Resistors
Surface Mount Sense Resistors
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Values down to 1mΩ
Element TCR ±20ppm/ºC
Electrical
Zero-ohm 65A jumper version
Data
RoHS compliant
Power rating at 25ºC
Electrical Data
Power rating at 85ºC
Electrical Data
Resistance range
Resistance Tolerance
Power rating
Standard
70°C ambient,
at 25ºC
Power rating
or 140°C
at
Values
(Enquire for unlisted values)
85ºC
terminal
rating at
Power
temperature
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Flexible leads for thermal expansion
Open-air design
for thermal expansion
Flexible leads
reduces PCB heating
Values down to 1mΩ
Open-air design reduces PCB heating
Element TCR ±20ppm/ºC
Values
OARS-XP, OARSZ Series
OARS,
down to 1milliohm
Zero-ohm 65A jumper version
Element TCR
RoHS compliant
±20ppm/°C
Flexible leads for thermal expansion
Zero-ohm 65A jumper version
PCB heating
Open-air design reduces
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
OARS1/3
OARS-XP
watts
watts
ohms
%
nH
ohms
ohms
°C
%
%
watts
watts
2
2
milliohms
watts
3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50
3
2,
2
4
1
2
R002 to R050
R001 to R025
OARS1
OARS3
OARS-XP
≤
R002: 5, > R002: 1, 5
OARS1/3
OARS-XP
Inductance
Resistance
range
Resistance
range
Ambient
Resistance Tolerance
temperature range
Resistance Tolerance
(Enquire for unlisted
values)
(Enquire for unlisted
values)
Standard
Values
Standard
Values
milliohms
milliohms
amps
nH
Current
Inductance
rating at 25ºC
temperature range
amps
°C
Current
Ambient
85ºC
rating at
Ambient temperature range
°C
Current
rating at 25ºC
Current
rating
at 25°C ambient
Physical Data
resistance
Max residual
1
2
<10
R002 to
R002 to R050
R050
R002 to R015
R001 to R025
R001 to R025
≤
R002:
to +160
1, 5
-55
5, > R002:
≤
R002:
5, > R002:
1, 5
2, 3, 4, 5, 10, 15, 20,
1, 2, 2.5, 5, 7.5,
2,
40,
5,
2,
22, 25, 30, 40, 50
22, 25, 30,
3, 4,
50
10, 15
1, 2, 2.5, 5, 7.5,
10, 20, 25
3, 4, 5, 10, 15, 20,
12.5,
10, 20, 25
OARS-1Z
Comments
<10
<10
65
-55 to +160
-55 to +160
Zero-ohm jumper
46
4
5
1, 2, 2.5, 5, 7.5, 10, 20, 25
-55 to +160
amps
milliohms
amps
Current rating at 85ºC
Ambient temperature range
°C
Ambient temperature range
°C
Dimensions (mm) and recommended solder pads
OARS-1Z
OARS-1Z
65
65
46
0.3
-55 to
-55 to +160
+160
Comments
Comments
Zero-ohm jumper
Zero-ohm jumper
Type
3.05
OARS1/3 > R003, OARS-1Z
Temperature Derating
±
0.76
Dimensions (mm) and recommended solder pads
11.18
OARS1/3 - R003
Type
±0.38
Physical Data
L
H
T
T
D
±0.76
D
W
±0.38
W
a
nom.
b
nom.
c
nom.
d
nom.
4.07
3.51
3.05
2.36
OARS1/3 > R003, OARS-1Z
4.83
11.56
11.18
±
0.76
±
0.76
±0.25
4.7
OARS1/3 - R002
±0.38
±0.76
±0.76
±
0.38
OARS1/3 - R003
3.51
2.36
4.83
10.7 to
2.28 to
OARS-XP
±0.25
4.7
±0.76
12.0*
11.56
4.57*
±
0.76
OARS1/3 - R002
* Dependent on ohmic value
L
H
4.83
3.18
a
nom.
b
nom.
c
nom.
d
nom.
9.37
3.07
3.07
±0.38
±0.38
3.18
3.56
4.07
4.45
3.23
3.23
OARS-XP
* Dependent on ohmic value
±
0.38
10.7 to
12.0*
±0.76
±0.76
3.56
±0.38
±0.38
±0.38
6.35
9.37
7.24
4.45
7.24
9.58
9.58
3.18
3.18
2.28 to
4.57*
4.83
6.35
OARS1/3/XP
OARSZ
a
a
c
c
b
d
b
d
c
c
Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
07.11
07.11
11.16
Surface Mount
Sense Resistors
Sense Resistors
Surface Mount
OARS, OARS-XP, OARSZ Series
OARS, OARS-XP, OARSZ Series
Performance
Electrical Data
Power rating
Data (AEC-Q200)
OARS1
OARS3
OARS-XP
OARS1/3
<R004
R004 to R015
watts
2
3
5
at 70°C ambient, or 140°C
OARS-XP
<R002
R002 to R007
terminal temperature
Resistance
(-55 to 125ºC)
ohms
R002 to R050
R002 to
240
R015
R001 to R025
40
TCR
range
ppm/ºC
Resistance Tolerance
%
≤
R002: 5, > R002: 1, 5
Thermal Shock
∆R%
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 (125ºC)
22, 25, 30, 40, 50
∆R%
1.75
(Enquire for unlisted values)
12.5, 10, 20, 25
0.5
Inductance
Cycling (-40 to 125ºC)
nH
<10
1
Temp.
∆R%
1
Ambient temperature
Life
range
°C
-55 to +160
Operational
∆R%
2
1
Biased Humidity
∆R%
0.75
OARS-1Z
Comments
0.5
Current rating
at 25°C
Shock
amps
Mechanical
ambient
∆R%
65
1.5
1
Max residual resistance
milliohms
0.3
Zero-ohm jumper
Vibration
∆R%
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
Tem perature Derating
120
% of Rated Power
>R015
>R007
40
0.75
1
0.75
1
0.5
1
1
Pulse Energy Rating
120
100
80
60
40
20
0
1
10
Value (m illiohm s)
OARS1/3
OARS-XP
100
80
60
40
20
0
25
50
75
100
OARSZ
OARS1/3/XP
Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.
0
125
150
175
Am bient Tem perature (Deg C)
Note: For OARS-1Z the above derating graph may be applied to
the square of the current rating.
Energy (J)
100
Note: This graph relates to single pulses of short duration (≤ 100ms).
Higher energy limits apply for longer pulses and overloads
7.6m m x 7.6m m pads, 2 oz copper on FR4, still air
Hot Spot Temperature Rise
7.6mm x 7.6mm pads, 2 oz copper on FR4, still air
Value in m illiohm s
OARS1/3 / OARS-XP
Joint Temperature Rise
250
200
150
100
50
0
25%
50%
75%
Temperature Rise (K)
Temperature Rise (K)
300
100
80
60
40
20
0
25%
50%
75%
Value in milliohms
OARS1/3 / OARS-XP
50 / 25
30 / 15
10 / 5
5/-
5/-
10 / 5
30 / 15
50 / 25
100%
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.
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
07.11
© TT Electronics plc
11.16
Surface Mount
Sense Resistors
OARS, OARS-XP, OARSZ Series
Thermal Performance Examples
OARS1-R005 at 2W
OARSXP-R0025 at 5W
These thermal images were taken under ambient conditions of still air at 25°C with the components
mounted on horizontal standard test boards as defined below.
JEDEC standard circuit board:
2” (50.8mm) square FR4
2 outer power planes, 2 ounce (70μ) Cu
1” (25.4mm) square exposed
2 inner signal planes, 1 ounce (35μ) Cu
(continuous planes)
In contrast to the flat chip format, the OARS format keeps the hot spot thermally distant from the
solder j oints and reduces undesirable heat delivery into the PCB. Further thermal images for other
ohmic values and power dissipations are available on request.
Kelvin (4 Terminal) Mounting
For high precision applications a Kelvin (4
Terminal) mounting method is
recommended. An example to illustrate the
design principle is shown. High current
connections are made to the two pairs of
larger pads, whilst the voltage sense
connections are made to the two smaller
central pads.
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
11.16
Surface Mount
Sense Resistors
OARS, OARS-XP, OARSZ Series
Standard 4-Terminal Probe Positions for Measuring Unmounted Parts
Standard 4-Terminal Probe Positions for Measuring Unmounted Parts
0.79
6.35
0.79
6.35
Ø 0.76
Ø 0.76
1.27
Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
7.94
7.94
All dimensions in mm
All dimensions in mm
1.27
Construction
Copper terminations are welded to resistance alloy strip which is then formed. Value adjustment is achieved
by control of width, without the need for subsequent abrasion or notch trimming.
Pb-free termination finish is 96% Sn / 4% Ag alloy.
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
OARS1/3, OARS-1Z
OARS-XP-R001
OARS-XP >R001
4.32±0.08
7.21±0.1
A
11.7±0.08
11.94±0.1
11.56±0.1
B
C
24±0.3
D
11.5±0.1
E
1.75±0.1
8±0.1
12±0.1
F
G
4±0.1
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
11.16
Surface Mount
Sense Resistors
OARS, OARS-XP, OARSZ Series
Ordering Procedure
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Numbers:
OARS1-R01JI
(OARS1, 10 milliohms ±5%, Pb-free)
OARS-1Z
(OARS-1Z, Pb-free)
-
R
0
2
1
J
3
I
4
4
Termination & Packing
I = Pb-free, Tape & Reel
OARS1, OARS3 1900/reel
OARS-XP
1200/reel
O
A
R
S
1
1
1
Type
2
Value
3
Tolerance
F = ±1%
J = ±5%
OARS1
3-5 characters
OARS3 See Electrical Data
R = ohms
OARS-XP
O
A
R
S
1
1
Type
-
1
Z
OARS-1Z No value or tolerance applies. Termination is Pb-free. Packing is Tape & Reel, 1900/reel.
USA (IRC) Part Numbers:
OARS1R010JLF
(OARS1, 10 milliohms ±5%, Pb-free)
OARS-1ZLF
(OARS-1Z, Pb-free)
R
0
2
2
3
Tolerance
F = ±1%
J = ±5%
1
0
J
3
L
4
4
Termination & Packing
LF = Pb-free
OARS1, OARS3 1900/reel
OARS-XP
1200/reel
F
O
A
R
S
1
1
1
Type
Value
OARS1
4/5 characters
OARS3 See Electrical Data
R = ohms
OARS-XP
O
A
R
S
1
1
Type
OARS-1Z
-
1
Z
L
F
2
2
Termination & Packing
No value or tolerance applies. LF= Pb-free, Tape & Reel, 1900/reel.
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
11.16
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