Semi-PSemi-Prrecisionecision PowePowerr Resistors Semi-Precision Power WWiirrewoundewound ResistoResistorr WWelwynelwyn ComponentsComponents Make Possible Wirewound Resistor Welwyn Components Semi-Precision Power 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 10 watts ResistanceResistance 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 175K ohms Resistance wire TCR 20 pp m/C Non i nductive (NAS) option Pb-free option is RoHS compliant All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) ElectricalElectrical DatDataa EquivalenEquivalentt PowerPower RatinRatingg CommeCommerrcialcial RangRangee Non-InductiveNon-Inductive RangRangee AAvailablevailable ResistanceResistance Electrical DatMIL-R-2MIL-R-2a 66 (watts(watts)) (ohms(ohms)) (ohms(ohms)) (ohms)(ohms) TTypypee StylStylee 125125CC 2525CC MinMin.. MaxMax.. MinMin.. MaxMax.. 0.5%,0.5%, 11%% 3%,3%, 5%5% Equivalent Power Rating Commercial Range Non-Inductive Range Available Resistance 11 (N)AS-(N)AS- //44 0R1-1K00R1-1K0 RW81RW81 0.250.25 11 0R10R1 1K01K0 0R20R2 60R60R 1R0-1K01R0-1K0 MIL-R-26 (watts) (ohms) (ohms) (ohms) 11 (N)AS-(N)AS- //22 0.50.5 11 0R10R1 6K06K0 0R50R5 60R60R 1R0-6K01R0-6K0 0R1-6K00R1-6K0 Type Style 125C 25C Min. Max. Min. Max. 0.5%, 1% 3%, 5% 1 (N)AS-1(N)AS-1 0R1-7K50R1-7K5 RW70URW70U 11 22 0R10R1 7K57K5 0R20R2 3K83K8 1R0-7K51R0-7K5 (N)AS- /4 RW81 0.25 1 0R1 1K0 0R2 60R 1R0-1K0 0R1-1K0 1 (N)AS-1C(N)AS-1C 11 22 R05R05 2K02K0 10R10R 1K01K0 1R0-2K01R0-2K0 R05-2K0R05-2K0 (N)AS- /2 0.5 1 0R1 6K0 0R5 60R 1R0-6K0 0R1-6K0 10K10K 0R1-20K0R1-20K (N)AS-2(N)AS-2 RW79URW79U 22 33 0R10R1 20K20K R25R25 1R0-20K1R0-20K (N)AS-1 RW70U 1 2 0R1 7K5 0R2 3K8 1R0-7K5 0R1-7K5 33 44 0R10R1 24K24K 0R10R1 12K12K 1R0-24K1R0-24K 0R1-24K0R1-24K (N)AS-1C (N)AS-2B(N)AS-2B 1 2 R05 2K0 10R 1K0 1R0-2K0 R05-2K0 (N)AS-2C(N)AS-2C 7K57K5 0R1-18K0R1-18K 22 33 0R10R1 18K18K 0R20R2 1R0-18K1R0-18K RW79U 2 3 0R1 20K R25 10K 1R0-20K 0R1-20K (N)AS-2 33 55 0R10R1 30K30K 0R10R1 15K15K 1R0-30K1R0-30K 0R1-30K0R1-30K (N)AS-3(N)AS-3 3 4 0R1 24K 0R1 12K 1R0-24K 0R1-24K (N)AS-2B 30K30K 0R1-60K0R1-60K (N)AS-5(N)AS-5 RW74URW74U 55 77 0R10R1 60K60K 0R10R1 1R0-60K1R0-60K (N)AS-2C 0R1-18K 2 3 0R1 18K 0R2 7K5 1R0-18K 77 99 0R10R1 90K90K 0R20R2 45K45K 1R0-90K1R0-90K 0R1-90K0R1-90K (N)AS-7(N)AS-7 3 5 0R1 30K 0R1 15K 1R0-30K 0R1-30K (N)AS-3 50K50K 0R1-175K0R1-175K (N)AS-10(N)AS-10 RW78URW78U 1010 1414 0R10R1 175K175K 0R20R2 1R0-175K1R0-175K 0R1-60K (N)AS-5 RW74U 5 7 0R1 60K 0R1 30K 1R0-60K 7 9 0R1 90K 0R2 45K 1R0-90K 0R1-90K (N)AS-7 0R1-175K RW78U 10 14 0R1 175K 0R2 50K 1R0-175K (N)AS-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 0.250(6.4)0.250(6.4) 0.094 (2.4) 0.094 (2.4) 0.312 (7.9) 0.312 (7.9) 0.020 (0.5) 0.020 (0.5) 1.50 (38.1)1.50 (38.1) 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 0.367(9.3)0.367(9.3) 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) (N)AS- /4 0.250(6.4) 0.094 (2.4) 0.312 (7.9) 0.020 (0.5) 1.50 (38.1) 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) EE AA (N)AS- /2 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 0.480(12.2)0.480(12.2) 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) (N)AS-1 0.367(9.3) 0.125 (3.2) 0.429 (10.9) 0.020 (0.5) 1.50 (38.1) 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 0.489(11.0)0.489(11.0) 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) (N)AS-2 0.480(12.2) 0.250 (6.3) 0.600 (15.2) 0.032 (0.8) 1.50 (38.1) 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) (N)AS-5(N)AS-5 C 0.875(22.2)0.875(22.2) 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) (N)AS-2C 0.489(11.0) 0.157 (4.0) 0.594 (15.1) 0.032 (0.8) 1.30 (33.0) (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 1.812(46.0)1.812(46.0) 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) (N)AS-5 0.875(22.2) 0.344 (8.8) 0.980 (24.9) 0.040 (1.0) 1.50 (38.1) (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 1.812(46.0) 0.385 (9.8) 1.937 (49.2) 0.040 (1.0) 1.50 (38.1) GeneralGeneral NoteNote WWelwynelwyn ComponentsComponents rreserveseserves thethe rightright toto makemake changeschanges inin pprroductoduct specificationspecification withoutwithout noticenotice oror liabilitliabilityy AA subsidiarysubsidiary of of AllAll informationinformation isis subjectsubject toto WWelwynelwynss ownown datadata andand isis consideconsiderreded accurateaccurate atat timetime ofof goinggoing toto print.print. TTTT electelectrronicsonics plcplc General Note General Note WWelwynelwyn ComponentsComponents LimitedLimited Bedlington,Bedlington, NorthumberlandNorthumberland NE22NE22 7AA,7AA, UKUK 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 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.ttelectronicsresistors.com 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 02.15 91Semi-Precision Power Wirewound Resistor Make Possible Semi-Precision Power (N)AS SeriesSemi-Precision Power 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-2A, 2C 250 175 AS-1/4, 1/2, 1, 1C AS-3, AS-5 AS-2A, 2C 175 AS-3, 2 AS-3, AS-5 200 AS-3, 2 AS-2B 200 150 AS-2A, 2C AS-2C AS-2B 150 AS-2A, 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 0 40 80 120 160 200 25 75 125 175 225 275 0 25 75 125 175 225 275 0 40 80 120 160 200 Percent of 25C Power Rating Ambient Temperature (C) Percent of 25C Power Rating Ambient Temperature (C) Temperature Rise 125C Selected Pulse-Handling Capability 125C Temperature Rise 125C Selected Pulse-Handling Capability 125C 275 14 275 AS-7, 10 AS-2A 14 AS-7, 10 12 AS-2A 250 12 AS-3, AS-5 AS-3 250 AS-2 AS-2B AS-2 10 AS-3, AS-5 AS-3 AS-2 AS-2B AS-2A, 2C AS-2 10 AS-2A, 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 10 125 0 0 40 80 120 160 200 0.1 0.2 0.5Resistance (ohms)1 2 5 10 Percent of 125C Power Rating Resistance (ohms) Percent of 125C 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 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.ttelectronicsresistors.com TT Electronics plc 02.15 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 Hot Spot Temperature (C) Percent of 125C Power Rating Hot Spot Temperature (C) Percent of 125C Power Rating Hot Spot Temperature (C) Hot Spot Temperature (C) Energy (watts-second) Energy (watts-second)