1、AMSC N/A FSC 5920 INCH-POUND MIL-PRF-23419/12E 17 April 2012 SUPERSEDING MIL-PRF-23419/12D 30 March 2006 PERFORMANCE SPECIFICATION SHEET FUSES, INSTRUMENT TYPE, STYLE FM12 (SUBMINIATURE - HIGH PERFORMANCE) This specification is approved for use by all Departments and Agencies of the Department of De
2、fense. The requirements for acquiring the product described herein shall consist of this specification sheet and MIL-PRF-23419. NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerance is .01 (0.3 mm). FIGURE 1. Style
3、FM12 fuse (.026 inch diameter leads). Inches mm .002 0.05 .010 0.25 .020 0.51 .025 0.64 .026 0.66 .050 1.27 .070 1.78 .145 3.68 .160 4.06 .270 6.86 .280 7.11 1.50 38.1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 2 NOTES: 1. Dime
4、nsions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerance is .01 (0.3 mm). FIGURE 2. Style FM12 fuse (.051 inch diameter leads). Inches mm .002 0.05 .010 0.25 .020 0.51 .032 0.81 .051 1.30 .083 2.11 .100 2.54 .200 5.08 .210 5.33 .380
5、 9.65 .410 10.41 2.00 50.8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 3 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerance is .01 (0.3 mm).
6、 FIGURE 3. Style FM12 fuse (.064 inch diameter leads). Inches mm .002 0.05 .010 0.25 .020 0.51 .032 0.81 .064 1.63 .085 2.16 .100 2.54 .200 5.08 .210 5.33 .380 9.65 .410 10.41 2.00 50.8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12
7、E 4 NOTES: 1. Dimensions are in inches. 2. The figures referenced indicate figure 1, 2, and 3 of the straight lead fuse. 3. “F” option fuses will be supplied with solder coated leads. Solder coating shall extend up the leads to a point between the fuse stand-off and the lead egress point. FIGURE 4.
8、Style FM12 fuse (“F” option formed leads). MIL-PRF-23419/12 A B C D E F G Figure Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. 1 .145 .175 .024 .028 .120 .135 .480 .540 .260 .280 .255 .275 .130 .145 2 .190 .210 .049 .054 .120 .135 .610 .685 .360 .380 .395 .410 .190 .210 3 .19
9、0 .210 .063 .067 .120 .135 .610 .685 .360 .380 .395 .410 .190 .210 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 5 REQUIREMENTS: Interface and physical dimensions: See table I and figures 1, 2, 3, or 4. Case material: Polyphenylen
10、e sulfide (PPS) or equivalent. Internal construction: The fuse element shall be a thick film material printed on a thermally insulated substrate and sealed with a thick film arc suppressive glass. Terminals: Material: CDA-102 Copper. Finish: Gold plate in accordance with SAE-AMS2422 and ASTM B488 (E
11、xception to SAE-AMS2422: The gold underplate shall consist of a minimum of 50 microinches of nickel). The Knoop Hardness range shall be an ASTM code C. Strength: Five pounds applying force axially to each fuse, and one pound of force applying three bends to each terminal. Outgassing: Material shall
12、meet the outgassing requirements specified in MIL-PRF-23419. Current rating: See table I. Voltage rating: See table I. Current carrying capacity: 100 percent at +25C;110 percent at -55C; 80 percent at +125C. Current carrying capacity is independent of vacuum conditions. The temperature of the case o
13、r terminals shall, at no point, rise more than +85C above the ambient air temperature. The maximum temperature rise for 6.0, 7.5, 10, 15, and 20 ampere fuses shall be +120C. Resistance: See table I. Overload interrupt: Interrupt time from -55C through +125C shall be as specified in table I. The foll
14、owing exception shall apply for interrupt times at -55C and 250 percent overload current: a. Fuse ratings of 1.0 ampere and less shall open in 10 seconds maximum. b. Fuse rating greater than 1.0 ampere shall open in 5 seconds maximum. c. Fuse ratings less than 3/8 ampere shall open in 60 seconds max
15、imum. For group B, group C, and qualification inspections, the power supply shall have an open-circuit voltage of not less than that of the specified voltage rating of the fuse under test. Opening times (the interval measured from the application of current to the time the current drops below the ra
16、ting of the fuse) shall be made with an oscillogram for periods shorter than 1 second. Short circuit interrupt: 1,000 amperes at maximum voltage dc. Maximum current clearing I2t: The maximum current clearing I2t shall be in accordance with MIL-PRF-23419 and shall be as specified in table I. Provided
17、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 6 Vibration, high frequency: Fuses shall be tested in accordance with method 204 of MIL-STD-202. The following details and exceptions shall apply: a. Mounting: Fuses shall be mounted with thei
18、r bodies restrained from movement, on an appropriate mounting fixture. b. Test level: Sinusoidal vibration from 5 to 3,000 hertz, 0.4 inch double amplitude or 30 gs peak, whichever is less. (Method 201 of MIL-STD-202 is not applicable). c. Sweep rate: Approximately one-half octave per minute. d. Tes
19、t duration: 12 hours total (4 hours in each of three major axis). e. Loading during testing: Rated dc current on 50 percent of fuse samples tested. f. Measurements: DC resistance measurements shall be taken before and after the vibration exposure. Shock: In accordance with method I of MIL-PRF-23419,
20、 except test condition F. Fuses shall be mounted by their normal mounting means, with their bodies restrained from movement, on an appropriate mounting fixture. Thermal shock: In accordance with MIL-PRF-23419, except test condition B shall apply. Burn-in (168 hours): Fuses shall be mounted by their
21、terminals in sockets. Spacing between each fuse shall not be less than .250 inch (6.35 mm) or greater than 1.00 inch (25.4 mm). Fuses shall be electrically connected to a constant dc source supplying rated current to each fuse. Initial voltage drop measurements shall be taken after current has been
22、applied for a minimum of 2 hours but not longer than 4 hours. Current shall be applied for 168 +4, -0 hours while at room ambient conditions. Forced air shall not flow over the fuses during the burn-in period. The voltage drop of each fuse shall be measured after the burn-in period with the voltage
23、drop change determined from measurements taken before the thermal shock test. The voltage drop change for each fuse shall be less than 10 percent. Terminal strength: Method 211 of MIL-STD-202, test condition A (5 pounds pull) applying the force axially to each wire individually, then test condition
24、C (1 pound force) applying three bends to each wire terminal. The DC resistance of each fuse shall be measured before and after testing in accordance with MIL-PRF-23419. The change in resistance shall not exceed 10 percent from the initial value. Resistance to soldering heat: Method 210 of MIL-STD-2
25、02, test condition B. Depth of immersion to be between .020 and .050 inch (0.51 and 1.27 mm) from the base for the fuse case. The DC resistance of each fuse shall be measured before and after testing in accordance with MIL-PRF-23419. The change in resistance shall not exceed 10 percent from the init
26、ial value. The formation of solder balls in the lead egress area shall not be considered reason for rejection. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 7 Low temperature operation: Fuses shall be mounted by their terminals in
27、 sockets and placed in a low temperature chamber. The chamber temperature shall be lowered gradually to -55C +0C, -3C within a period of 1 hour. After stabilizing at the low temperature for 1 hour, rated dc current shall be applied to the fuses for a period of 4 +1, -0 hours while at the low tempera
28、ture. The chamber shall then be gradually raised to room temperature over a 4 hour period and maintained at room temperature for a period of 8 hours minimum. After this time, the dc current shall be removed from the fuses and the fuses removed from the chamber. The DC resistance of each fuse shall b
29、e measured before and after testing in accordance with MIL-PRF-23419. The change in resistance shall not exceed 10 percent from the initial value. Life (2,000 hours): Fuses shall be mounted by their terminals in sockets and mounted in a chamber at +125C +3C, -0C ambient. The fuses shall be electrica
30、lly connected to a dc source supplying each fuse with 64 percent of the +25C rated value of current. The fuses shall remain in the chamber at specified current for 2,000 8 hours. The electrical circuit shall provide a suitable indicator, which shall be monitored daily during the length of the life t
31、est, to identify failure (blowing) of any fuse. The time of failure shall be recorded to the nearest 12 hours and the blown fuse replaced with a short circuit for the remainder of the test. The DC resistance of each fuse shall be measured before and after testing as specified in MIL-PRF-23419 and sh
32、all not have changed by more than 10 percent. Solderability: Fuses shall be tested in accordance with method 208 of MIL-STD-202. Gold plated leads shall have the gold removed by single or double dipping into a flowing or nonflowing hot solder of sufficient volume to assure complete gold removal. Moi
33、sture resistance: Fuses shall be tested as specified in MIL-PRF-23419. The DC resistance of each fuse shall be measured before and after testing and shall not have changed by more than 15 percent. Dielectric withstanding voltage: Fuses shall be tested in accordance with method 301 of MIL-STD-202. Fu
34、ses shall be mounted in a test fixture capable of exposing all major surfaces of the fuse body and the leads to the test voltage. The test voltage shall be applied to the terminals electrically tied together and to the test fixture. The following details shall apply: a. Test voltage: 500 V rms. b. D
35、uration: 5 seconds for group A inspections. 60 seconds for qualification inspections. c. Leakage current: 1 milliampere maximum. d. Measurements: DC resistance of the fuse after the dielectric withstanding exposure in accordance with MIL-PRF-23419. This test shall become part of the group I test und
36、er qualification and group A inspections. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 8 Thermal vacuum: Fuses shall be mounted in suitable mount sockets. The fuses shall then be placed in a vacuum chamber and the chamber evacuat
37、ed to a pressure of 5 x 10-5torr maximum. The temperature of the fuse mount shall be controlled such that the temperature of the fuses, as measured with a thermocouple mounted on the fuse body, is maintained at +125C 3C for a period of 48 +4, -0 hours, while 90 percent of the 25C rated current is fl
38、owing through each fuse. At the end of the 48 hour exposure and while the fuses are at the test temperature and pressure, one-half of the samples shall be given an overload interrupt test at 400 percent of their rated current. The fuses shall then be removed from the chamber and the remaining fuses
39、(not blown) measured for DC resistance as specified in MIL-PRF-23419. The change in resistance shall not exceed 10 percent of the initial value. Quality conformance: With the exception of the overload characterization test and dielectric withstanding voltage test, the following tests shall be conduc
40、ted on 100 percent of the units, in the order shown, and shall replace the group A tests referenced in MIL-PRF-23419. Nonconforming units shall be removed from the lot. The lot shall be considered rejected if it exceeds the allowable PDA of 5 percent for the thermal shock and burn-in tests combined.
41、 a. Precap inspection performed at 10X magnification as specified herein. b. Visual and mechanical inspection; screen for the following defects: (1) Cracks in the plastic molded housing (critical at lead egress area). (2) Insufficient plastic fill (critical at lead egress area). (3) Excessive plasti
42、c flash (part out of dimensional tolerance). c. Thermal shock as specified herein. d. Burn-in: 168 hours at rated current and ambient air at +25C +3C, -0C. e. DC resistance in accordance with MIL-PRF-23419. f. Overload characterization: Each fuse lot shall be sampled to assure that overload interrup
43、t times shall fall within the limits as specified in table I. Each lot shall be truncated to form an inspection lot based upon the final voltage drop as measured after the completion of burn-in. The manufacturer shall subject samples selected from the extremes of the truncated population to overload
44、 interrupt testing to ensure that overload interrupt times are as specified in table I. A minimum of 20 fuses shall be selected from the extremes of the population and subjected to 250 percent, 400 percent, and 600 percent overload interrupt testing. g. Radiographic inspection in accordance with met
45、hod 209, MIL-STD-202, two views (0 and 90). Inspection criteria shall be as specified herein. h. Visual and mechanical inspection in accordance with MIL-PRF-23419 at 10X magnification. i. Dielectric withstanding voltage shall be performed as specified herein. A sample of fuses shall be randomly sele
46、cted in accordance with the zero defect sampling plan of MIL-PRF-23419 (group B column). If one or more defects are found, the lot shall be rejected. Part or Identifying Number (PIN): The PIN shall be derived from table I. An example of a complete PIN designation: FM12A72V1/2A. Provided by IHSNot fo
47、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23419/12E 9 Marking: Fuses shall be marked with the PIN designation in accordance with MIL-PRF-23419, manufacturers name or logo, date code, and serialized label. Manufacturers lot may be marked optionally. Marking
48、ink color shall be white. Current derating limits: The recommended derating limits for fuses covered in this specification sheet are listed on figure 4 below. This figure relates current to case temperature, regardless of vacuum conditions. Precap inspection: Prior to molding, all fuses shall be vis
49、ually inspected at 10X magnification for the following defects: a. Obvious foreign inclusions or pits greater than .005 inch (0.13 mm) diameter in the arc suppressant glass shall be cause for rejection if they fall within the dashed line as indicated on figure 5. b. Parts shall be visually free of flux or other foreign materia
