MIL-PRF-83530C
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between requirements of this specification and the
specification sheet, the latter shall govern (see 6.2).
3.2 Qualification. Resistors furnished under this specification shall be products which are qualified for listing on the
3.3 Materials. Materials 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.
3.3.1 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 6.4).
3.4 Interface and physical dimension requirements. Resistors shall meet the interface and physical dimension
requirements as specified (see 3.1).
3.4.1 Terminal leads. Terminal leads shall be made of a solid conductor of the length and diameter specified.
(see 3.1). They shall be treated to meet the requirements of solderability. (see 3.14). When a tin lead solder coating
is used, the tin content shall be between 40 and 70 percent.
3.4.1.1 Solder dip (retinning) of leads. The manufacturer may solder dip/retin the leads of product supplied to this
specification provided the solder dip/retin process (see appendix A) has been approved by the qualifying activity.
3.4.2 Solder Flux. When soldering fluxes are required during manufacturing processes, noncorrosive fluxes shall
be used.
3.5 Voltage rating. Resistors shall have a rated direct-current (dc) continuous operating voltage, or a rated sine-
wave root-mean-square (rms) alternating-current (ac) continuous operating voltage at commercial-line frequency and
waveform as specified (See 3.1). This voltage is dependent on the ability of resistors to meet the operating life
requirements specified in 3.28.
3.6 Power rating. Resistors shall have transient average power dissipation ratings (see 3.1) based on a group of
pulses occurring within a specified isolated time period. This rating is based on the ability of resistors to meet the
pulse life requirements specified in 3.11.
E = √PR
Where:
E = Continuous rated dc or rms working voltage in volts.
P = Rated power in watts.
R = Nominal resistance in ohms.
3.7 Nominal voltage. When resistors are tested as specified in 4.8.2, the dc voltage shall not exceed the specified
tolerance of the nominal voltage (see 3.1).
3.8 Clamping voltage. When tested as specified in 4.8.3, the clamping voltage shall not exceed the specified
maximum value (see 3.1).
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