OAR_D.qxd 8/9/04 4:15 PM Page 1
OAR_D.qxd 8/9/04 4:15 PM Page 1
Open Air
Open Air
Open Air
Welwyn Components
Sense Resistors
Sense Resistors
Welwyn Components
Sense Resistors
OAR Series
OAR Series
OAR Series
1, 3 and 5 watts
1, 3 and 5 watts
1, 3 and 5 watts
1% or 5% tolerance1% or 5% tolerance
Resistance wire TCR 20 ppm/C
1% or 5% tolerance
Resistance wire TCR 20 ppm/C
Resistance values down to 0R005 ohms
Resistance wire TCR 20 ppm/C
Resistance values down to 0R005 ohms
Resistance values down to 0R005 ohms
Electrical Data
Electrical Data
OAR-1 OAR-3 OAR-5
Power rating at 85C watts 1 3 5
OAR-1 OAR-3 OAR-5
Resistance range ohms 0R005* to 0.10 0R005 to 0.10 0R005 to 0.05
Power rating at 85C watts 1 3 5
* Contact factory for values below 0R005 ohms
Resistance range ohms 0R005* to 0.10 0R005 to 0.10 0R005 to 0.05
* Contact factory for values below 0R005 ohms
Physical Data
Physical Data
Dimensions (mm)
Type A B C E F
Dimensions (mm)
OAR-1 11.43 +1.020/-0.508 5.08 2.54 3.18 0.762 1.65 +0.254/-0.127 1.02 0.051
Type A B C E F
OAR-3 15.24 +1.020/-0.50 25.4 max. 3.18 0.762 1.65 +0.254/0.127 1.02 0.051
OAR-1 11.43 +1.020/-0.508 5.08 2.54 3.18 0.762 1.65 +0.254/-0.127 1.02 0.051
OAR-5 20.32 +1.020/-0.50 25.4 max. 3.18 0.762 1.65 +0.254/-0.127 1.02 0.051
OAR-3 15.24 +1.020/-0.50 25.4 max. 3.18 0.762 1.65 +0.254/0.127 1.02 0.051
OAR-5 20.32 +1.020/-0.50 25.4 max. 3.18 0.762 1.65 +0.254/-0.127 1.02 0.051
On lower ranges stand-off may be eliminated
On lower ranges stand-off may be eliminated
B
NOTE:
Contact factory for:
B
NOTE:
1.Variations of A dimension
C
Contact factory for:
2.Different lead diameter
1.Variations of A dimension
C
2.Different lead diameter
A
F
Test Point (Kelvin connection)
A
F
Test Point (Kelvin connection)
E
E
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
General Note
General All Noteinformation is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of
TT electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Components reserves the right to make changes in product specification without notice or liability. TT electronics plc
All information Welwyn is subject Components to Welwyns own Limiteddata and is Bedlington, considered Northumberland accurate at time NE22 of going 7AA, to UKprint. A subsidiary of
All information is subject to TT electronics own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com TT electronics Issue plcD 08.04
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
TT electronics plc
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com Issue D 08.04
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101OAR_D.qxd 8/9/04 4:15 PM Page 2
Open Air
Open Air
Sense Resistors
Sense Resistors
OAR Series
Welwyn Components
OAR Series
Height Standards
All Resistances are in ohms. All Tolerances are 2.54. Dimensions (mm)
OAR-1
Resistance 0.005 - 0.100
Height 5.080
OAR-3
Resistance 0.005 0.010 0.015 0.020 0.025 0.030 0.040 0.050 0.070 0.080 0.10
Height 16.002 16.510 16.510 17.018 22.098 22.860 16.002 18.288 22.860 21.590 22.860
OAR-5
Resistance 0.005 0.010 0.015 0.020 0.025
Height 15.240 19.304 19.304 22.860 22.860
Performance Data
Maximum change
Load life: 1000 hrs at 25C R% 1
Moisture No Load 100 hrs R% 1
Temperature Cycle at -40C & +125C (1000 cyc): R% 1
Features
Welded Construction
Flameproof
Inductance less than 10 nanohenries
Solderable copper leads
Applications
Current Sensing
Feedback
Low inductance
Surge and pulse
Ordering Procedure
Example: OAR3 at 10 milliohms and 5% tolerance in bulk pack -
O A R 3 R 0 1 J I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1%
J 5%
Packing
I Bulk Standard
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
All information is subject to TT electronics own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com Issue D 08.04
TT electronics plc
102
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