MIL-R-10509J
3.3 Material. The material shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the resistors to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product.
3.4 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified (see 3.1).
3.4.1 Terminals. All terminals shall be treated to facilitate soldering.
3.4.2 Solder dip (retinning) leads. Only the manufacturer or his authorized MIL-PRF-55182 category B or category C distributor who has previously been approved, may solder dip/retin the leads of product supplied to this specification (see appendix A) provided the solder dip/retin process has been approved
by the qualifying activity.
* 3.4.3 Pure tin. The use of pure tin, as an underplate or final finish is prohibited both internally and externally. Tin content of resistors components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.4).
3.5 Power rating. The resistors shall have a power rating based on continuous full load operation at an ambient temperature of 70°C for characteristic D, and characteristic G, and 125°C for characteristic C, characteristic E, and characteristic F (see 3.1). This power rating is dependent on the ability of resistors
to meet the life requirements specified in 3.18. For temperatures in excess of those specified above, the
load shall be derated in accordance with figure 1.
NOTE: These curves indicate the percentage of nominal wattage to be applied at temperature higher than 70°C and 125°C. However, at no time shall the applied voltage exceed the maximum
for each style (see table I).
FIGURE 1. Derating curves for high ambient temperatures.
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