Resistors General-Purpose Failsafe General-Purpose Failsafe Welwyn Components Moulded Wirewound Resistors Moulded Wirewound Resistors SP20 / SP20F Series SP20/SP20F Series SP20F UL1412 recognised fusing * Drop-in replacement for BW20/BW20F 0.1 ohm to 1200 ohms Predictable fusing characteristics F version has flame resistant coating 1 watt rated with 1/2 wa tt d imensions 1 watt rated with 1/2 watt dimensions Drop- in replacement BW20 / BW20F 0.1 ohm to 1200 ohms Weldable and solderable magnetic lead Weldable and solderable magnetic leads TCRs as low as 150 ppm/C standard (custom TC s available) Lead free, RoHS compliant construction available * UL file number E234469 AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data Type SP20 SP20F EIA RS-344 Style CRU 1 MIL-R-11 Style RC20/RC32 Resistance Range ohms 0R1 to 1k2 0R1 to 1k UL Recognised Range ohms N/A 4R7 to 470R Tolerance % 5, 10 Power rating watts 1 at 50C 1 at 50C 0.75 at 70C 0.75 at 70C 0.5 at 100C - Derating to 0 at 160C Derating to 0 at 160C Maximum continuous working voltage PR Minimum insulation resistance dry 10,000 Meg wet 100 Meg Minimum dielectric withstanding volts ATM 700V Reduced pressure RMS 450V Hotspot temperature rise 120C at 1 watt Current noise Negligible Physical Data Dimensions (mm) Type L D d f d SP20 9.910.25 3.560.20 0.8130.05 38.13.2 D L f SP20F 9.910.25 3.560.20 0.8130.05 38.13.2 Resistive Element Encapsulation All resistor types have resistance alloy winding on a braided The SP20 and SP20F are encapsulated utilizing a compression fibreglass substrate. Intermediate silicone coatings are used to molded phenolic plastic material. The SP20F has a flame enhance processibility and to provide protection to the resistance coating applied over the resistive element to resistive element. provide flammmability protection when destructive overloads may occur. Termination The SP20 and SP20F resistors are terminated using an alloy Marking coated copper flashed steel lead welded to a cap of the same All products are marked utilizing heat and solvent resistant material. This termination assembly is mechanically crimped, colour code bands consistent with EIA/MIL requirements. The utilizing an improved crimp design, to the resistive element. first band is double width to designate wirewound construction. A fifth band, blue in colour, is used for flameproof identification. GenerGeneralal Not Notee BI Technologies IRC Welwyn Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. All information is subject to TT Electronics own data and is considered accurate at time of going to print. TT electronics plc www.ttelectronics.com/resistors Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 09.18 95General-Purpose Failsafe General-Purpose Failsafe General-PurposeGeneral-Purpose FailsafFailsafee Moulded WirMoulded Wireewwound Round Resisesisttororss Make Possible MouldedMoulded WWiirrewoundewound ResistorResistorss SP20/SP20F SeriesSP20/SP20F Series WWelwynelwyn ComponentsComponents SP20/SP20FSP20/SP20F SerieSeriess Performance Data Performance Data Test SP20 SP20F Test SP20 SP20F Temperature coefficient (ppm) ppm/C <1R 800 <1R 800* Temperature coefficient (ppm) ppm/C <1R 800 <1R 800* 1R 150 1R 150 1R 150 1R 150 Dielectric withstanding voltage RMS 700V Dielectric withstanding voltage RMS 700V Momentary overload % 5 Momentary overload % 5 Low temperature operation % 5 Low temperature operation % 5 Temperature cycle % 5 Temperature cycle % 5 Humidity % 5 SP20 / SP20F Series Humidity % 5 Load life % 5 Load life % 5 General Purpose Failsafe Terminal strength % 5 Terminal strength % 5 MoldedResistance to so ldWirer heatewound Resistor % 5 Resistance to solder heat % 5 *0.1 ohm SP20F <1000 ppm. *0.1 ohm SP20F <1000 ppm. SP20 Power Derating SP20F Power Derating SP20 Power Derating SP20F Power Derating SP-20 Power Derating Curve SP-20F Power Derating Curve 2.5 2.5 2.5 2.5 2.0 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 00 50 100 150 200 0 50 100 150 200 0 0 Ambient Temperature (C) Ambient Temperature (C) 0 50 100 150 200 0 50 100 150 200 Ambient Temperature (C) Ambient Temperature (C) Ambient Temperature (C) Ambient Temperature (C) SP20F Typical Fusing SP20 and SP20F Temperature Rise SP20F Typical Fusing SP20 and SP20F Temperature Rise SP-20 and SP20F SP20F Fusing Characteristic (Maximum & Typical Fusing Times) Temperature Rise Chart 1000 120 Maximum - all values 100 0.1 ohm 1 ohm 100 0.1 ohm 10 ohm 1 ohm 80 Typical 100 ohm 10 ohm 1000 ohm - 1R0 100 ohm 1000 ohm 60 10 Typical - 470R 40 Time (seconds) Power Input (watts) Time (seconds) Power Input (watts) 1 20 Ordering Proced ure Ordering Proced ure 0 Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of 4000 pieces 0 0.5 1.0 1.5 2.0 Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of 4000 pieces 0.1 SP20F 470R J I Power Input (watts) 10 15 20 25 30 35 40 45 50 55 60 SP20F 470R J I Type Initial Power (W) Type V alue (use IEC62 code) Value (use IEC62 code) T olerance (use IEC62 code) Ordering Data J 5% K 10% Tolerance (use IEC62 code) J 5% K 10% Sample PackPingart No. SP20F 1800 J LF XXX General Note I Tape 4000/reel Standard BI Technologies IRC Welwyn Packing TT Electronics reserves the right to make changes in product specification without notice or liability. General Note IRC Type I Tape 4000/reel Standard All information is subject to TT Electronics own data and is considered accurate at time of going to print. TT Electronics reserves the right to make changes in product specification without notice or liability. www.ttelectronics.com/resistors Recognition Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK All information is subject to TT Electronics own data and is considered accurate at time of going to print. UL = UL1412 recognised (optional characters) www.ttelectronicsresistors.com T TT Electronics plcelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK 09.18 T TT Electronics plcelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 Resistance Range 96 (First three signi cant gures plus fourth digit multiplier) 07.14 Example: 2203 = 220 Kohm 96 51R0 = 51 ohm 2R00 = 2.0 ohm Tolerance F = 1.0%, G = 2.0%, J = 5.0% RoHS Compliant (optional) Provides clearLead Fre Designation Speci cation Custom design identi er for non-standard products Wire and Film Technologies Division 4222 South Staples Street Corpus Christi Texas 78411 USA Telephone: 361 992 7900 Facsimile: 361 992 3377 Website: www.irctt.com SP20/SP20F Series Issue September 2010 Sheet 3 of 3 Temperature Rise (C) Power (watts) Power (watts) Power (watts) Power (watts) Power (watts) Fusing Time (s) Power (watts) Temp (C) Temp (C) Power (watts) Power (watts)