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Columbus, ATTN: DSCC VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or by email Resistor@dla.mil
.
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.
AMSC N/A FSC 5905
INCH-POUND
MIL-PRF-26H
15 September2006
SUPERSEDING
MIL-PRF-26G
14 June 2001
PERFORMANCE SPECIFICATION
RESISTORS, FIXED, WIRE WOUND (POWER TYPE)
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope
. This specification covers the general requirements for power type, wire-wound, fixed resistors for use
in electrical, communications, and associated equipment. Included are general purpose styles of 5 percent initial
resistance tolerance, with power ratings ranging from 3 watts to 240 watts at 25
O
C, derated to 0 power at 350
O
C
(characteristics N and V) and precision axial lead types of .1(B) percent, .5 (D) percent, and 1 (F) percent initial
resistance tolerances with power ratings ranging from 1 watt to 10 watts at 25
O
C, derated to 0 power at 250
O
C
(characteristic U).
1.2 Classification
.
1.2.1 Part or Identifying Number (PIN)
. The PIN is in the following form (see 3.1):
RW80
V
49R9
F
⏐
⏐ ⏐
⏐
Style
(1.2.1.1)
Characteristic
(1.2.1.2)
Resistance
(1.2.1.3)
Resistance
Tolerance
(1.2.1.4)
1.2.1.1 Style
. The style is identified by the two-letter symbol "RW" followed by a two-digit number; the letters
identify power type, wire-wound, fixed resistors, and the number identifies the size, wattage rating, and construction
of the resistors (see 3.1).
1.2.1.2 Characteristic
. The characteristic is identified by a single letter that identifies the maximum continuous
operating temperature (surface hot spot), the high ambient temperature derating (see 3.1), the minimum insulation
resistance value, and the degree of moisture resistance in accordance with the applicable associated specification
(see 3.1).
1.2.1.3 Resistance. The nominal resistance expressed in ohms is identified by a three-digit number; the first two
digits represent significant figures and the last digit specifies the number of zeroes to follow. When resistance values
less than 10 ohms 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 as shown in the
following example.
R10 = 0.1 ohm
1R0 = 1.0 ohm
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