TOKEN BWW Precision Wirewound Resistors Precision Moulded Wirewound Resistors (BWW) Precision Wirewound Power Resistors Operate in Harsh Environments Preview The new BWW series moulded axial leaded wirewound resistors from Token use high-purity alumina ceramic cores with wire winding which are spot welded by precision CNC machine tools to ensure total operational consistency throughout. Also, using advanced encapsulation die/mould technologies, this precision power resistors are encapsulated with epoxy molding compound. The BWW models possess a wide resistance value from 0.1Ω to 39KΩ and meets the stringent requirements of MIL-R-93. Ayrton Perry noninductive windings are available on request. The BWW precision version has low ohmic values for current sensing applications. All versions are miniaturised for better power to dimension ratios and are available in 0.5W to 10W rated power at 25°C. Tolerance is available in ±0.1%, ±0.25%, ±0.5%, ±1% and ±2% with TCR ±25PPM/°C, ±50PPM/°C and ±150PPM/°C which makes them ideally suited for use in precision applications. The BWW series is RoHS compliant with 100% Sn (lead free) coated terminals. To address your need for technical and economic success in a timely manner, our custom solutions are the best option. Contact us with your specific needs. Features - Axial Moulded - Excellent load life stability - Insulation, Moisture Proof - High Precision and reliability - Meets the Standards of MIL-R-93 - RoHS compliant with 100% lead free Applications - Electrical loads, Filament dropping - DC/DC converters, AC/DC inverters - High-voltage bleeders, Dynamic braking - Capacitor charging/discharging regulation - Motor speed controls, Voltage divider networks - Bias supply, Current shunts, Voltage dropping, Crow-bar circuits Version 2010 http://www.token.com.tw/ rfq token.com.tw 01 of 03 TOKEN BWW Precision Wirewound Resistors Technical Specifcations -55 100 A 85 30±3 B Rated Power % Power Derating Curve 80 58.5 40 d F (check point) 20 0 -80 -60 -40 -20 0 20 40 60 80 100 120 140 160 175 200 Ambient Temp. °C Type RateWatts at 25°C (W) BWW-0.5 BWW-1 BWW-3 BWW-4 BWW-5 BWW-10 0.5 1.0 3.0 4.0 5.0 10.0 Resistance Range (Ω) Min Max 0.1 100 0.1 1K 0.1 10K 0.1 15K 1 24K 1 39K Tolerance TCR (%) (PPM/°C) ±0.1 ±0.25 ±0.5 ±1 ±2 ±25 ±50 ±150 Dimensions (mm) A±0.25 7.0 11.0 15.0 18.0 24.0 46.5 ΦB±0.25 3.0 3.0 5.2 6.5 8.4 10.0 Φd 0.8 0.8 0.8 0.8 1.0 1.0 F 27.0 31.0 34.0 38.0 44.0 66.0 Performance Test Items Operating Temp. Range Insulation Resistance Dielectric Withstanding Voltage Load Life Moisture-Proof Load Life Resistance to soldering heat Solderability 02 of 03 Test Conditions 500V 500V AC 1 Min. 70°C on~off cycle 1000 Hrs. 40°C 95% RH on~off cycle 21 Hrs. 350°C, 3.5s 235±5°C, 5s(solder bath method) http://www.token.com.tw/ Specifications -55°C ~ 175°C >1GΩ ΔR ≤ ±0.1%R ΔR ≤ ±1%R ΔR ≤ ±0.2%R ΔR ≤ ±0.1%R IEC68-2-20(1968) rfq token.com.tw Version 2010 TOKEN BWW Precision Wirewound Resistors Application Notes Precision Wire-wound Resistors Application Notes: ● When being used in AC circuits, some wirewound structures give inductance ingredients or parasitic capacity, so they may cause unusual phenomena such as oscillations etc. Quorum deviations of other components should be carefully taken into account for use. ● Application and Placement: Wire wound resistors use different gauges of wire as resistance elements. Sometimes the gauge is extremely thin (finer than a strand of human hair) and very susceptible to breakage in environments containing salts, ash, dust and corrosives. Avoid utilization in such environments. ● Do not install in dusty areas because the accumulation will cause shorts and poor conductance. How to Order BWW 1W 100R F D P Part Number: BWW Rated Power (W) Resistance Value (Ω) Code TCR (PPM/°C) Resistance Value (Ω) OR1 100R 1K Code C D K 0.1 Ω 100Ω 1000Ω Resistance Tolerance (%) Code B C D F G TCR ±25PPM/°C ±50PPM/°C ±150PPM/°C Package Resistance Tolerance ±0.1% ±0.25% ±0.5% ±1% ±2% Code P Package Bulk Back to 1st Page - Precision Wirewound Resistors (BWW) Version 2010 http://www.token.com.tw/ rfq token.com.tw 03 of 03