Resistors
Surface Mount Sense Resistors
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Flexible leads for thermal expansion
Open-air design reduces PCB heating
Flexible leads for thermal expansion
Values down to 1m
Open-air design reduces PCB heating
Element TCR 20ppm/C
Values down to 1milliohm
OARS, OARS-XP, OARSZ Series
Zero-ohm 65A jumper version
Element TCR 20ppm/C
RoH S cFolemxipblliealnetads for thermal expansion
Zero-ohm 65A jumper version
Open-air design reduces PCB heating
Values down to 1m
Element TCR 20ppm/C
Electrical Data
Zero-ohm 65A jumper version
RoHS compliant
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
OARS1/3 OARS-XP
watts 2 4
Power rating at 25C
Electrical Data
Power rating at 85C watts 1 2
Electrical Data
Resistance range ohms R002 to R050 R001 to R025
OARS1 OARS3 OARS-XP
Resistance Tolerance % R002: 5, > R002: 1, 5
OARS1/3 OARS-XP
Power rating
Standard Values watts 2 4
Pat o7w0eCr armatbiinengt,a otr 21450CC watts 2 3 5
milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25
(Enquire foterrmuninalislt etedmvpealruaetusr)e
Power rating at 85C watts 1 2
InductanRceesistance range nHohms R002 to R050 R002<1 t0o R015 R001 to R025
Resistance range ohms R002 to R050 R001 to R025
Resistance Tolerance % R002: 5, > R002: 1, 5
Ambient temperature range C -55 to +160
Resistance Tolerance % R002: 5, > R002: 1, 5
2, 3, 4, 5, 10, 15, 20, 1, 2, 2.5, 5, 7.5,
Standard Values
Standard Values
milliohms 2, 3, 4, 5, 10, 15
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) 22, 25, 30, 40, 50
12.5, 10, 20, 25
(Enquire for unlisted values)
OARS-1Z Comments
Inductance nH <10
Inductance nH <10
amps 65
Current rating at 25C
Ambient temperature range C -55 to +160
Ambient temperature range C -55 to +160
amps 46 Zero-ohm jumper
Current rating at 85C
Ambient temperature range C -55 to +160
OARS-1Z Comments
OARS-1Z Comments
Current rating at 25C ambient amps 65
Current rating at 25C amps 65
Physical Data
Max residual resistance milliohms 0.3 Zero-ohm jumper
Zero-ohm jumper
Current rating at 85C amps 46
Ambient temperature range C -55 to +160
Ambient temperature range C -55 to +160
Dimensions (mm) and recommended solder pads
Type
L H T D W a nom. b nom. c nom. d nom.
Physical Data
3.05
OARS1/3 >R003, OARS-1Z
Temperature Derating
Dimensions (mm) and recommendeds0o.7l6der pads
11.18 4.83 3.18
4.07
Type 0.38 0.76 0.38
L H T D W a nom. b nom. c nom. d nom.
OARS1/3 - R003 9.37 3.07
3.513.05
2.36
OARS1/3 >R003, OARS-1Z 3.23
0.76 0.25
0.76
11.5611.18 4.83 3.18
4.7 3.56
4.07
OARS1/3 - R002 4.45
0.38 0.76 0.38
0.38 0.76 0.38
OARS1/3 - R003 9.37 3.07
3.51
2.36
10.7 to 2.28 to
4.83 6.35
3.23
OARS-XP 7.24 9.58 3.18
0.76 0.25
11.56
0.764.7 0.338.56
12.0* 4.57*
OARS1/3 - R002 4.45
0.38 0.76 0.38
* Dependent on ohmic value
10.7 to 2.28 to
4.83 6.35
OARS-XP 7.24 9.58 3.18
12.0* 4.57* 0.76 0.38
* Dependent on ohmic value
OARS1/3/XP
b
c
c
OARSZ d
b
c
c
d
a
a
Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.
General Note
BI Technologies IRC Welwyn
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.
Surface Mount
Sense Resistors
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
OARS, OARS-XP, OARSZ Series
Performance Data (AEC-Q200)
Electrical Data
OARS1 OARS3 OARS-XP
OARS1/3 <R004 R004 to R015 >R015
Power rating
watts 2 3 5
at 70C ambient, or 140C
OARS-XP <R002 R002 to R007 >R007
terminal temperature
Resistance range ohms R002 to R050 R002 to R015 R001 to R025
TCR (-55 to 125C) ppm/C 240 40 40
Resistance Tolerance % R002: 5, > R002: 1, 5
Thermal Shock R% 0.75 0.75 0.75
2, 3, 4, 5, 10, 15, 20, 1, 2, 2.5, 5, 7.5,
Standard Values
milliohms 2, 3, 4, 5, 10, 15
High Temp. Exposure (125C) R% 1.75 0.5 1
(Enquire for unlisted values)
22, 25, 30, 40, 50 12.5, 10, 20, 25
Inductance nH <10
Temp. Cycling (-40 to 125C) R% 1 1 0.75
Ambient temperature range C -55 to +160
Operational Life R% 2 1 1
Biased Humidity R% 0.75 0.5 0.5
OARS-1Z Comments
CurrMenet rcahtinagn ait c2a5lCSamhboienckt amps R% 65 1.5 1 1
Max residual resistance milliohms 0.3 Zero-ohm jumper
Vibration R% 1 1 1
Ambient temperature range C -55 to +160
Terminal Strength Meets JIS-C-6429
Solvent Resistance Meets MIL-STD-002 Method 215
Solderability Meets J-STD-002 Method B
Temperature Derating
Temperature Derating
Pulse Energy Rating
120
120
100
100
80
80
60
OARS1/3/XP
60 40
OARSZ
20
40
0
20
1 10 100
Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.
0
Value (milliohms)
0 25 50 75 100 125 150 175
OARS1/3 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
100
300 Value in milliohms Value in milliohms
OARS1/3 / OARS-XP
OARS1/3 / OARS-XP
250
80
50 / 25 5 / -
200
60
30 / 15 10 / 5
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
BI Technologies IRC Welwyn
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.