scope:

This specification covers the associated requirements for style RNC90, nonestablished reliability, established reliability, and space level, fixed, film, resistors. 1/

The PIN 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 nonestablished reliability, established reliability, or space level, 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 C32, or C52 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: US Army Communications - Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LEO-E-EP, Fort Monmouth, NJ 07703-5023, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

Style RNC90 is available in characteristic Y and characteristic Z. Characteristic Y and characteristic Z are 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. 300 volts maximum working voltage. Z - 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. 100 volts maximum working voltage.

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 tolerance D and resistance tolerance F. The resistance values for tolerance V, tolerance T, tolerance A, and tolerance 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 inclusive 1 to 9.88 ohms inclusive 10R000 to 98R800 inclusive 10 to 98.8 ohms inclusive 100R00 to 988R00 inclusive 100 to 988 ohms inclusive 1K0000 to 9K8800 inclusive 1 to 9.88 kilohms inclusive 10K000 to 98K800 inclusive 10 to 98.8 kilohms inclusive 100K00 to 988K00 inclusive 100 to 988 kilohms inclusive 1M0000 to 9M8800 inclusive 1 to 9.88 megohms inclusive

The resistance tolerance is identified by a single letter in 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 product level designator applicable to this specification shall be symbol C, symbol M, symbol P, symbol R, symbol S, and symbol T.