312G 6 3.13 Thermal shock and immersion. Whe

46、n tested as specified in 4.7.10, the capacitors and brackets, as applicable, shall meet the following requirements: a. Dielectric withstanding voltage. Insulating sleeves . Not less than 4,000 volts dc. Terminal to terminal 150 percent of rated dc voltage. Terminal to case (where the case is not a t

47、erminal) . As specified (see 3.1). b. Capacitance. Capacitance value shall be within 10 percent of the initial value obtained when measured as specified in 4.7.4. c. Dissipation factor. Dissipation factor value shall be not more than 110 percent of the initial requirement (see 3.8). d. Insulation re

48、sistance. Insulating sleeves Not less than 100 megohms. Terminal to terminal . Not less than 1/3 of value specified in 3.9.1. Terminal to case (where the case is not a terminal) Not less than 1/2 of value specified in 3.9.2. After the test, capacitors shall show no indication of extensive corrosion

49、or obliteration of marking. There shall be no unwrapping of or mechanical injury to insulating sleeves (where applicable). 3.14 Solderability (axial wire leads only). When capacitors are tested as specified in 4.7.11, the dipped surface of the capacitor leads shall be at least 95 percent covered with a new, smooth, solder coating. The remaining 5 percent of the lead surface may show only small pinholes or rough spots; these shall not be conc