Mold Military-Qualified Precision Resistors (RN)

Military-qualified resistive precision resistors meet most demanding specifications.

Direct (RN) series can be specified for all ultra precision electronics designs, as well as a complete selection of MIL-PRF-55182 and GJB244A-2001 quality standards.

Production is strictly controlled and follows an extensive set of instructions established for reproducibility. A homogeneous film of metal alloy is deposited on a high grade ceramic body and conditioned to achieve the desired temperature stability.

Nickel plated steel terminations are firmly pressed on the metallised rods. A special laser is used to achieve the target value by smoothly cutting in the resistive layer without damaging the ceramics. A further conditioning is applied in order to stabilise the trimming result.

After a helical groove has been cut in the resistive layer, tinned connecting wires of electrolytic copper are welded to the end-caps. The resistors are moulded into cylinder shape which provides electrical, mechanical, and climatic protection.

Products equate Vishay, Ohmite, Caddock, IRC, EBG, Panasonic Precision Devices with more competitive price and fast delivery. Commercial alternatives to military styles are available with higher power ratings. Detailed high precision (RN) specifications, both mechanical and electrical, can be download here (RN) Series PDF 331KB, or contact our sales representative for more information.

Production Standard :
Which is made referencing to Chinese National Quality Standard GJB244A-2001 standards, and USA Military/Established Reliability MIL-PRF-55182 in environmental and dimensional requirements.

Power Rating :
Power ratings are based on the following two conditions,
  1. ± 2.0 % maximum ΔR in 10 000 h load life.
  2. + 175 °C maximum operating temperature.
Applications :
  1. Industrial process control systems,
  2. Measuring and calibration equipment,
  3. Telecom, Precision Instruments, Avionics,
  4. Test and measurement, Medical electronics.
Features :
  1. Very low noise.
  2. Precision tight tolerances to B (±0.10%).
  3. Military/Established Reliability and stability.
  4. Wide resistance ranges from 10Ω to 5MΩ.
  5. Controlled temperature coefficient to E ( ±25 ppm/°C).
  6. Covers all general type precision resistive products.
  7. Lead (Pb)-free and RoHS compliant.
Dimensions & Technical Characteristics (RN)
Mold Type (RN) Dimensions
Mold Type (RN) Dimensions
(RN) Power Derating Curve
(RN) Power Derating Curve
TYPE RN55 RN60 RN65 RN70
Rated Wattage (W) 70°C 0.125 (1/8W) 0.25 (1/4W) 0.5 (1/2W) 1W
125°C 0.1 0.125 0.25 0.5
Max. Working Voltage (V) 200 250 300 350
Dimensions (Unit: mm) L ± 0.3 6.8 10.0 15.1 18.4
D ± 0.4 2.5 3.8 5.2 6.5
A ± 0.05 0.60 0.60 0.60 0.80
MIL-Approved Resistance Range (Ω) 10Ω ~ 3MΩ 10Ω ~ 3MΩ 10Ω ~ 3MΩ 10Ω ~ 5MΩ
AWG Wire No. 22 22 22 20
Working Temperature Range -55°C ~ +175°C
Nominal Resistance Tolerance B(±0.10%), C(±0.25% ), D(±0.50%), F(±1.00%)
Temperature Coefficient C3(±25PPM/°C), C2(±50PPM/°C), C1(±100PPM/°C)
1. Temperature Coefficient PPM can be low to ±5PPM/°C, if applications only need operation in narrow precise
    temperature range within -55°C ~ +175°C. Please contact Direct Representatives.
2. Please contact Direct's Representatives if your requirement is not in above range.
Mechanical and Electrical Test Conditions (RN)
Type Item Method Requirement
Long Period Life Time GJB244A (MIL-PRF-55182) 4.8.18
Rated Wattage,125°C,2000h,10000h
GJB244A (MIL-PRF-55182) 3.24
Humidity GJB244A (MIL-PRF-55182) 4.8.18
-10°C ~ +65°C, RH<90%
Rated Wattage, Cycle 240h.
GJB244A (MIL-PRF-55182) 3.21
High Temp. Exposed GJB244A 4.8.19
175°C 2000h
GJB244A (MIL-PRF-55182) 3.25
Short Period Dielectric Voltage GJB244A (MIL-PRF-55182)
GJB244A (MIL-PRF-55182) 3.18/3.29/3.16
no physical damage, arc,
isolation break through
Lead Strength,
High Frequency Vibration
GJB244A (MIL-PRF-55182)
GJB244A (MIL-PRF-55182) 3.17/3.22/3.23
no physical damage
Solderability GJB244A (MIL-PRF-55182) 4.8.14 GJB244A (MIL-PRF-55182) 3.20
no physical damage
Order Codes (RN)
RN65 0.5W 10R D C2 P
Part Number
Rated Power
RN55 70°C 0.125W
RN60 0.25W
RN65 0.5W
RN70 0.75W
RN55 125°C 0.1W
RN60 0.125W
RN65 0.25W
RN70 0.5W
Resistance Value
10R 10Ω
100R 100Ω
1K1 1.1KΩ
11K 11KΩ
110K 110KΩ
1M 1MΩ
Resistance Tolerance
B ±0.10%
C ±0.25%
D ±0.50%
F ±1.00%
Temperature coefficient
C1 ±100ppm/°C
C2 ±50ppm/°C
C3 ±25ppm/°C
P Bulk