OAR SERIES
OPEN AIR SENSE RESISTORS
1, 3 & 5 watts
±1% or ±5% tolerance (2% below 5 mOhm)
Resistance wire TCR ±20 ppm/°C
Contact factory for height specifications, application notes and
resistance values below 0.0025 ohms.
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Low inductance versions available for high frequency
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Lead Free ROHS compliant construction available applications.
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Resistive
Element
Copper
Leads
Weld Node
Stand-Off
SPECIFICATIONS:
IRC Type
OAR-1
OAR-3
OAR-5
IRC Power Rating (watts)
1W @ 85°C
3W @ 85°C
5W @ 85°C
Available Resistance (ohms)
0.003 ohms to 0.10 ohms
0.0025 ohms to 0.10 ohms
0.003 ohms to 0.05 ohms
DIMENSIONS
(Inches and (mm)):
On lower ranges stand-off may be
eliminated
NOTE:
Contact factory for:
1. Variations of “A” dimension.
2. Different lead diameter.
Test Point (Kelvin connection)
IRC Type
OAR-1
OAR-3
OAR-5
A
0.450 +0.040/-0.020
(11.43 +1.020/-0.508)
0.600 +0.040/-0.020
(15.24 +1.020/0.508)
0.800 +0.040/-0.020
(20.32 +1.020/-0.508)
B
0.200 ±0.100
(5.08mm ±2.54)
0.600 Typ
(15.3mm max.)
0.350 Typ
(8.9mm max.)
C
0.125 ±0.030
(3.18mm ±0.762)
0.125 ±0.030
(3.18mm ±0.762)
0.125 ±0.030
(3.18mm ±0.762)
E
0.065 +0.010/-0.005
(1.65mm +0.254/-0.127)
0.065 +0.010/-0.005
(1.65mm +0.254/-0.127)
0.065 +0.010/-0.005
(1.65 mm+0.254/-0.127)
F
0.040 ±0.002
(1.02mm ±0.051)
0.040 ±0.002
(1.02mm ±0.051)
0.040 ±0.002
(1.02mm ±0.051)
FEATURES:
• Welded Construction
• Flameproof
• Inductance less than 10
nanohenries
APPLICATIONS:
• Current Sensing
• Feedback
• Low inductance
• Surge and pulse
OPERATING
CHARACTERISTICS:
• Load Life @25°C (1000 hrs):
1% max.
• Moisture No Load (1000 hrs):
1% max.
• Temperature Cycle @ -40°C
& +125°C (1000 cyc): 1% max.
HOW TO ORDER:
Sample Part No.:
OAR-1 0.10 5%
IRC Type
Power (watts)
Resistance Range (ohms)
Tolerance
Lead-Free Construction
LF
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
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road
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Boone, North Carolina 28607-1860
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Tel: 828-264-8861
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Fax: 828-264-8866
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www.irctt.com
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