OARS Datasheet, PDF (2/3 Pages) Welwyn Components Limited – Surface Mount Sense Resistors

Surface Mount Sense Resistors
OARS, OARS-XP, OARSZ Series
Performance Data (AEC-Q200)
TCR (-55 to 125ºC)
Thermal Shock
High Temp. Exposure (125ºC)
Temp. Cycling (-40 to 125ºC)
Operational Life
Biased Humidity
Mechanical Shock
Vibration
Terminal Strength
Solvent Resistance
Solderability
OARS1
OARS-XP
ppm/ºC
∆ R%
∆ R%
∆ R%
∆ R%
∆ R%
∆ R%
∆ R%
Tem perature Derating
<R004
<R002
240
0.75
1.75
1
2
0.75
1.5
1
R004 to R015
R002 to R007
40
0.75
0.5
1
1
0.5
1
1
Meets JIS-C-6429
Meets MIL-STD-002 Method 215
Meets J-STD-002 Method B
>R015
>R007
40
0.75
1
0.75
1
0.5
1
1
Pulse Energy Rating
120
100
80
60
40
20
0
0 25 50 75 100 125 150 175
Am bient Tem perature (Deg C)
Note: For OARS-1Z the above derating graph may be applied to
the square of the current rating.
120
100
80
60
40
20
0
1
10
100
Value (m illiohm s)
OARS1
OARS-XP
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
Joint Temperature Rise
7.6mm x 7.6mm pads, 2 oz copper on FR4, still air
300
250
200
150
100
50
0
25%
50%
75%
Proportion of Rated Power
Value in m illiohm s
OARS1 / OARS-XP
50 / 25
30 / 15
10 / 5
5/ -
100%
100
80
60
40
20
0
25%
50%
75%
Proportion of Rated Power
Value in milliohms
OARS1 / OARS-XP
5/ -
10 / 5
30 / 15
50 / 25
100%
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.
Issue F .09.07