Surface Mount Sense
Surface Mount Sense Resistors
Resistors
OARS, OARS-XP, OARSZ Series
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Flexible leads for thermal expansion
Flexible leads for thermal expansion
Open-air design reduces PCB heating
Open-air design reduces PCB heating
Values down to 1m
Values down to 1m
OARS, OARS-XP, OARSZ Series
Element TCR 20ppm/C
Element TCR 20ppm/C
Flexible leads for thermal expansion
Zero-o hmZer6o-ohm 65A jumper version5A jumper version
Open-air design reduces PCB heating
RoHS compliant
RoHS compliant
Values down to 1m
Element TCR 20ppm/C
Zero-ohm 65A jumper version
RoHS compliant
Electrical Data
OARS1 OARS-XP
Power rating at 25C watts 2 4
Electrical Data
Power rating at 85C watts 1 2
OARS1 OARS-XP
Resistance range ohms R002 to R050 R001 to R025
watts 2 4
Power rating at 25C
Resistance Tolerance % R002: 5, > R002: 1, 5
Power rating at 85C watts 1 2
Standard Values
milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25
Resistance range ohms R002 to R050 R001 to R025
(Enquire for unlisted values)
Inductance Resistance Tolerance nH % R0<0120: 5, > R002: 1, 5
Standard Values
Ambient temperature range C -55 to +160
milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25
(Enquire for unlisted values)
Inductance nH <10
OARS-1Z Comments
Ambient temperature range C -55 to +160
Current rating at 25C amps 65
Zero-ohm jumper
Current rating at 85C amps 46
OARS-1Z Comments
Ambient temperature range C -55 to +160
Current rating at 25C amps 65
Zero-ohm jumper
Current rating at 85C amps 46
Physical Data
Ambient temperature range C -55 to +160
Dimensions (mm) and recommended solder pads
Physical Data
Type L H T D W a nom. b nom. c nom. d nom.
Dimensions (mm) and recommended solder pads
3.05
OARS1 >R003, OARS-1Z
Type L H T D W a nom. b nom. c nom. d nom.
0.76
11.18 4.83 3.18
4.07
3.05
0.38 0.76 0.38
OARS1 >R003, OARS-1Z
OARS1-R003 0.76 9.37 3.07
11.18 4.83 3.18
3.51
2.36 4.07
3.23
0.38 0.76 0.38
0.76 0.25
OARS1-R003 9.37 3.07
11.56
4.7 3.56
3.51
OARS1-R002 2.36
4.45
3.23
0.38 0.76 0.38
0.76 0.25
11.56
4.7 3.56
OARS1-R002 4.45
10.7 to 2.28 to
4.83 6.35
0.38 0.76 0.38
OARS-XP 7.24 9.58 3.18
12.0* 4.57* 0.76 0.38
10.7 to 2.28 to
4.83 6.35
OARS-XP 7.24 9.58 3.18
* Dependent on ohmic value
12.0* 4.57* 0.76 0.38
* Dependent on ohmic value
b
c b c
d
c
c
d
a
a
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
TT electronics plc
07.11
07.11
11. 11Surface Mount
Sense Resistors
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
OARS, OARS-XP, OARSZ Series
Performance Data (AEC-Q200)
OARS1 <R004 R004 to R015 >R015
OARS-XP <R002 R002 to R007 >R007
TCR (-55 to 125C) ppm/C 240 40 40
Thermal Shock R% 0.75 0.75 0.75
High Temp. Exposure (125C) R% 1.75 0.5 1
Temp. Cycling (-40 to 125C) 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 Method 215
Solderability Meets J-STD-002 Method B
Temperature Derating
Pulse Energy Rating
120
120
100
100
80
80
60
40
60
20
40
0
20
1 10 100
0
Value (milliohms)
0 25 50 75 100 125 150 175
OARS1 OARS-XP
Ambient Temperature (Deg C)
Note: For OARS-1Z the above derating graph may be applied to
Note: This graph relates to single pulses of short duration ( 100ms).
the square of the current rating.
Higher energy limits apply for longer pulses and overloads
Joint Temperature Rise
Hot Spot Temperature Rise
7.6mm x 7.6mm pads, 2 oz copper on FR4, still air
7.6mm x 7.6mm pads, 2 oz copper on FR4, still air
300 100 Value in milliohms
Value in milliohms
OARS1 / OARS-XP OARS1 / OARS-XP
250
80
50 / 25 5 / -
200
60
10 / 5
30 / 15
150
10 / 5 30 / 15
40
100
5 / - 50 / 25
20
50
0
0
25% 50% 75% 100%
25% 50% 75% 100%
Proportion of Rated Power Proportion of Rated Power
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.
07.11
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
TT electronics plc
11. 11
% of Rated Power
Temperature Rise (K)
Temperature Rise (K)
Energy (J)