REVISIONS
LTR
DESCRIPTION
DATE
APPROVED
Prepared in accordance with
ASME Y14.100
REV STATUS
OF PAGES
PMIC N/A
REV
PAGES
1
2
3
4
5
6
7
DLA LAND AND MARITIME
COLUMBUS, OH
Original date of
drawing
3 October
2014
CHECKED BY
Andrew R. Ernst
APPROVED BY
Michael Radecki
SIZE
A
CODE IDENT. NO.
037Z3
DWG NO.
TITLE
PREPARED BY
Andrew R. Ernst
RESISTOR, FIXED, WIREWOUND,
(ACCURATE), 0.25 WATT (RBR54)
14007
PAGE
1
OF
7
5905-2014-E33
REV
AMSC N/A
1. SCOPE
1.1 Scope. This drawing describes the requirements for a fixed, wirewound (accurate), 0.25 watt resistor.
1.2 Part or Identifying Number (PIN). The complete PIN is as shown in the following example:
14007-
|
|
Drawing number
L
|
|
Terminal
(see
3.3.1)
12601
|
|
Resistance
(see
3.3.2)
F
|
|
Tolerance
(see
3.3.3)
*
|
|
Testing requirements
(see
3.3.8)
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
- Resistor, Fixed, Wirewound (Accurate), Nonestablished Reliability, and Established Reliability,
General Specification for.
MIL-PRF-39005/3
- Resistor, Fixed, Wirewound (Accurate), Nonestablished Reliability, and Established Reliability,
Style RBR54.
DEPARTMENT OF DEFENSE 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 Specifications.
(Copies of these documents are available online at
http://quicksearch.dla.mil.)
2.2 Order of precedence. Unless otherwise noted herein or in the contract or 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 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-39005,
and as specified
herein.
3.2 Interface and physical dimensions. The resistor shall meet the interface and physical dimensions as specified in
MIL-PRF-39005/3
and herein (see
figure 1).
MIL-PRF-39005
DLA LAND AND MARITIME
COLUMBUS, OHIO
SIZE
CODE IDENT NO.
037Z3
REV
DWG NO.
A
14007
PAGE
2
Dimension
A
B
C
D
Inches
0.750 +0.020
-0.032
0.250
±0.015
1.500 min
0.032
±0.002
Millimeters
19.05 +0.51
-0.81
6.35
±0.38
38.10 min
0.81
±0.05
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are in parenthesis.
3. Dimension A is 'clean lead to clean lead’.
4. Resistance measurement points for all values of resistance shall be
.375 ±.0625 (9.53 mm ±1.588 mm) from the end of the body.
FIGURE 1. Style RBR54 resistor.
3.3 Electrical characteristics.
3.3.1 Terminal. The terminal is identified by a single letter in accordance with table I.
TABLE I. Terminal.
Symbol
L
U
Terminal
Solderable
Weldable
DLA LAND AND MARITIME
COLUMBUS, OHIO
SIZE
CODE IDENT NO.
037Z3
REV
DWG NO.
A
14007
PAGE
3
3.3.2 Resistance. The nominal resistance is expressed in ohms and is identified by five digits; the first four digits
represent significant figures and the last digit specifies the number of zeroes to follow. When the values of resistance are
less than 1,000 ohms, or when fractional values of an ohm are required, the letter "R" is substituted for one of the
significant digits to represent the decimal point. When the letter "R" is used, succeeding digits of the group represent
significant figures. The resistance value designations are in accordance with
MIL-PRF-39005.
Minimum resistance
values are as specified in
3.3.2.1,
and maximum resistance values are as specified in table II. The standard values for
every decade are in accordance with the “10 to 100” decade table of MIL-PRF-39005. The resistance values for 0.01
percent (T), 0.02 percent (Q), 0.05 percent (A) and 0.1 percent (B) resistance tolerances may be of any value, but it is
preferred that the values are chosen within the “10 to 100” decade table of MIL-PRF-39005.
3.3.2.1 Minimum resistance value and applicable tolerance. Minimum resistance value shall be 0.1 ohm for tolerance F
(±1.0 percent). For tolerances B, A, Q, T (±.10,
±.05, ±.02,
and
±.01
percent, respectively), the minimum resistance value
shall be 0.499 ohms.
3.3.2.2 Maximum resistance value. Maximum resistance values and applicable wire sizes shall be in accordance with
table II.
TABLE II. Maximum resistance values.
Nominal wire size
(inches) diameter
.001
.0009
.0008
Absolute
diameter
.0009
.00081
.00072
Maximum resistance
value
(megohms)
.255
.383
.562
3.3.3 Resistance tolerance. Resistors are available in resistance tolerances in accordance with table III.
TABLE III. Resistance and resistance tolerance.
Initial resistance
tolerance
(at 25°C
±2°C)
±0.01 percent
±0.02 percent
±0.05 percent
±0.10percent
±1.00 percent
Symbol
T
Q
A
B
F
3.3.5 Power rating. The power rating shall be 0.25 watt. Resistors power rating is based on continuous full load
operation at an ambient temperature of +125°C. For temperature in excess of +125°C, the load shall be derated in
accordance with
figure 2.
3.3.6 Voltage rating. The maximum voltage shall be 300 volts direct current or peak.
3.3.7 Maximum weight. The maximum weight shall be 2.5 grams.
DLA LAND AND MARITIME
COLUMBUS, OHIO
SIZE
CODE IDENT NO.
037Z3
REV
DWG NO.
A
14007
PAGE
4
3.3.8 Testing requirements. The requirement for testing shall be identified by a single letter in accordance with table IV.
TABLE IV. Testing.
Symbol
(blank)
A
Testing requirements
Group A
Group A and Group B
FIGURE 2. Derating curve for high ambient temperatures.
3.4 Marking. Resistors shall be marked with the PIN assigned herein (see
1.2)
and manufacturer's identification code
(CAGE or logo), date code, and lot 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 Recycling, recovered, environmentally preferable or biobased materials. Recycled, recovered, environmentally
preferable or biobased 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 Manufacturer eligibility. To be eligible for listing as an approved source of supply, a manufacturer shall be listed on
the
MIL-PRF-39005
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 DLA Land and Maritime-VAT.
3.7.1 Certificate of compliance. A certificate of compliance shall be required from manufacturers requesting to be an
approved source of supply.
DLA LAND AND MARITIME
COLUMBUS, OHIO
SIZE
CODE IDENT NO.
037Z3
REV
DWG NO.
A
14007
PAGE
5
MicroPython Open Source section
京公网安备 11010802033920号
EEWORLD
