93075

REVISIONS
LT
DESCRIPTION
DATE
APPROVED
A
Changes in accordance with NOR 5905-R013-95.
B
Changes in accordance with NOR 5905-R017-95.
30 Oct 1995
D. Moore
C
Changes to paragraphs 3.3.2, 3.3.3, 3.3.10, and
4.8. Deleted paragraph 3.3.6 Voltage rating.
Editorial changes throughout.
Changes in accordance with NOR 5905-R001-98.
8 Jul 1997
D. Moore
3 Apr 1998
D. Moore
3 Dec 2003
K. Cottongim
30 Oct 2006
M. Radecki
D
E
21 Oct 1994
Update and validation of drawing. Editorial
changes throughout.
Add pure tin prohibition paragraph. Editorial
changes throughout.
F
D. Moore
CURRENT DESIGN ACTIVITY CAGE CODE 037Z3
DEFENSE LOGISTICS AGENCY
DEFENSE SUPPLY CENTER, COLUMBUS
COLUMBUS, OHIO 43218-3990
Prepared in accordance with AMSE Y14.100
REV STATUS
OF PAGES
PMIC N/A
Selected item drawing
REV
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PAGES
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PREPARED BY
HERALDINE JOHNSON
DESIGN ACTIVITY:
DEFENSE ELECTRONIC SUPPLY CENTER
DAYTON, OHIO 45444-5000
Original date of
drawing
CHECKED BY
ANDREW ERNST
TITLE
RESISTOR, FIXED, WIREWOUND, SURFACE MOUNT,
POWER TYPE (1/2 WATT)
11 July 1994
APPROVED BY
DAVID E. MOORE
SIZE
A
REV
AMSC N/A
CODE IDENT. NO.
14933
DWG NO.
F
PAGE
93075
1
OF
6
5905-E629
1. SCOPE
1.1 Scope. This drawing describes the requirements for a 1/2 watt, fixed, surface mounted, wirewound, power type
resistor.
1.2 Part or Identifying Number (PIN). The complete PIN is as follows:
93075
I
I
Drawing
number
****
I
I
Resistance value
(see 3.3.1, 3.3.2)
*
I
I
Tolerance
(see 3.3.3)
2. APPLICABLE DOCUMENTS
2.1 Government documents.
2.1.1 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 contract.
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-PRF-39007
-
Resistors, Fixed, Wirewound (Power Type), Nonestablished Reliability, Established
Reliability, and Space Level, General Specification for.
DEPARTMENT OF DEFENSE STANDARDS
MIL-STD-202
MIL-STD-690
MIL-STD-790
-
MIL-STD-1285
-
Test Methods for Electronic and Electrical Component Parts.
Failure Rate Sampling Plans and Procedures.
Established Reliability and High Reliability Qualified Products List (QPL) Systems for
Electrical, Electronic, and Fiber Optic Parts Specifications.
Marking of Electrical and Electronic Parts.
(Copies of these documents are available online at http://assist.daps.dla.mil/quicksearch/ or http://assist.daps.dla.mil/ or
from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
2.2 Order of precedence. 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. REQUIREMENTS
3.1 Item requirements. The individual item requirements shall be in accordance with MIL-PRF-39007 and as specified
herein.
3.2 Interface and physical dimensions. Resistors shall meet the interface and physical dimensions as specified in
MIL-PRF-39007 and herein (see figure 1).
DEFENSE ELECTRONIC SUPPLY CENTER
DAYTON, OHIO
SIZE
CODE IDENT NO.
A
14933
REV F
DWG NO:
93075
PAGE
2
Dimensions
A
B
C
D
E
F
G
(4.77 ±.127)
.188 ±.005
(5.08 ±.508)
.200 ±.020
(1.02 ±.254)
.040 ±.010
(2.44 ±.381)
.096 ±.015
(2.29 ±.127)
.090 ±.005
(3.18 ±.127)
.125 ±.005
(1.27 ±.254)
.050 ± .010
NOTES:
1. Dimensions are in inches, millimeters are in parentheses.
2. Inch equivalents are given for general information only.
FIGURE 1. Resistor, fixed, wirewound, surface mount.
3.3 Electrical characteristics.
3.3.1 Resistance value designation. Resistance value designations shall be in accordance with MIL-PRF-39007.
3.3.2 Resistance. The resistance range shall be .1 ohm to 4.99 kilohms.
3.3.3 Resistance tolerance. Resistance tolerances are available in (D) ±0.5 percent (for values above 1 ohm),
(F) ±1 percent, (H) ±3 percent, and (J) ±5 percent.
3.3.4 Power rating. The power rating shall be 1/2 watt at +70°C. For operation at temperatures greater than +70°C,
derate in accordance with figure 2.
3.3.5 Resistance temperature coefficient. The resistance temperature coefficient shall be as follows:
0.1 ohm to 0.99 ohm----------------±90 ppm/°C
1.0 ohm to 9.9 ohm------------------±50 ppm/°C
3.3.6 Thermal shock. When resistors are tested as specified in 4.6, there shall be no evidence of mechanical damage.
The maximum change in resistance shall not exceed ± (0.2 percent +0.05 ohm).
3.3.7 Load life. When resistors are tested as specified in 4.7, there shall be no evidence of mechanical damage. The
maximum change in resistance shall not exceed ± (0.5 percent +0.05 ohm).
3.3.8 Overload. When resistors are tested as specified in 4.8, there shall be no evidence of electrical or mechanical
damage. The maximum change in resistance shall not exceed ± (0.2 percent + 0.005 ohm).
3.3.9 Solderability. The total surface area of the dipped part of the termination is at least 95 percent covered by a
continuous new solder coating. Pin holes, voids, porosity, nonwetting, or dewetting shall not be concentrated in one area
and shall not exceed 5 percent of the total termination area. The area of the surface to be tested shall include the total
metallized areas of both terminations within .3125 inch (7.938 mm) of the bottom contact point of the "J" bend. In case of a
dispute, the percentage of coverage with pinholes or voids shall be determined by actual measurement of these areas, as
compared to the total area.
DEFENSE ELECTRONIC SUPPLY CENTER
DAYTON, OHIO
SIZE
CODE IDENT NO.
A
14933
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DWG NO:
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FIGURE 2. Derating curves for high ambient temperatures.
3.3.10 High temperature exposure. When resistors are tested as specified in 4.10, there shall be no evidence of
mechanical damage. The maximum change in resistance shall not exceed ± (0.5 percent +0.05 ohm).
3.4 Marking. Marking shall be as shown:
93075 (DSCC drawing number)
1R00F (resistance value, and tolerance)
XXXXX (CAGE code)
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 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 advantageous life cycle costs.
3.7 Certificate of compliance. A certificate of compliance shall be required from manufacturers requesting to be a
suggested source of supply.
3.8 Workmanship. The resistor shall be uniform in quality and free from any defects that will affect life, serviceability, or
appearance.
4. VERIFICATION
4.1 Qualification inspection. Qualification inspection is not applicable to this document.
4.2 Reliability assurance program. The reliability assurance program specified in MIL-PRF-39007 and maintained in
accordance with MIL-STD-790 is not applicable to this document.
4.3 Failure rate qualification. Failure rate qualification specified in MIL-PRF-39007 and MIL-STD-690 is not applicable
to this document.
4.4 Conformance inspection. Conformance inspection shall consist of group A (ER level) and group B inspections of
MIL-PRF-39007. Group A, subgroup 1 conditioning will not be performed.
4.4.1 Certification. The activity, at its discretion, may accept a certificate of compliance with group B requirements in
lieu of performing group B tests (see 6.2d).
DEFENSE ELECTRONIC SUPPLY CENTER
DAYTON, OHIO
SIZE
CODE IDENT NO.
A
14933
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DWG NO:
93075
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4.5 Inspection of packaging. Inspection of packaging shall be in accordance with MIL-PRF-39007.
4.6 Thermal shock. Resistors shall be tested in accordance with MIL-PRF-39007 and the following exception shall
apply: Mounting of test samples shall be on surface mount test cards, and Method 107 of MIL-STD-202, test condition
B-3.
4.7 Load life. Resistors shall be tested in accordance with MIL-PRF-39007 and the following exception shall apply:
Mounting of test samples shall be on surface mount test cards, and 1,000 hours at maximum load at +25°C.
4.8 Overload. Resistors shall be tested in accordance with MIL-PRF-39007 and the following exception shall apply:
Mounting of test samples shall be on surface mount test cards, and Overload testing will be performed at 5 times rated
power for 5 seconds.
4.9 Solderability. Solderability shall be in accordance with method 208 of MIL-STD-202 and the following details shall
apply:
a. Application of flux: Type R shall be used. Terminations shall be immersed in the flux, which is at room
temperature, to the minimum depth necessary to cover the surface to be tested. The terminations shall be
completely immersed by individually dipping each termination. The terminations to be tested shall be immersed in
the flux for a period of 5 seconds to 10 seconds.
b. Solder dip: The dross and burned flux shall be skimmed from the surface of the molten solder (may not require
separate operation in wave or flow pot). The molten solder shall be maintained at a uniform temperature of
+245°C ±5°C. The surface of the molten solder shall be skimmed again prior to immersing the terminations in the
solder. The part shall be attached to a dipping device and the flux-covered terminations immersed in molten
solder to the depth, and in the same manner specified in 4.9a. After the dipping process, the part shall be allowed
to cool in air. Residue flux shall be removed from the terminations by rinsing in a suitable solvent. If necessary, a
soft cloth or cotton swab moistened with clean 91 percent isopropyl alcohol shall remove all remaining flux.
c.
Examination of terminations: After each dip-coated termination has been thoroughly cleaned of flux, the
terminations shall be examined under a magnification between 10X and 20X.
4.10 High temperature exposure. Resistors shall be tested in accordance with MIL-PRF-39007 and the following
exception shall apply: Mounting of test samples shall be on surface mount test cards, and 250 hours at +125°C.
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 personnel, these personnel need to
contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained
by the Inventory Control Point's packaging activity within the Military Department or Defense Agency, or within the military
service’s system commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging 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. Surface mount resistors are used in electronic circuits where space is a major concern.
DEFENSE ELECTRONIC SUPPLY CENTER
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CODE IDENT NO.
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14933
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93075
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6.2 Ordering data. The contract or purchase order should specify the following:
a. Complete PIN.
b. Requirements for delivery and one copy of the conformance inspection data or certification of compliance that
parts have passed conformance inspection with each shipment of parts by the manufacturer.
c.
Requirements for packaging and packing.
d. Whether the manufacturer performs the group B tests or provides certification of compliance with group B
requirements.
6.3 Tin whisker growth. 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 coatings 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 of Tin).
6.4 User of record. Coordination of this document for future revisions is coordinated only with the suggested source of
supply and the users of record of this document. Requests to be added as a recorded user of this drawing may be
achieved online at [email protected] or in writing to: DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990 or by
telephone (614) 692-0552 or DSN 850-0552.
6.5 Suggested source of supply. Suggested 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 [email protected] 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
Vendors similar
designation or type
number 1/
Vendor
CAGE
93075
WSC – 1/2
91637
Vendor's name
and address
Dale Electronics, Inc.
P.O. Box 609
Columbus, NE 68601-0609
Plant:
Electronica Dale de Mexico, S.A. de C.V.
Insurgentes 606 PT. CD.,
Juarez, Chihuahua MEXICO
1/ Parts must be purchased to the DSCC PIN to assure that all performance requirements and tests are met.
DEFENSE ELECTRONIC SUPPLY CENTER
DAYTON, OHIO
SIZE
CODE IDENT NO.
A
14933
REV F
DWG NO:
93075
PAGE
6
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