Resistors
Resistors
Open Air Resistor
Open Air Resistor
Metal Element Current Sense
OAR
Metal Element Current Sense
Open Air Resistor
OAR & OAR-TP Series
Metal Element Current Sense
OAR & OAR-TP Series
Power ratings of 1, 3, & 5W @ 85C
Superior surge performance
Power ratings of 1, 3, & 5W @ 85C
TCRs to 20ppm/C
Hot sp ot isolated from PCB material
Superior surge performance
Power ratings of 1, 3, & 5W @ 85C
Resistance wire TCR 20pp m/C
Hot sp ot isolated from PCB material
Resistance range from 2.5m to 100m
Tolerances to 1%
Resistance wire TCR 20pp m/C
Open air design maximizes thermal performance
Tolerances to 1%
Welded copper leads minimize effects from solder wicking and provide
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
true 1% performance
AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3)
Electrical Data
Power Rating
Part Resistance Tolerance Wire TCR Inductance
@ 85C
Number Range (m) (%) (ppm/C) (nH)
(watts)
3, 5, 6, 8, 10, 12, 15, 20, 25, 30, 35,
OAR-1 (TP) 1.0
40, 50, 60, 70, 80, 100
2, 2.5, 3, 4, 5, 6, 7, 10, 15, 20, 25,
OAR-3 (TP) 3.0 1, 2, 5 20 <10
30, 40, 45, 50, 60, 70, 100
3, 4, 5, 6, 6.2, 10, 12, 15,
OAR-5 (TP) 5.0
20, 25, 30, 40, 50
Notes:
2% tolerance available <5m
Please contact factory for resistance values not listed
Environmental Data
Load Life (1000 hours @ 25C) R/R <1%
Moisture (no load for 1000 hours) R/R <1%
Temperature Cycling (-40C to +125C for 1000 cycles) R/R <1%
Operating Temperature -40C to +125C
General Note
BI Technologies IRC Welwyn
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
IRC reserves the right to make changes in product speci cation without notice or liability.
All information is subject to IRCs own data and is considered accurate at time of going to print.
General Note
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
A subsidiary of
BI Technologies IRC Welwyn
OAR
Open Air Resistor
Open Air Resistor
Open Air Resistor
Metal Element Current Sense
Metal Element Current Sense
Metal Element Current Sense
OAR & OAR-TP Series
OAR & OAR-TP Series
OAR
Open Air Resistor
Physical Data
Physical Data
Metal Element Current Sense On lower ranges stand-off may be
eliminated
NOTE:
B
Contact factory for:
1. Variations of A dimension.
Physical Data
C
2. Different lead diameter.
E
On lower ranges stand-off may be
eliminated
F
Test Point (Kelvin connection)
A
NOTE:
B
Contact factory for:
Type A B max C E F
1. Variations of A dimension.
Dimensions (Inches and (mm))
C
2. Different lead diameter.
0.45 +0.04/-0.02
IROCAR1 Type A B0.32 (8.12) C E E F
(11.43 +1.02/-0.51 )
F
0.450 +0.040/-0.020 0.27 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
Test Point (Kelvin connection)
0.197 +0.04/-0.03 A
OAR-1
OAR1TP 0.45 (11.4)
(11.43 +1.020/-0.508) 0.32 (8.12) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
(5.0 +1.0/-0.8 )
0.600 +0.040/-0.020 0.65 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
0.60 +0.04/-0.02
Dimensions (Inches and (mm))
OOAR-3AR3 0.92 (23.4)
(15.24 +1.02/-0.51 )
(15.24 +1.020/0.508) 0.92 (23.4) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
IRC Type A B C 0.125 0.03 0.065E +0.01/-0.005 F0.04 0.002
OAR3TP 0.275 +0.04/-0.03
0.800 +0.040/-0.020 0.65 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
(3.18 0.76) (1.65 +0.25/-0.13 ) (1.02 0.05)
OAR-5
<R005 0.450 +0.040/-0.020(7.0 +1.0/-0.8 ) 0.27 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
OAR-1 (20.32 +1.020/-0.508) 0.88 (22.4) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
1.12 (28.5)
(11.43 +1.020/-0.508) 0.32 (8.12) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
OAR3TP 0.197 +0.04/-0.03
R005 (5.0 +1.0/-0.8 )
0.600 +0.040/-0.020 0.65 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
OAR-3
0.80 +0.04/-0.02
(15.24 +1.020/0.508) 0.92 (23.4) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
Thermal Image Data
OAR5 0.88 (22.4)
(20.32 +1.02/-0.51 )
0.800 +0.040/-0.020 0.65 Typ 0.125 0.030 0.065 +0.010/-0.005 0.040 0.002
OAR-5 0.275 +0.04/-0.03
OAR5TP 1.14 (29)
(20.32 +1.020/-0.508) 0.88 (22.4) max (3.18 0.762) (1.65 +0.254/-0.127) (1.02 0.051)
(7.0 +1.0/-0.8 )
Thermal Image Data
OAR-1 5 m @ 1 Watt OAR-3 5 m @ 3 Watt OAR-5 5 m @ 5 Watt
Hot Spot: 87C Hot Spot: 160C Hot Spot: 230C
Solder Joint: 45C Solder Joint: 70C Solder Joint: 96C
The thermal images (not simulations) above are of the OAR products at their respective power rating. Notice the
solder joint temperature is much lower than the hotspot. The unique construction of the OAR isolates the tempera-
ture of the hotspot from the circuit board material preventing damage to the circuit board. OAR-1 5 m @ 1 Watt OAR-3 5 m @ 3 Watt OAR-5 5 m Additionall @ 5 Wy, the thermal att
energy is dissipated to the air instead of being conducted into the circuit board potentially causing a nearby power
Hot Spot: 87C Hot Spot: 160C Hot Spot: 230C
component to exceed its rating.
Solder Joint: 45C Solder Joint: 70C Solder Joint: 96C
The thermal images (not simulations) above are of the OAR products at their respective power rating. Notice the
The standard test circuit board consists of a four layer FR4 material with 2 ounce (70m) outer layers and 1 ounce
solder joint temperature is much lower than the hotspot. The unique construction of the OAR isolates the tempera-
(35m) inner layers, which is typical of many industry designs. The test conditions were in ambient temperature
ture of the hotspot from the circuit board material preventing damage to the circuit board. Additionally, the thermal
conditions, approximately 22 C with no forced air. Contact TT electronics for more details or for other thermal image
energy is dissipated to the air instead of being conducted into the circuit board potentially causing a nearby power
test data for specific resistance values and power levels.
component to exceed its rating.
Wire and Film Technologies Division 4222 South Staples Street Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 Facsimile: 361 992 3377 Website: www.irctt.com OAR Series Issue June 2011 Sheet 2 of 3
The standard test circuit board consists of a four layer FR4 material with 2 ounce (70m) outer layers and 1 ounce
(35m) inner layers, which is typical of many industry designs. The test conditions were in ambient temperature
conditions, approximately 22 C with no forced air. Contact TT electronics for more details or for other thermal image
test data for specific resistance values and power levels.
Wire and Film Technologies Division 4222 South Staples Street Corpus Christi Texas 78411 USA
General Note
Telephone: 361 992 7900 Facsimile: 361 992 3377 Website: www.irctt.com OAR Series Issue June 2011 Sheet 2 of 3
General Note
BI Technologies IRC Welwyn
BI Technologies IRC Welwyn
TT Electronics reserves the right to make changes in product specification without notice or liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors