RWS7 & RWS10
Precision Power
Wirewound SMD Resistors
This product has been uniquely designed to meet the rising power requirement
for surface mount components. Optimised thermal design is targeted to give
greater efficiency and improved surge capacity of up to 5 times for 5 seconds,
whilst reducing surface temperature rise compared with other resistors.
It has high reliability and has been engineered to reduce long term thermal
damage to boards and surrounding components. Available in low inductance
format, close TCR and tolerance bands. This product is RoHS compliant.
•
Highest power SMD commercially available
•
Optimised thermal design
•
Excellent overload characteristics
•
Very high power density for SMD
•
Good stability and low standard TCR
•
Low inductance available
Electrical Specifications
Type
RWS7
RWS10
Wattage
7
10
Tolerance
D (0.5%)
F (1%)
J (5%)
Resistance Range
Min
R1
R1
Max
5K
10K
Resistance Range
Non-inductive
Min
R1
R1
Max
1K
2K
Characteristics
Operating temperature:
Temperature coefficient:
Max. working voltage:
Short time overload:
Solderability:
Life:
-55°C to +275°C
± 90ppm/°C R1 - R99, ± 50ppm/°C 1R - 10R, ± 20ppm/°C > 10R
(PxR)
1/2
5 times rated power for 5 seconds, ±(0.5% + 0.5mΩ) ∆R
Bath temperature 260±5˚C, immersion time 5±0.5 seconds JIS C 5201 4.18, > 90% of contact face
covered new solder
Test temperature at 70˚C ±2˚C, rated DC continuous working voltage applied, 1.5 hours on and 0.5
hours off for 1000 hours, ±(2.0% +0.5mΩ)∆R
Ordering Procedure
Standard Resistor: Series, Resistance Value, Tolerance,
Packaging (T&R or Bulk)
e.g. RWS7 R005 F T&R
ARCOL UK Limited,
Threemilestone Ind. Estate,
Truro, Cornwall, TR4 9LG, UK.
T +44 (0) 1872 277431
F +44 (0) 1872 222002
E sales@arcolresistors.com
The information contained herein does not form part of
a contract and is subject to change without notice. Arcol
operate a policy of continual product development, therefore,
specifications may change.
It is the responsibility of the customer to ensure that the
component selected from our range is suitable for the intended
application. If in doubt please ask Arcol.
Page 1 of 2
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www.arcolresistors.com
RWS7 & RWS10
SMD Precision
Power Wirewound Resistor
Temperature Rise
175
150
Derating Curve
120
100
Temperature (°
C)
125
100
75
50
25
0
7W
Power (Watt)
10W
Rated Power (%)
80
60
40
20
0
-65
25
75
125
175
225
275
Temperature (°C)
Dimensions (mm
±0.38)
Type
RWS7
RWS10
L
1
20.5
28.60
L
2
1.50
2.54
W
1
9.30
12.00
H
1
10.30
13.00
W
2
8.97
11.54
Solder Pad Dimensions
Type
RWS7
RWS10
W2
L3
W3
L
3
5.70
14.00
L
4
22.50
30.60
W
3
11.30
14.00
L2
H1
L1
W1
L4
Soldering Recommendation
°C
Ramp-up
Pre-heating
Reflow
Peak 260°C max, 20 sec
Cooling
250
200
150
180°C max, 120 sec max
Keep at
220°C
max, 60
sec max
Ramp-down 6°C/sec max
100
50
0
Ramp-up 3°C/sec max
50
100
150
200
250
300
Sec
ARCOL UK Limited,
Threemilestone Ind. Estate,
Truro, Cornwall, TR4 9LG, UK.
T +44 (0) 1872 277431
F +44 (0) 1872 222002
E sales@arcolresistors.com
The information contained herein does not form part of
a contract and is subject to change without notice. Arcol
operate a policy of continual product development, therefore,
specifications may change.
It is the responsibility of the customer to ensure that the
component selected from our range is suitable for the intended
application. If in doubt please ask Arcol.
Page 2 of 2
1/12.41
www.arcolresistors.com
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