scope:

This specification covers the detail requirements for style RNC90 1/, established reliability, fixed, film, resistors.

The type designation shall be in the following form:

Style and terminal type is identified by a three-letter symbol as indicated in table I and a two digit number. The letters identify established reliability, fixed, film, resistors of a specified terminal type and the number "90" identifies the size and configuration of the resistor applicable to this specification. TABLE I. Style and terminal type.

Symbol Terminal RNC Solderable/weldable (type C31, C32, or C51 of MIL-STD-1276) RNN 1/ Weldable (type N-2 of MIL-STD-1276) 1/ Type N terminals are not available for resistance values less than 500 ohms (see 6.3).

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to Army Laboratory Command, ATTN: SLCET-R-S, Fort Monmouth, New Jersey 07703-5000, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

Style RNC90 is available in characteristic Y only. Characteristic Y is identified as follows:

Y - Nonhermetically sealed - Resistance temperature characteristic (referenced to +25°C) = ±5 ppm/°C up to and including +125°C and ±10 ppm/°C from +125°C to +175°C.

The nominal resistance expressed in ohms is identified by six characters, consisting of five digits and a letter. The letter is used simultaneously as a decimal point and as a multiplier. For resistance values:

a. Greater than or equal to 1 ohm but less than 1,000 ohms, the letter "R" is used to represent a decimal point.

b. Greater than or equal to 1,000 ohms but less than 1 megohm, the letter "K" is used to represent a decimal point.

c. Greater than or equal to 1 megohm, the letter "M" is used to represent a decimal point.

All digits preceding and following the letter (R, K, or M) of the group represent significant figures. The resistance value designations are shown in table II. Minimum and maximum resistance values shall be as specified herein. The standard values for every decade shall follow the sequence specified in table IV of MIL-R-55182 for resistance tolerances D and F. The resistance values for tolerances V, T, A, and B may be any value within the limits specified in 3.3, but it is preferred that values be chosen from the "B" and "D" column of table IV of MIL-R-55182. TABLE II. Designation of resistance values.

Designation Resistance 1R0000 to 9R8800 incl 1 to 9.88 ohms incl 10R000 to 98R800 incl 10 to 98.8 ohms incl 100R00 to 988R00 incl 100 to 988 ohms incl 1K0000 to 9K8800 incl 1 to 9.88 kilohms incl 10K000 to 98K800 incl 10 to 98.8 kilohms incl 100K00 to 988K00 incl 100 to 988 kilohms incl 1M0000 to 9M8800 incl 1 to 9.88 megohms incl

The resistance tolerance is identified by a single letter accordance with table III. TABLE III. Resistance tolerance.

Symbol Resistance tolerance Percent V ±0.005 T ±0.01 A ±0.05 B ±0.1 D ±0.5 F ±1.0

The life failure-rate applicable to this specification shall be symbols M, P, R, and S.