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. 09 May 01 K. Cottongim C Removal of Vendor. Update to present DoD
2、 policy requirements. Extensive editorial changes throughout. 25 Jan 06 M. Radecki D Inactivation for new design. Editorial changes throughout. 19 Feb 10 M. Radecki Prepared in accordance with ASME Y14.100 Source control drawing REV STATUS OF PAGES REV D D D D D D D PAGES 1 2 3 4 5 6 7 PMIC N/A Orig
3、inal date of drawing 29 July 1994 PREPARED BY Heraldine Johnson DEFENSE ELECTRONICS SUPPLY CENTER DAYTON, OH CHECKED BY Andrew R. Ernst TITLE RESISTORS, CHIP, FIXED, BULK METAL FOIL, ULTRA PRECISION, STYLE 2110 APPROVED BY David E. Moore SIZE A CODE IDENT. NO. 14933 DWG NO. 93078 REV D PAGE 1 OF 7 A
4、MSC N/A 5905-E739 CURRENT DESIGN ACTIVITY CAGE CODE 037Z3 DEFENSE LOGISTICS AGENCY DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO 43216-5000 DSCC drawing 93078 is inactive for new design and is use for replacement purposes only. For new design, use DSCC drawing 06001 Provided by IHSNot for ResaleNo
5、reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93078 REV D PAGE 2 1. SCOPE 1.1 Scope. This drawing describes the requirements for a bulk metal foil, ultra precision, chip resistor, style 2110. 1.2
6、Part or Identifying Number (PIN). The complete PIN is as follows: 93078 - * * 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 t
7、his document to the extent specified herein. Unless 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 Re
8、liability, Space Level, General Specification for. DEPARTMENT 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 Op
9、tic Parts Specifications. * (Copies of these documents 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 ev
10、ent 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 and regulations unless a specific exemption has been obtained. 3. R
11、EQUIREMENTS 3.1 Item requirements. The individual item requirements shall be as specified herein. 3.2 Interface and physical dimensions. The interface and physical dimensions shall be as specified in MIL-PRF-55342 and herein (see figure 1). Passivation is not applicable, however, a protective coatin
12、g over the element shall be provided. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93078 REV D PAGE 3 L W T (max) D mm 5.21 Inch 0.205 mm 2.41 Inch 0.095 mm 0.64 I
13、nch 0.025 mm 0.46 Inch 0.018 NOTES: 1. Dimensions are in millimeters. Inch equivalents are given for general information only. 2. 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 en
14、velope and do not alter the functional aspects of the device, are acceptable. 3. Tolerances shall be 0.13 mm (0.005 inch) unless otherwise specified. FIGURE 1. Chip resistor. 3.3 Electrical characteristics. 3.3.1 Resistance. The nominal resistance expressed in ohms is identified by six characters, c
15、onsisting of five digits and a letter. The letter 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 tha
16、n 1 megohm, the letter “K“ is used to denote that a decimal point is located three places to the right. 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 sh
17、all be as specified herein. The standard values for every decade shall follow the sequence 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
18、 preferred that values be chosen from the “B“ column of the 10 to 100 decade table of MIL-PRF-55342. The resistance values for tolerance D shall follow the standard values listed under tolerance B of MIL-PRF-55342. 3.3.2 Resistance range. The resistance range shall be from 5 ohms to 100 kilohms (see
19、 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. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO
20、. 14933 DWG NO. 93078 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 10.0 100 1000 10000 100000 to to to to to to 9.88 98
21、.8 988 9880 98800 988000 incl. incl. incl. incl. incl. incl. TABLE II. Resistance tolerance. 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 3.3.3.1 Resistance tolerance versus resistance value. The tightest resistance tolerance available is value specific as indica
22、ted by the following. Resistance (ohms) Tolerance (percent) 5 10 25 50 100 250 to to to to to to 10 25 50 100 250 100 ohms ohms ohms ohms ohms kohms 0.5 0.25 0.1 0.05 0.02 0.01 3.3.4 Power rating. The power rating for chip resistors shall be .200 watt at +70OC derated to +125OC at zero power (see fi
23、gure 2). 3.3.5 Voltage rating. The maximum continuous working voltage shall not exceed 140 volts. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93078 REV D PAGE 5 F
24、IGURE 2. Derating curve. 3.3.6 Resistance temperature coefficient. The resistance temperature coefficient shall not exceed the values specified below: Characteristic Resistance range 20 ppm/OC 5 ohms to 50 ohms 10 ppm/OC 50 ohms to 100 ohms 5 ppm/OC 100 ohms to 100 kohms 3.3.7 Termination. The termi
25、nation material shall be in accordance with MIL-PRF-55342, code letter B. 3.3.7.1 Pure tin. The use 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 wi
26、th a minimum of 3 percent lead, by mass (see 6.3). 3.4 Thermal shock. When resistors are tested as 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
27、 low temperature operation the change in resistance shall not exceed 0.05 percent +0.01 ohm. 3.6 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
28、resistors are tested as specified in MIL-PRF-55342 for high temperature exposure the change in resistance 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 s
29、hall not exceed 0.05 percent +0.01 ohm. 3.9 Moisture resistance. When resistors are tested as specified 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
30、IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93078 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
31、 resistors are tested as specified in MIL-PRF-55342 except the RTC shall not exceed the values specified (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 iden
32、tification code, the date code, and the lot code. At the option of the manufacturer, the resistor 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
33、 shall be listed on the MIL-PRF-55342 Qualified Products List for at least one part, or perform the 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 manufac
34、turers requesting to be listed as an approved source of supply (see 6.2d). 3.14 Recycled, recovered, 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 ope
35、rational and maintenance requirements and promotes economically advantageous life cycle costs. 3.15 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 assura
36、nce program. The product assurance program specified in MIL-PRF-55342 and maintained in accordance 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
37、Conformance inspection. 4.3.1 Inspection of product for delivery. Inspection of product for delivery 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 activit
38、y may accept a certificate of compliance in lieu of Group B inspection (see 6.2d). 5. PACKAGING 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 pe
39、rsonnel, these personnel need to contact the responsible packaging activity to ascertain requisite 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 Ser
40、vices System Command. Packaging data retrieval is available from the managing Military Departments 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
41、from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 93078 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 t
42、hick or thin film circuits where microcircuity is intended, also, for use in surface mounting application. 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 certifi
43、cate of compliance that parts have passed conformance inspection with each shipment of parts by the 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.
44、 The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker growth 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 coa
45、tings applied over top of a whisker-prone surface will not prevent the formation of tin whiskers. 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 o
46、f Tin). 6.4 Tolerance caution. Soldering temperature used during installation may cause resistance 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 applicatio
47、ns, damage and premature failure are possible. These resistors only see a one time pulse (Short-time 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 u
48、sers of record of this document. Requests to be added as a recorded user of this drawing may be achieved online at resistordla.mil * 6.7 or in writing to: DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990 or by telephone (614) 692-0552 or DSN 850-0552. Approved source of supply. Approved sourc
49、e 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.milor 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 typ
