Surface Mount Sense
Resistors
OARS, OARS-XP, OARSZ Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
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.
© TT electronics plc
11. 11
· Flexible leads for thermal expansion
· Open-air design reduces PCB heating
· Values down to 1m
· Element TCR ±20ppm/ºC
· Zero-ohm 65A jumper version
· RoHS compliant
Surface Mount Sense Resistors
AO RS, OARS-XP, OARSZ Series
Flexible leads for thermal expansion
Open-air design reduces PCB heating
Values down to 1mΩ
Element TCR ±20ppm/ºC
Zero-ohm 65A jumper version
RoHS compliant
Electrical Data
OARS1 OARS-XP
Power rating at 25Cwatts 2 4
Power rating at 85ºC watts 1 2
Resistance range ohms R002 to R050R001 to R025
Resistance Tolerance % ≤R002: 5, > R002: 1, 5
Standard Values
(Enquire for unlisted values) milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25
Inductance nH <10
Ambient temperature range °C -55 to +160
OARS-1Z Comments
Current rating at 25Camps 65
Current rating at 85Camps 46
Ambient temperature range °C -55 to +160
Zero-ohm jumper
Physical Data
Dimensions (mm) and recommended solder pads
Type L H T D W a nom. bnom. cnom. dnom.
OARS1 >R003, OARS-1Z 3.05
±0.76
OARS1-R003
11.18
±0.38
4.83
±0.76
3.18
±0.38 4.07
OARS1-R00211.56
±0.38
3.51
±0.76 4.7
±0.76
3.56
±0.38 4.45
9.37 3.07
OARS-XP 10.7 to
12.0*
2.28 to
4.57*
2.36
±0.25
4.83
±0.76
6.35
±0.38 7.24 9.58 3.18
3.23
* Dependent on ohmic value
a
b
d
c
c
07.11
Surface Mount Sense Resistors
AO RS, OARS-XP, OARSZ Series
Flexible leads for thermal expansion
Open-air design reduces PCB heating
Values down to 1mΩ
Element TCR ±20ppm/ºC
Zero-ohm 65A jumper version
RoHS compliant
Electrical Data
OARS1 OARS-XP
Power rating at 25Cwatts 2 4
Power rating at 85ºC watts 1 2
Resistance range ohms R002 to R050R001 to R025
Resistance Tolerance % ≤R002: 5, > R002: 1, 5
Standard Values
(Enquire for unlisted values) milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25
Inductance nH <10
Ambient temperature range °C -55 to +160
OARS-1Z Comments
Current rating at 25Camps 65
Current rating at 85Camps 46
Ambient temperature range °C -55 to +160
Zero-ohm jumper
Physical Data
Dimensions (mm) and recommended solder pads
Type L H T D W a nom. bnom. cnom. dnom.
OARS1 >R003, OARS-1Z 3.05
±0.76
OARS1-R003
11.18
±0.38
4.83
±0.76
3.18
±0.38 4.07
OARS1-R00211.56
±0.38
3.51
±0.76 4.7
±0.76
3.56
±0.38 4.45
9.37 3.07
OARS-XP 10.7 to
12.0*
2.28 to
4.57*
2.36
±0.25
4.83
±0.76
6.35
±0.38 7.24 9.58 3.18
3.23
* Dependent on ohmic value
a
b
d
c
c
07.11
Surface Mount
Sense Resistors
OARS, OARS-XP, OARSZ Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
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.
© TT electronics plc
11. 11
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Performance Data (AEC-Q200)
OARS1 <R004R004 to R015 >R015
OARS-XP <R002R002 to R007 >R007
TCR (-55 to 125ºC) ppm/ºC 240 40 40
Thermal Shock ∆R% 0.75 0.75 0.75
High Temp. Exposure (125ºC) ∆R% 1.75 0.5 1
Temp. Cycling (-40 to 125ºC) ∆R% 1 1 0.75
Operational Life ∆R% 2 1 1
Biased Humidity ∆R% 0.75 0.5 0.5
Mechanical Shock ∆R% 1.5 1 1
Vibration ∆R% 1 1 1
Terminal Strength Meets JIS-C-6429
Solvent Resistance Meets MIL-STD-002 Method215
Solderability Meets J-STD-002 Method B
Note: Temperature rise data are given here for typical mounting conditions. Actual figures depend on PCB copper weight, mounting pad size, track
width and substrate type. Also, the open air format responds better to forced air cooling than chip format resistors. For values below 5 milliohms
allowance should be made for heat generated in the copper tracks themselves. Application-specific guidance is available on request.
Temperature Derating
0
20
40
60
80
100
120
0 25 50 75 100 125 150 175
Am bient Tem perature (Deg C)
% of Rated Power
Pulse Energy Rating
0
20
40
60
80
100
120
1 10 100
Value (m illiohm s)
Energy (J)
OARS1 OARS-XP
Note: For OARS-1Z the above derating graph may be applied to
the square of the current rating.
Note: This graph relates to single pulses of short duration (≤100ms).
Higher energy limits apply for longer pulses and overloads
Hot Spot Temperature Rise
7.6m m x 7.6m m pads, 2 oz copper on FR4, still air
0
50
100
150
200
250
300
25%50%75% 100%
Proportion of Rated Power
Temperature Rise (K)
50 / 25
30 / 15
10 / 5
5 / -
Value in m illiohm s
OARS1 / OARS-XP
Joint Temperature Rise
7.6mm x 7.6mm pads, 2 oz copper on FR4, still air
0
20
40
60
80
100
25%50%75% 100%
Proportion of Rated Power
Temperature Rise (K)
5/ -
10 / 5
30 / 15
50 / 25
Value in milliohms
OARS1 / OARS-XP
07.11
Surface Mount
Sense Resistors
OARS, OARS-XP, OARSZ Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
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.
© TT electronics plc
11. 11
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Flammability
The resistor will not burn or emit incandescent particles under any condition of applied temperature or overload.
Marking
The parts are legend marked with ohmic value and tolerance code.
Packaging Data
Dimensions (mm)
Type A B C D E F G
OARS1, OARS-1Z 4.32±0.08 11.7±0.08 8±0.1
OARS-XP-R00111.94±0.1
OARS-XP >R0017.21±0.1 11.56±0.1
24±0.3 11.5±0.1 1.75±0.1 12±0.1 4±0.1
Ordering Procedure
Example: OARS1 at 10 milliohms and 5% tolerance on a reel of 1900 pieces -
O A R S 1 – R 0 1 J I
Type
OARS1
OARS-XP
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1%
J 5%
Packing
OARS1 1900/reel
ITape OARS-XP 1200/reel Standard
For the zero-ohm link, order OARS-1Z (Pack quantity is 1900/reel)
07.11
