1、 REVISIONS LT DESCRIPTION DATE APPROVED A Add resistance to soldering heat and solderability test methods. Editorial changes throughout. 29 JUN 90 D. Moore B Add dimension to X termination and corrected vendor change number. Editorial changes throughout. 13 AUG 93 D. Moore C Changes in accordance wi
2、th NOR 5905-R016-95. 16 JUN 95 D. Moore D Remove vendor. Editorial changes throughout. 1 JUN 00 K. Cottongim E Pure tin prohibition added. Editorial changes throughout. 17 NOV 09 M. Radecki F Change to paragraph 3.7 (Marking) 10 DEC 09 M. Radecki Prepared in accordance with ASME Y14.100 Source contr
3、ol drawing REV STATUS OF PAGES REV F F F F F F F F PAGES 1 2 3 4 5 6 7 8 PMIC N/A PREPARED BY Allen R. Knox DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON OHIO Original date of drawing 26 September 1988 CHECKED BY David E. Moore TITLE RESISTOR, VARIABLE, SURFACE MOUNT, NONWIREWOUND, TRIMMER APPROVED BY D
4、avid E. Moore SIZE A CODE IDENT. NO. 14933 DWG NO. 88040 REV F PAGE 1 OF 8 AMSC N/A 5905-E733 CURRENT DESIGN ACTIVITY CAGE CODE 037Z3 DEFENSE LOGISTICS AGENCY DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS OHIO 43218-3990 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
5、 from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 88040 REV F PAGE 2 1. SCOPE 1.1 Scope. This drawing describes the requirements for a variable, surface mount, nonwirewound (adjustment type, lead screw actuated) resistor. 1.2 Part or Identifying Number
6、 (PIN). The complete PIN is as follows: 88040 -* * Drawing Number Termination (see 3.3.4) Resistance (see 3.3.1) 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 spec
7、ified 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-22097 - Resistors, Variable, Non-wirewound, (Adjustment Type), General Specification for. DEPARTMENT OF DEFENSE
8、 STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-690 - Failure Rate Sampling Plans and Procedures MIL-STD-790 - Established Reliability and High Reliability Qualified Products List (QPL) Systems for Electrical, Electronic, and Fiber Optic Parts Specificati
9、ons. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (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 o
10、therwise noted herein or in the event of a conflict between the text of this document and the references cited herein, 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. REQUIREME
11、NTS 3.1 Item requirements. The individual item requirements shall be in accordance with MIL-PRF-22097 and as specified herein. 3.2 Interface, and physical dimensions. The resistor shall meet the interface, and physical dimensions as specified in MIL-PRF-22097 and herein (see figure 1). Provided by I
12、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 88040 REV F PAGE 3 X termination P termination FIGURE 1. Termination styles Provided by IHSNot for ResaleNo reproduction or network
13、ing permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDENT NO. 14933 DWG NO. 88040 REV F PAGE 4 W termination Inches mm Inches mm Inches mm Inches mm Inches mm 0.001 0.03 0.020 0.51 0.070 1.78 0.170 4.32 0.280 7.11 0.010 0.25 0.040 1.02 0.090 2.29 0.
14、200 5.08 0.016 0.41 0.060 1.52 0.100 2.54 0.250 6.35 NOTES: 1. Dimensions are in inches. Metric equivalents are given for general information only. 2. Unless otherwise specified, tolerance shall be .02 for two place decimals and .015 for three place decimals. FIGURE 1. Termination styles Continued.
15、3.3 Electrical characteristics. 3.3.1 Resistance range. The resistance range shall be from 10 ohms to 1 megohms. Nominal resistance values are as specified in table I. 3.3.2 Resistance tolerance. The resistance tolerance shall be 10 percent. 3.3.3 Power rating. The power rating shall be 250 milliwat
16、ts at +85OC. For operation at temperatures higher than +85OC, derated in accordance with figure 2. 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. 88040 REV F PAGE 5
17、TABLE I. Resistance value designation and nominal resistance value. Resistance value designation Nominal resistance value (ohms) Resistance value designation Nominal resistance value (ohms) 100 10 103 10,000 200 20 203 20,000500 50 253 25,000101 100 503 50,000 201 200 104 100,000501 500 204 200,0001
18、02 1,000 254 250,000 202 2,000 504 500,000502 5,000 105 1,000,000FIGURE 2. Derating curve. 3.3.4 Termination. Resistors are available in P, W, and X terminations in accordance with figure 1. 3.3.5 Voltage. The maximum voltage shall be 300 volts. 3.3.6 End resistance. The maximum end resistance shall
19、 be 1 percent of the resistance value or 1 ohm, whichever is greater. 3.3.7 Contact resistance variation. The contact resistance variation shall be 3 percent of the resistance value or 3 ohms, whichever is greater. 3.3.8 Temperature range. The temperature range shall be -65OC to +150OC. 3.3.9 Temper
20、ature coefficient. The temperature coefficient shall be 100 ppm/OC maximum. 3.3.10 Insulation resistance. The insulation resistance shall be 1,000 megohms minimum. 3.3.11 Electrical continuity. Electrical continuity shall be continuous for full mechanical range. 3.3.12 Resolution. The resolution sha
21、ll be essentially infinite. Percent of rated power-65 -45 -25 0 25 45 65 85 105 125 145 165 Temperature (OC) 150OC 100 80 60 40 20 0 85OC Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE IDEN
22、T NO. 14933 DWG NO. 88040 REV F PAGE 6 3.3.13 Dielectric strength. When resistors are tested as specified in 4.5, there shall be no evidence of mechanical damage, arching, or breakdown. The leakage current shall not exceed 1 milliampere. 3.4 Mechanical characteristics. 3.4.1 Actual electrical travel
23、. The actual electrical travel shall be 12 turns nominal. 3.4.2 Shaft torque. The maximum shaft torque shall be 3 ounce-inches maximum. 3.4.3 Rotational life. When resistors are tested as specified in 4.6, the change in total resistance shall not exceed 3 percent. There shall be no evidence of mecha
24、nical damage. 3.4.5 Resistance to soldering heat. When resistors are tested as specified in 4.7, there shall be no evidence of mechanical damage. The change in resistance shall not exceed 1 percent. 3.4.6 Solderability. When resistors are tested as specified in 4.8, there shall be no evidence of mec
25、hanical damage. 3.5 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 with a minimum of 3 percent lead, by mass (see 6.3). 3.6 Environ
26、mental characteristics. Environmental characteristics shall be in accordance with MIL-PRF-22097, characteristic F. 3.7 Marking. Marking shall be accordance with MIL-STD-1285, except the resistors shall be marked with the PIN assigned herein (see 1.2) and manufacturers identification code (CAGE or lo
27、go). 3.8 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 operational and maintenance requirements, and promotes economically advant
28、ageous life cycle costs. 3.9 Manufacturer eligibility. To be eligible for listing as a approved source of supply, a manufacturer shall be listed on the MIL-PRF-22097 Qualified Products List for at least one part, or perform the group A and group B inspections specified herein on a sample of parts ag
29、reed upon by the manufacturer and DSCC-VA. 3.9.1 Certificate of compliance. A certificate of compliance shall be required from manufacturers requesting to be a approved source of supply. 3.10 Workmanship. Resistors shall be uniform in quality and free from defects that will affect life, serviceabili
30、ty, or appearance. 4. VERIFICATION 4.1 Product assurance program. The product assurance program specified in MIL-PRF-22097 and maintained in accordance with MIL-STD-790 is not applicable to this document. 4.2 Qualification inspection. Qualification inspection is not applicable to this document. 4.3
31、Product level qualification. The product level qualification specified in MIL-PRF-22097 and MIL-STD-690 is not applicable to this document. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEFENSE ELECTRONICS SUPPLY CENTER, DAYTON, OHIO SIZE A CODE ID
32、ENT NO. 14933 DWG NO. 88040 REV F PAGE 7 4.4 Conformance inspection. 4.4.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B inspection of MIL-PRF-22097. 4.4.1.1 Certification. The procuring activity may accept a certificate of compliance in
33、lieu of Group B inspection. 4.5 Dielectric strength. Dielectric strength shall be in accordance with MIL-PRF-22097. The following details and exceptions shall apply: a. 600 V rms: Sea level. b. 250 V rms: 80,000 feet. 4.6 Rotational life. Rotational life shall be in accordance with MIL-PRF-22097. Th
34、e following detail and exception shall apply: 200 cycles. 4.7 Resistance to soldering heat. The requirements for resistance to soldering heat shall be as follows: a. Measure total resistance (Rt1). b. Subject units to 215OC for 3 minutes. (Using boiling FC-70 fluorinent vapors as temperature medium.
35、) c. After a minimum of 3 hours, measure total resistance (Rt2). d. Calculate total resistance shift (TRS) by using the following formula: TRS=Rt2 Rt1X100 Rt1e. This test will be performed before the leads are trimmed and formed into the surface mount terminals. 4.8 Solderability. The requirements f
36、or solderability shall be as follows: a. Steam age in accordance with method 208 of MIL-STD-202 , 8 hours. b. Apply solder paste of a composition of 60 percent tin, 40 percent lead, to the middle of the terminal. A sufficient amount of paste is a bead that will cover the entire terminal with a minim
37、um of .005 inch (0.13 mm) thickness on the mounting surface. c. The entire unit shall then be immersed at a rate of 1 .250 inch (25.4 6.35 mm) per second into boiling fluorinent vapors (FC-70) at 215OC 5OC for 30 seconds, and then removed at a rate 1 .250 inch per second. d. After dipping, clean the
38、 flux from the terminal with isopropyl alcohol. e. Examine the terminals under 10X magnification. f. The terminal mounting area shall be coated with at 90 percent, by a continuous new solder coating, with pin holes and voids not concentrated in any one area and do not exceed 5 percent of total mount
39、ing area. 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. 88040 REV F PAGE 8 5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall be
40、 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 packaging requirements. Packaging requirements are maintained by the Inventory Cont
41、rol Points packaging activity within the Military Service or Defense Agency, or within the military services system commands. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM products, or by contacting the responsible p
42、ackaging activity. 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
43、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
44、he manufacturer. c. Packaging requirements (see 5.1). d. Whether the manufacturer performs the group B tests or provides certificate of compliance with group B (see 4.4.1.1). 6.3 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker growth p
45、roblems 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. Allo
46、ys 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 Users of record. Coordination of this document for future revisions is coordinated only wi
47、th the approved sources of supply and the users of record of this document. Requests to be added as a recorded user of this drawing may be achieved on-line at resistordla.mil or in writing to: DSCC-VAT, P.O. Box 3990, Columbus, OH 43218-3990 or by telephone (614) 692-8754 or DSN 850-8754. 6.5 Approv
48、ed sources of supply. Approved sources of supply are listed herein. Additional sources will be added as they become available. Assistance in the use of this drawing may be obtained on on-line at resistordla.mil or contact DSCC-VAT, P.O. Box 3990, Columbus, OH 43218-3990, or by telephone (614) 692-8754 or DSN 850-8754. DSCC drawing PIN Vendors similar designation or type number 1/ VendorCAGE Vendors name and address 88040-W* 88040-P* 88040-X* 3269W-*-* 3269P-*-* 3269X-*-* 32997 Bourns, Incorporated 1200 Columbia Avenue Riverside, CA 92507-2114 1/ Parts must be purchased to the DSCC PIN t
