General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
RN Series
• 1/8 watt to 1/2 watt
• 10 ohms to 1M ohms
• 0.1% to 1% tolerance
• MIL-R-10509 ±25 ppm/°C to ±100
Precision Mil-Qualified
Metal Glaze™ Resistor
Electrical Data
MIL Type Marking Tolerance
(±%)
T.C.
(ppm/°C)
Power Rating
(watts)
Resistance
Range
(ohms)
Nominal
Size
Max Voltage
Rating
RN50C* Stamp 1 50 1/20 @ 125°C 10 to 100K 1/8W 200
RN55D Stamp 1 100 1/8 @ 70°C 10 to 301M 1/4W 200
RN55C Stamp 0.1, 0.5, 1 50 1/10 @ 125°C 49.9 to 100M 1/4W 200
RN55E Stamp 0.1, 0.5, 1 25 1/10 @ 125°C 49.9 to 100M 1/4W 200
RN60D Stamp 1 100 1/4 @ 70°C 10 to 1M 1/2W 300
RN60C Stamp 0.1, 0.5, 1 50 1/8 @ 125°C 49.9 to 499K 1/2W 250
RN60E Stamp 0.1, 0.5, 1 25 1/8 @ 125°C 49.9 to 499K 1/2W 250
* Conformally coated construction on all 1/8 nominal sizes.
Test Conditions
MIL-R-10509 Test
Limits Allowed
RN55 Max.
%∆R (±3σ)
RN55 (D) RN55 (C) T0-55 T2-55
Temperature Coefficient (ppm/°C) +200/-500 ±50 ±100 ±50
Low Temperature Operation ±0.50% ±0.25% ±0.10% ±0.10%
Temperature Cycling ±0.50% ±0.25% ±0.10% ±0.10%
Moisture Resistance ±1.50% ±0.50% ±0.50% ±0.50%
Short Time Overload ±0.50% ±0.25% ±0.10% ±0.10%
Load Life (70°C-1/2W, 125°C-1/100W) 1000 hours ±1.00% ±0.50% ±0.30% ±0.20%
Terminal Strength ±0.20% ±0.20% ±0.05% ±0.05%
Effect of Soldering ±0.50% ±0.10% ±0.10% ±0.10%
Shock ±0.50% ±0.25% ±0.05% ±0.05%
Vibration ±0.50% ±0.25% ±0.05% ±0.05%
High Temperature Exposure (150°C No Load) N/A N/A ±0.50% ±0.50%
2X Rated Power for 10,000 hours @ 70°C N/A N/A ±0.50% ±0.50%
Temperature Rise @ 1/4W Power Load - - See Temperature Rise Chart
Dielectric Strength ±0.50% ±0.25% ±0.05% ±0.05%
Environmental Data
Tough molded jacket
Metal Glaze thick film
element fired at 1000°C to
solid ceramic core
Tin-lead electroplated copper leads
Spiraled or laser
helixed to
resistance value,
tolerance
High temperature
soldered termination-lead
assembly
Digital marking per
MIL-R-10509
RN Series Issue November 2008 Sheet 1 of 2
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Dimensions (Inches and (mm))
Nominal
Size
Body Length
BL
Body Diameter
BD
Lead Length
LL
Lead Diameter
LD Clean Lead
1/8 watt 0.150 ±0.020
(3.8 ±0.5)
0.066 ±0.008
(1.7 ±0.2)
1.00 ±0.125
(25.4 ±3.2)
0.016 ±0.002
(0.41 ±0.05)
0.225
(5.7)
1/4 watt 0.250 ±0.015
(6.4 ±0.4)
0.090 ±0.008
(2.3 ±0.2)
1.50 ±0.125
(38.1 ±3.2)
0.025 ±0.002
(0.64 ±0.05)
0.310
(7.9)
1/2 watt 0.390 ±0.010
(9.9 ±0.3)
0.140 ±0.008
(3.6 ±0.2)
1.50 ±0.125
(38.1 ±3.2)
0.025 ±0.002
(0.64 ±0.05)
0.450
(11.4)
Physical Data
LL
LD
BL
BD
Sample Part No.
MIL Style
RL = Fixed Film Resistor
High stability
Power Rating
50 = 1/20 watt
55 = 1/10 watt
60 = 1/8 watt
T.C. Characteristics
D = ±100ppm/°C
C = ±50ppm/°C
E = ±25ppm/°C
Resistance
First three digits represent significant figures;
fourth digit is number of zeros.
Tolerance
F = ±1%, D = ±0.5%, B = ±0.1%
Ordering Data
RN 55 D 1002 F
100
80
60
0
0 125 150 175
Ambient Temperature (°C)
RN55D, 60D
40
20
165
MIL Spec. Power Derating Chart
% Of MIL Spec. Rated Power
Precision Mil-Qualified
Metal Glaze™ Resistor
RN55C, 60C
& 50C, RN55E,
60E
RN Series Issue November 2008 Sheet 2 of 2
