Semi-PSemi-Prrecisionecision PowePowerr Resistors Semi-Precision Power WWelwynelwyn ComponentsComponents WWiirrewoundewound ResistoResistorr Semi-Precision Power Welwyn Components Wirewound Resistor ASAS SerieSeriess Wirewound Resistor 0.250.25 toto 1010 wattswatts AS Series TToleranceolerance downdown toto 0.5%0.5% 0.25 to 10 watts (N)AS Series 0.10.1 ohmohm toto 175K175K ohmsohms Tolerance down to 0.5% 0.25 to 10ResistanceResistance watts wiwirree TCRTCR 2020 ppm/Cppm/C 0.1 ohm to 175K ohms Tolerance down to 0.5% Resistance wire TCR 20 ppm/C 0.1 oh m to 150K ohms Resistance wire TCR 20 pp m/C Non i nductive (NAS) option Pb-free option is RoHS compliant 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) ElectricalElectrical DatDataa EquivalenEquivalentt PowerPower RatinRatingg AS StandardAS Standard RangRangee NAS Non-inductive NAS Non-inductive AAvailablevailable Tolerance (%)Tolerance (%) Range (ohms)Range (ohms) MIL-R-2MIL-R-266 (watts(watts)) (ohms(ohms)) Electrical Data TTypypee StylStylee 125125CC 2525CC MinMin.. MaxMax.. MinMin.. MaxMax.. <1R0<1R0 1R01R0 Equivalent Power Rating AS Standard Range NAS Non-inductive Available Tolerance (%) 11 (N)AS-(N)AS- //44 11 0R20R2 4K04K0 1R01R0 500R500R RW81RW81 0.250.25 Range (ohms) MIL-R-26 (watts) (ohms) 11 (N)AS-(N)AS- //22 0.50.5 11 0R240R24 6K06K0 1R01R0 3K03K0 Type Style 125C 25C Min. Max. Min. Max. <1R0 1R0 1 (N)AS-1(N)AS-1 22 0R10R1 7K57K5 0R10R1 3K83K8 RW70URW70U 11 (N)AS- /4 1 0R2 4K0 1R0 500R RW81 0.25 1 (N)AS-1C(N)AS-1C 11 22 R05R05 2K02K0 10R10R 1K01K0 (N)AS- /2 0.5 1 0R24 6K0 1R0 3K0 33 0R10R1 20K20K 0R50R5 10K10K (N)AS-2(N)AS-2 RW79URW79U 22 (N)AS-1 2 0R1 7K5 0R1 3K8 RW70U 1 3, 53, 5 0.5, 1, 3, 50.5, 1, 3, 5 33 44 0R10R1 33K33K 0R50R5 12K12K (N)AS-1C (N)AS-2B(N)AS-2B 1 2 R05 2K0 10R 1K0 (N)AS-2C(N)AS-2C 33 0R10R1 18K18K 0R20R2 7K57K5 22 3 0R1 20K 0R5 10K (N)AS-2 RW79U 2 3, 5 0.5, 1, 3, 5 33 55 0R10R1 30K30K 0R50R5 15K15K (N)AS-3(N)AS-3 3 4 0R1 33K 0R5 12K (N)AS-2B 77 0R10R1 60K60K 0R80R8 30K30K (N)AS-5(N)AS-5 RW74URW74U 55 (N)AS-2C 3 0R1 18K 0R2 7K5 2 77 99 0R10R1 90K90K 1R01R0 45K45K (N)AS-7(N)AS-7 3 5 0R1 30K 0R5 15K (N)AS-3 1414 0R10R1 150K150K 0R30R3 51K51K (N)AS-10(N)AS-10 RW78URW78U 1010 7 0R1 60K 0R8 30K (N)AS-5 RW74U 5 7 9 0R1 90K 1R0 45K (N)AS-7 14 0R1 150K 0R3 51K (N)AS-10 RW78U 10 PhysicalPhysical DatDataa DimensionsDimensions Inches Inches (mm)(mm) Physical Data TTypypee A 0.032 (0.81)A 0.032 (0.81) B (max)B (max) C (max) C (max) D (nom) D (nom) E (min) E (min) 11 (N)AS-(N)AS- //44 0.312 (7.9) 0.312 (7.9) 0.020 (0.5) 0.020 (0.5) 1.50 (38.1)1.50 (38.1) 0.250(6.4)0.250(6.4) 0.094 (2.4) 0.094 (2.4) Dimensions Inches (mm) 11 (N)AS-(N)AS- //22 0.312(7.9)0.312(7.9) 0.094 (2.4) 0.094 (2.4) 0.375 (9.5) 0.375 (9.5) 0.020 (0.5) 0.020 (0.5) 1.50 (38.1)1.50 (38.1) Type A 0.032 (0.81) B (max) C (max) D (nom) E (min) 1 (N)AS-1(N)AS-1 0.125 (3.2) 0.125 (3.2) 0.429 (10.9) 0.429 (10.9) 0.020 (0.5)0.020 (0.5) 1.50 (38.1)1.50 (38.1) 0.367(9.3)0.367(9.3) (N)AS- /4 0.020 (0.5) 1.50 (38.1) 0.250(6.4) 0.094 (2.4) 0.312 (7.9) 1 (N)AS-1C(N)AS-1C 0.256(6.5)0.256(6.5) 0.115 (2.9) 0.115 (2.9) 0.303 (7.7) 0.303 (7.7) 0.025 (0.64)0.025 (0.64) 1.50 (38.1)1.50 (38.1) (N)AS- /2 EE AA 0.312(7.9) 0.094 (2.4) 0.375 (9.5) 0.020 (0.5) 1.50 (38.1) (N)AS-2(N)AS-2 0.250 (6.3) 0.250 (6.3) 0.600 (15.2) 0.600 (15.2) 0.032 (0.8) 0.032 (0.8) 1.50 (38.1)1.50 (38.1) 0.480(12.2)0.480(12.2) (N)AS-1 0.020 (0.5) 1.50 (38.1) 0.367(9.3) 0.125 (3.2) 0.429 (10.9) DD BB (N)AS-2B(N)AS-2B 0.540(13.7)0.540(13.7) 0.219 (5.6) 0.219 (5.6) 0.663 (16.6) 0.663 (16.6) 0.032 (0.8) 0.032 (0.8) 1.30 (33.0)1.30 (33.0) (N)AS-1C 0.256(6.5) 0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 1.50 (38.1) E A CC (N)AS-2C(N)AS-2C 0.157 (4.0) 0.157 (4.0) 0.594 (15.1) 0.594 (15.1) 0.032 (0.8) 0.032 (0.8) 1.30 (33.0)1.30 (33.0) 0.489(11.0)0.489(11.0) (N)AS-2 0.600 (15.2) 0.032 (0.8) 1.50 (38.1) 0.480(12.2) 0.250 (6.3) D B (N)AS-3(N)AS-3 0.687(17.5)0.687(17.5) 0.282 (7.2) 0.282 (7.2) 0.812 (20.6) 0.812 (20.6) 0.040 (1.0) 0.040 (1.0) 1.50 (38.1)1.50 (38.1) (N)AS-2B 0.540(13.7) 0.219 (5.6) 0.663 (16.6) 0.032 (0.8) 1.30 (33.0) C (N)AS-5(N)AS-5 0.344 (8.8) 0.344 (8.8) 0.980 (24.9) 0.980 (24.9) 0.040 (1.0) 0.040 (1.0) 1.50 (38.1)1.50 (38.1) 0.875(22.2)0.875(22.2) (N)AS-2C 0.594 (15.1) 0.032 (0.8) 1.30 (33.0) 0.489(11.0) 0.157 (4.0) (N)AS-7(N)AS-7 1.250(31.8)1.250(31.8) 0.344 (8.8) 0.344 (8.8) 1.375 (35.0) 1.375 (35.0) 0.040 (1.0) 0.040 (1.0) 1.50 (38.1)1.50 (38.1) (N)AS-3 0.687(17.5) 0.282 (7.2) 0.812 (20.6) 0.040 (1.0) 1.50 (38.1) (N)AS-10(N)AS-10 0.385 (9.8) 0.385 (9.8) 1.937 (49.2) 1.937 (49.2) 0.040 (1.0) 0.040 (1.0) 1.50 (38.1)1.50 (38.1) 1.812(46.0)1.812(46.0) (N)AS-5 0.980 (24.9) 0.040 (1.0) 1.50 (38.1) 0.875(22.2) 0.344 (8.8) (N)AS-7 1.250(31.8) 0.344 (8.8) 1.375 (35.0) 0.040 (1.0) 1.50 (38.1) (N)AS-10 1.937 (49.2) 0.040 (1.0) 1.50 (38.1) 1.812(46.0) 0.385 (9.8) GeneralGeneral NoteNote WWelwynelwyn ComponentsComponents rreserveseserves thethe rightright toto makemake changeschanges inin pprroductoduct specificationspecification withoutwithout noticenotice oror liabilitliabilityy AllAll informationinformation isis subjectsubject toto WWelwynelwynss ownown datadata andand isis consideconsiderreded accurateaccurate atat timetime ofof goinggoing toto print.print. AA subsidiarysubsidiary of of TTTT electelectrronicsonics plcplc General Note General Note WWelwynelwyn ComponentsComponents LimitedLimited Bedlington,Bedlington, NorthumberlandNorthumberland NE22NE22 7AA,7AA, UKUK 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. TTelephone:elephone: +44+44 (0(0)) 16701670 822181822181 Facsimile:Facsimile: +44+44 (0(0)) 16701670 829465829465 Email:Email: info welwyn-tt.cominfo welwyn-tt.com WWebsite:ebsite: wwwwww.welwyn-tt.com.welwyn-tt.com IssueIssue DD 03.0603.06 All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of 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 9191 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plcTelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 05.20 91Semi-Precision Power Wirewound Resistor Semi-Precision Power Semi-Precision Power (N)AS Series Wirewound Resistor Wirewound Resistor Welwyn Components AS Series Welwyn Components AS Series Performance Data Power Derating Temperature Rise 25C Power Derating Temperature Rise 25C 275 200 AS-7, 10 275 200 250 AS-1/4, 1/2, 1, 1C AS-7, 10 AS-1,2 250 AS-1/4, 1/2, 1, 1C 175 AS-3, AS-5 AS-1,2 175 AS-3, 2 AS-3, AS-5 200 AS-3, 2 AS-2B AS-1C 200 150 AS-2C AS-2C AS-2B AS-1C 150 AS-2C AS-2C AS-5, 10 150 AS-1/2 125 AS-5, 10 150 AS-1/2 125 AS-2B 100 AS-2B 100 100 AS-1/4 AS-7 100 AS-1/4 AS-7 50 75 50 75 25 25 0 25 75 125 175 225 275 0 40 80 120 160 200 0 25 75 125 175 225 275 0 40 80 120 160 200 Ambient Temperature (C) Percent of 25C Power Rating Ambient Temperature (C) Percent of 25C Power Rating Temperature Rise 125C Selected Pulse-Handling Capability 125C Temperature Rise 125C Selected Pulse-Handling Capability 125C 275 14 AS-7, 10 275 14 AS-7, 10 12 250 12 AS-3, AS-5 AS-3 250 AS-2 AS-2B AS-1,2 AS-1C 10 AS-3, AS-5 AS-3 AS-2 AS-2B AS-2C AS-1,2 AS-1C 10 AS-2C AS-1/2 8 AS-1/2 8 200 AS-2B 6 200 AS-2B 6 AS-2C AS-1/4 4 AS-2C AS-1/4 4 AS-1 150 2 AS-1 AS-1/2 150 2 AS-1/2 AS-1/4 125 0 AS-1/4 0 40 80 120 160 200 0.1 0.2 0.5 1 2 5 10 0 125 Resistance (ohms) 0 40 80 120 160 200 0.1 0.2 0.5 1 2 5 10 Percent of 125 C Power Rating Resistance (ohms) Percent of 125 C Power Rating Environmental Testing at 25C Environmental Testing Environmental Testing at 25C Test Condition Max R Test Condition Max R Load Life 1000 hours 1.0% Load Life 1000 hours 1.0% Moisture Resistance 1.0% Moisture Resistance 1.0% Temperature Cycle 0.5% Temperature Cycle 0.5% Short Time Overload 0.5% Short Time Overload 0.5% Low Temperature Operation 0.5% Low Temperature Operation 0.5% Solder Heat 0.25% Solder Heat 0.25% Shock 0.5% Shock 0.5% Vibration 0.5% Vibration 0.5% General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors TT Electronics plc 05.20 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 92 92 Percent of 125C Power Rating Hot Spot Hot Spot Temperature (Temperature (C)C) Percent of 125C Power Rating Hot Spot Temperature (C) Hot Spot Temperature (C) Energy (watts-second) Energy (watts-second)