OARS-XP-R01JI - WELWYN COMPONENTS

Surface Mount Sense Resistors

OARS, OARS-XP, OARSZ Series

Flexible leads for thermal expansion

 Open-airdesignreducesPCBheang

Values down to 1milliohm

TCR to ±40ppm/°C (Element TCR ±20ppm/°C)

Zero-ohm 65A jumper version

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 25°Cwatts2 4

Power rating at 85ºC watts1 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 25°Camps 65

Current rating at 85°Camps 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

6.01

±0.38 7.24 9.58 3.18

3.23

* Dependent on ohmic value

07.11

Electrical Data

OARS1

OARS3

OARS-XP

Power rating

at 70°C ambient, or 140°C

terminal temperature

watts 2 3 5

Resistance range

ohms

R002 to R050

R002 to R015

R001 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

2, 3, 4, 5, 10, 15

Inductance

<10

Ambient temperature range

°C

-55 to +160

OARS-1Z

Comments

Current rating at 25°C ambient

amps

Zero-ohm jumper

Max residual resistance

milliohms

0.3

Ambient temperature range

°C

-55 to +160

Temperature Derating

OARSZ

OARS1/3/XP

Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.

1, 2, 2.5, 5, 7.5,

12.5, 10, 20, 25

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

OARS1/3 OARS-XP

Power rating at 25ºC watts 2 4

Power rating at 85ºC watts 1 2

Resistance range ohms R002 to R050 R001 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 25ºC amps 65

Current rating at 85ºC amps 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.

OARS1/3 > R003, OARS-1Z 3.05

±0.76

OARS1/3 - R003

11.18

±0.38

4.83

±0.76

3.18

±0.38 4.07

OARS1/3 - R002 11.56

±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

07.11

Resistors

09.18

General Note

TT Electronics reserves the right to make changes in product specication without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)

Surface Mount

Sense Resistors

OARS, OARS-XP, OARSZ Series

Surface Mount Sense Resistors

OARS, OARS-XP, OARSZ Series

Performance Data (AEC-Q200)

OARS1/3 <R004 R004 to R015 >R015

OARS-XP <R002 R002 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% 211

Biased Humidity ∆R% 0.75 0.5 0.5

Mechanical Shock ∆R% 1.5 1 1

Vibration ∆R% 111

Terminal Strength Meets JIS-C-6429

Solvent Resistance Meets MIL-STD-002 Method 215

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 De rating

100

120

0 25 50 75 100 125 150 175

Am bient Tem perature (Deg C)

% of Rated Power

Pulse Energy Rating

100

120

1 10 100

Value (m illiohm s)

Energy (J)

OARS1/3 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

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 illiohms

OARS1/3 / OARS-XP

Joint Temperature Rise

7.6mm x 7.6mm pads, 2 oz copper on FR4, still air

100

25% 50% 75% 100%

Proportion of Rated Power

Temperature Rise (K)

5 / -

10 / 5

30 / 15

50 / 25

Value in milliohms

OARS1/3 / OARS-XP

07.11

Electrical Data

OARS1

OARS3

OARS-XP

Power rating

at 70°C ambient, or 140°C

terminal temperature

watts 2 3 5

Resistance range

ohms

R002 to R050

R002 to R015

R001 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

2, 3, 4, 5, 10, 15

Inductance

<10

Ambient temperature range

°C

-55 to +160

OARS-1Z

Comments

Current rating at 25°C ambient

amps

Zero-ohm jumper

Max residual resistance

milliohms

0.3

Ambient temperature range

°C

-55 to +160

Temperature Derating

OARSZ

OARS1/3/XP

Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating.

1, 2, 2.5, 5, 7.5,

12.5, 10, 20, 25

09.18

General Note

TT Electronics reserves the right to make changes in product specication without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

Thermal Performance Examples

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

2outer 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.

OARS1-R005 at 2W

OARSXP-R0025 at 5W

Surface Mount

Sense Resistors

OARS, OARS-XP, OARSZ Series

09.18

General Note

TT Electronics reserves the right to make changes in product specication without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

Surface Mount Sense Resistors

OARS, OARS-XP, OARSZ Series

Flamm

Construction

ability

The resistor will not burn or emit incandescent particles under any condition of applied temperature or overload.

Marking

The parts are legend marked with

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.

ohmic value and tolerance code.

Packaging Data

Dimensions (mm)

Type A B C D E F G

OARS1/3, OARS-1Z 4.32±0.08 11.7±0.08 8±0.1

OARS-XP-R001 11.94±0.1

OARS-XP >R001 7.21±0.1 11.56±0.1

24±0.3 11.5±0.1 1.75±0.1 12±0.1 4±0.1

07.11

Surface Mount

Sense Resistors

OARS, OARS-XP, OARSZ Series

Standard 4-Terminal Probe Positions for Measuring Unmounted Parts

0.79

6.35

1.27

Ø 0.76

7.94

All dimensions in mm

Standard 4-Terminal Probe Positions for Measuring Unmounted Parts

0.79

6.35

1.27

Ø 0.76

7.94

All dimensions in mm

09.18

General Note

TT Electronics reserves the right to make changes in product specication without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

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)

USA (IRC) Part Numbers: OARS1R010JLF (OARS1, 10 milliohms ±5%, Pb-free)

OARS-1ZLF(OARS-1Z, Pb-free)

Type ValueTolerance Termination & Packing

OARS1

3-5 characters

See Electrical Data

R = ohms

F = ±1%

I = Pb-free, Tape & Reel

OARS3

J = ±5%

OARS1, OARS3

1900/reel

OARS-XP

1200/reel

Type

OARS-1Z

No value or tolerance applies. Termination is Pb-free. Packing is Tape & Reel, 1900/reel.

Type ValueTolerance Termination & Packing

OARS1

4/5 characters

See Electrical Data

R = ohms

F = ±1%

LF = Pb-free

OARS3

J = ±5%

OARS1, OARS3

1900/reel

OARS-XP

1200/reel

Type Termination & Packing

OARS-1Z

No value or tolerance applies.

LF= Pb-free, Tape & Reel, 1900/reel.

Surface Mount

Sense Resistors

OARS, OARS-XP, OARSZ Series

09.18

General Note

TT Electronics reserves the right to make changes in product specication without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn