1、 REVISIONS LTR DESCRIPTION DATE APPROVED A Add new source of supply. Update to present DoD policy requirements. Extensive editorial changes throughout. 14 July 1998 M. Radecki B Add Group B certification. Editorial changes throughout. 9 May 2001 K. Cottongim C Changes in accordance with NOR 5905-R00
2、7-03. 13 Feb 2003 K. Cottongim D Inactivation for new design. Editorial changes throughout. 19 Feb 2010 M. Radecki Prepared in accordance with ASME Y14.100 Source control drawing REV STATUS REV D D D D D D D OF PAGES PAGES 1 2 3 4 5 6 7 PMIC N/A PREPARED BY Herald Johnson DEFENSE SUPPLY CENTER, COLU
3、MBUS COLUMBUS, OH Original date of drawing CHECKED BY Andrew R. Ernst TITLE RESISTORS, FIXED, BULK METAL FOIL, CHIP, ULTRA PRECISION, STYLE 1505 29 July 1994 APPROVED BY David E. Moore SIZE A CODE IDENT. NO. 14933 DWG NO. 93079 REV D PAGE 1 OF 7 AMSC N/A 5905-E740 CURRENT DESIGN ACTIVITY CAGE CODE 0
4、37Z3 DEFENSE LOGISTICS AGENCY DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO 43216-5000 DSCC drawing 93079 is inactive for new design. Suggestive replacement for new and existing design, use DSCC drawing 03010 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
5、IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93079 REV D PAGE 2 1. SCOPE 1.1 Scope. This drawing describes the requirements for a bulk metal foil, ultra precision, chip resistor, style 1505. 1.2 Part or Identifying Number (PIN). The complete PIN shall is
6、 as follows: 93079- * * Drawing number Resistance value (see 3.3.1) Tolerance (see 3.3.3) 2. APPLICABLE DOCUMENTS 2.1 Government documents. * 2.1.1 Specifications and standards. The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless
7、otherwise specified, the issues of these documents are those listed in the cited in the solicitation or contract (see 6.2). DEPARTMENT OF DEFENSE SPECIFICATION MIL-PRF-55342 - Resistors, Chip, Fixed, Film, Nonestablished Reliability, Established Reliability, Space Level, General Specification for. D
8、EPARTMENT OF DEFENSE STANDARDS MIL-STD-690 - Failure Rate Sampling Plans and Procedures. MIL-STD-790 - Standard Practice for Established Reliability and High Reliability Qualified Products List (QPL) Systems for Electrical, Electronic, and Fiber Optic Parts Specifications. * (Copies of these documen
9、ts are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) * 2.2 Order of precedence. Unless otherwise noted herein or in the event of a conflict between the text of this document
10、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 and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Item requirements. The individual it
11、em requirements shall be as specified herein. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93079 REV D PAGE 3 3.2 Interface and physical dimensions. The interface a
12、nd physical dimensions shall be as specified in MIL-PRF-55342 and herein (see figure 1). Passivation is not applicable, however, a protective coating over the element shall be provided. 3.3 Electrical characteristics. L W T (max) D mm 3.81 Inch 0.150 mm 1.27 Inch 0.050 mm 0.64 Inch 0.025 mm 0.46 Inc
13、h 0.018 NOTES: 1. Dimensions are in millimeters. 2. Inch equivalents are given for general information only. 3. The pictorial view of the styles above is given as representative of the envelope of the item. Slight deviations from the outline shown, which are contained within the envelope and do not
14、alter the functional aspects of the device, are acceptable. 4. Tolerances shall be 0.13 mm (0.005 inch) unless otherwise specified. FIGURE 1. Chip resistor. 3.3.1 Resistance. The nominal resistance expressed in ohms is identified by six characters, consisting of five digits and a letter. The letter
15、is used simultaneously as a decimal point and as a multiplier. For resistance values: a. Greater than or equal to 1 ohm but less than 1,000 ohms, the letter “R“ is used to represent a decimal point. b. Greater than or equal to 1,000 ohms but less than 1 megohm, the letter “K“ is used to represent a
16、decimal point. All digits preceding and following the letters (R or K) of the group represent significant figures. The resistance value designations are shown in table I. Minimum and maximum resistance values shall be as specified herein. The standard values for every decade shall follow the sequenc
17、e specified in the 10 to 100 decade table of MIL-PRF-55342 for resistance tolerances D and F. The resistance values for tolerances Q, T, A, B, and C may be any value within the limits specified herein, but it is preferred that values be chosen from the “B“ column of the 10 to 100 decade table of MIL
18、-PRF-55342. The resistance values for tolerance D shall follow the standard values listed under tolerance B of MIL-PRF-55342. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 D
19、WG NO. 93079 REV D PAGE 4 TABLE I. Designation of resistance values. Designation Resistance ohms 1R0000 to 9R8800 incl. 10R000 to 98R800 incl. 100R00 to 988R00 incl. 1K0000 to 9K8800 incl. 10K000 to 98K800 incl. 100K00 to 988K00 incl. 1.0 to 9.88 incl. 10.0 to 98.8 incl. 100 to 988 incl. 1000 to 988
20、0 incl. 10000 to 98800 incl. 100000 to 988000 incl. 3.3.2 Resistance range. The resistance range shall be from 5 ohms to 33 kilohms (see 3.3.6). 3.3.3 Resistance tolerance. Resistors are available in resistance tolerances as specified in table II and paragraph 3.3.3.1. TABLE II. Resistance tolerance
21、. 3.3.3.1 Resistance tolerance versus resistance value. The tightest resistance tolerance available is value specific as indicated by the following. Resistance (ohms) Tolerance (percent) 5 to 10 ohms 10 to 25 ohms 25 to 50 ohms 50 to 100 ohms 100 to 250 ohms 250 to 33 kohms 0.5 0.25 0.1 0.05 0.02 0.
22、01 3.3.4 Power rating. The power rating for chip resistors shall be .100 watt at +70C derated to +125C at zero power (see figure 2). Symbol Resistance tolerance percent T Q A B C D F +0.01 0.02 0.05 0.1 0.25 0.5 1.0 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
23、 from IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93079 REV D PAGE 5 FIGURE 2. Derating curve. 3.3.5 Voltage rating. The maximum continuous working voltage shall not exceed 60 volts. 3.3.6 Resistance temperature coefficient. The resistance temperature c
24、oefficient shall not exceed the values specified below: Characteristic Resistance range 20 ppm/C 5 ohms to 50 ohms 10 ppm/C 50 ohms to 100 ohms 5 ppm/C 100 ohms to 33 kohms 3.3.7 Termination. The termination material shall be in accordance with MIL-PRF-55342, code letter B. * 3.3.7.1 Pure tin. The u
25、se of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of resistor components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3). 3.4 Thermal shock. When resistors are tested a
26、s specified in MIL-PRF-55342 for thermal shock the change in resistance shall not exceed 0.05 percent +0.01 ohm. 3.5 Low temperature operation. When resistors are tested as specified in MIL-PRF-55342 for low temperature operation the change in resistance shall not exceed 0.05 percent +0.01 ohm. 3.6
27、Short time overload. When resistors are tested as specified in MIL-PRF-55342 for short time overload the change in resistance shall not exceed 0.05 percent +0.01 ohm. 3.7 High temperature exposure. When resistors are tested as specified in MIL-PRF-55342 for high temperature exposure the change in re
28、sistance shall not exceed 0.05 percent +0.01 ohm. 3.8 Resistance to bonding exposure. When resistors are tested as specified in MIL-PRF-55342 for resistance to bonding exposure the change in resistance shall not exceed 0.05 percent +0.01 ohm. 3.9 Moisture resistance. When resistors are tested as spe
29、cified in MIL-PRF-55342 for moisture resistance the change in resistance shall not exceed 0.1 percent +0.01 ohm. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93079
30、REV D PAGE 6 3.10 Life. When resistors are tested as specified in MIL-PRF-55342 for life the change in resistance shall not exceed 0.2 percent +0.01 ohm. 3.11 Resistance temperature characteristic. When resistors are tested as specified in MIL-PRF-55342 except the RTC shall not exceed the values spe
31、cified (see 3.3.6). 3.12 Marking. Marking is not required on this resistor; however, each waffle pack and each unit package shall be marked with the PIN assigned herein (see 1.2), the manufacturers identification code, the date code, and the lot code. At the option of the manufacturer, the resistor
32、may be marked (i.e., laser, color dot, etc.). The marking shall remain legible after all tests. * 3.13 Manufacturer eligibility. To be eligible for listing as a approved source of supply, a manufacturer shall be listed on the MIL-PRF-55342 Qualified Products List for at least one part, or perform th
33、e group A and group B inspections specified herein on a sample agreed upon by the manufacturer and DSCC-VA. * 3.13.1 Certificate of compliance. A certificate of compliance shall be required from manufacturers requesting to be listed as an approved source of supply (see 6.2d). 3.14 Recycled, recovere
34、d, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements and promotes economically advantageous life cycle costs. 3.1
35、5 Workmanship. Resistors shall be processed in such a manner as to be uniform in quality and be free from defects that will affect life, serviceability, or appearance. 4. VERIFICATION 4.1 Product assurance program. The product assurance program specified in MIL-PRF-55342 and maintained in accordance
36、 with MIL-STD-790 is not applicable to this document. 4.2 Product level qualification. The product level qualification specified in MIL-PRF-55342 and MIL-STD-690 is not applicable to this document. 4.3 Conformance inspection. 4.3.1 Inspection of product for delivery. Inspection of product for delive
37、ry shall consist of group A inspection (ER level only and ppm reporting, subgroup 1, subgroup 3, are not applicable) and group B inspection of MIL-PRF-55342. 4.3.1.1 Certification. The procuring activity may accept a certificate of compliance in lieu of Group B inspection (see 6.2d). 5. PACKAGING *
38、5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain requisi
39、te packaging requirements. Packaging requirements are maintained by the Inventory Control Points packaging activity within the Military Department or Defense Agency, or within the Military Departments Services System Command. Packaging data retrieval is available from the managing Military Departmen
40、ts or Defense Agencys automated packaging files, CD-ROM products, or by contacting the responsible packaging activity. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 14933 DWG NO.
41、93079 REV D PAGE 7 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. Chip resistors are intended to be used in thick or thin film circuits where microcircuity is intended, also, for use in surface mounting app
42、lication. 6.2 Ordering data. The contract or purchase order should specify the following: a. Complete PIN (see 1.2). b. Requirements for delivery: One copy of the conformance inspection data or a certificate of compliance that parts have passed conformance inspection with each shipment of parts by t
43、he manufacturer. c. Packaging requirements. d. Whether the manufacturer performs the group B tests or provides certification of compliance with group B requirements (see 4.3.1.1). 6.3 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker gro
44、wth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the formation of tin whiskers.
45、 Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin). 6.4 Tolerance caution. Soldering temperature used during installation may cause resistanc
46、e to shift up to 0.05 %. * 6.5 Pulse applications. Designers are CAUTIONED on using the above resistors in high power pulse applications. Since they have not been qualified nor tested for such applications, damage and premature failure are possible. These resistors only see a one time pulse (Short-t
47、ime overload) as part of the group B inspection of MIL-PRF-55342. * 6.6 User of record. Coordination of this document for future revisions is coordinated only with the approved source of supply and the users of record of this document. Requests to be added as a recorded user of this drawing may be a
48、chieved online at resistordla.mil or in writing to: DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990 or by telephone (614) 692-0552 or DSN 850-0552. * 6.7 Approved source of supply. Approved source of supply is listed herein. Additional sources will be added as they become available. Assistance in the use of this drawing may be obtained online at resistordla.mil or contact DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990 or by telephone (614) 692-0552 or DSN 850-0552. DSCC drawing PIN Vendor similar designation or type number 1/ Vendor CAGE Vendor name and address 93079-*
