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 Resistance Range Resistance Range Non-inductive Type Wattage Tolerance Min Max Min Max D (0.5%) RWS7 7 R1 5K R1 1K F (1%) RWS10 10 R1 10K R1 2K J (5%) Characteristics Operating temperature: -55C to +275C Temperature coefficient: 90ppm/C R1 - R99, 50ppm/C 1R - 10R, 20ppm/C > 10R 1/2 Max. working voltage: (PxR) Short time overload: 5 times rated power for 5 seconds, (0.5% + 0.5m) R Solderability: Bath temperature 2605C, immersion time 50.5 seconds JIS C 5201 4.18, > 90% of contact face covered new solder Life: Test temperature at 70C 2C, rated DC continuous working voltage applied, 1.5 hours on and 0.5 hours off for 1000 hours, (2.0% +0.5m)R Ordering Procedure Standard Resistor: Series, Resistance Value, Tolerance, Packaging (T&R or Bulk) e.g. RWS7 R005 F T&R ARCOL UK Limited, The information contained herein does not form part of Threemilestone Ind. Estate, a contract and is subject to change without notice. Arcol Truro, Cornwall, TR4 9LG, UK. operate a policy of continual product development, therefore, T +44 (0) 1872 277431 specifications may change. F +44 (0) 1872 222002 It is the responsibility of the customer to ensure that the E sales arcolresistors.com component selected from our range is suitable for the intended www.arcolresistors.com application. If in doubt please ask Arcol. Page 1 of 2 1/12.41RWS7 & RWS10 SMD Precision Power Wirewound Resistor Temperature Rise Derating Curve 175 120 150 100 125 80 60 100 40 75 20 50 0 25 -65 25 75 125 175 225 275 0 7W 10W Temperature (C) Power (Watt) Dimensions (mm 0.38) Solder Pad Dimensions Type L L W H W 1 2 1 1 2 Type L L W 3 4 3 RWS7 20.5 1.50 9.30 10.30 8.97 RWS7 5.70 22.50 11.30 RWS10 28.60 2.54 12.00 13.00 11.54 RWS10 14.00 30.60 14.00 W2 L2 L3 W3 H1 L1 L4 W1 Soldering Recommendation C Ramp-up Pre-heating Reflow Cooling Peak 260C max, 20 sec 250 200 Keep at 220C max, 60 sec max 150 Ramp-down 6C/sec max 180C max, 120 sec max 100 50 Ramp-up 3C/sec max 0 50 100 150 200 250 300 Sec ARCOL UK Limited, The information contained herein does not form part of Threemilestone Ind. Estate, a contract and is subject to change without notice. Arcol Truro, Cornwall, TR4 9LG, UK. operate a policy of continual product development, therefore, T +44 (0) 1872 277431 specifications may change. F +44 (0) 1872 222002 It is the responsibility of the customer to ensure that the E sales arcolresistors.com component selected from our range is suitable for the intended www.arcolresistors.com application. If in doubt please ask Arcol. Page 2 of 2 1/12.41 Temperature (C) Rated Power (%)
