mi-Precision Power Semi-Precision Power ewound Resistor Wirewound Resistor Semi-Precision Power S SeriesWirewound Resistor * 1/4 watt to 10 watts AS / NAS Series to 10 watts * Alloy resistance wirewound to specific parameters including TCR's from 0.1 ohm to 175K ohms to 175K ohms * 5%, 3%, 1%, .5% tolerance AlphaDigital Marking All welded Alloylead resistance wirewound cap and / NAS Series * Resistance wire TCR 20 ppm/C %, 1%, AS .5% tolerance to specific parameters including TCR's from ** 0.1RoHS-compliant version available nce wire TCR 20 ohm toppm/C 175K ohms * 1/4 watt to 10 watts AlphaSilicone Digital Marking conformal All welded cap and lead * 5%, 3%, 1%, .5% tolerance ompliant version available * Resistance wire TCR 20 ppm/C coating Silicone Heat conducting conformal coating ceramic * RoHS-compliant version available Heat conducting ceramic ical Data Electrical Data pe 4 2 C B C 0 Power Rating 275CAS /AS / Commercial Power Rating 275C Commercial Similar Max. Hot Spot Range (ohms) Similar Max. Hot Spot Range (ohms) IRC Type MIL-R-26 MIL-R-26 Style 125C 25C Min. Max. Style 125C 25C Min. Max. AS-1/4 NAS-1/4 AS-1/2 RW81 NAS-1/2 AS-1 NAS-1 AS-1C NAS-1C RW70U AS-2 NAS-2 AS-2B NAS-2B AS-2C NAS-2C RW79U AS-3 NAS-3 AS-5 NAS-5 AS-7 NAS-7 AS-10 NAS-10 RW74U RW78U General Note RW81 0.25 RW70U 0.5 0.25 0.5 1 1 1 1 1 2 3 2 RW78U 3 2 2 2 0.1 0.1 2 3 2 3 4 3 .05 0.1 5 4 5 3 7 10 5 7 9 14 0.1 0.1 Max. 60 1-1K 0.1-1K 60 601-6K 0.1-6K 1-1K 0.1-1 3.8K 601-7.5K 0.1-7.5K 0.1-6 Min. 0.2 0.1 1.0K 6.0K 0.5 0.1 7.5K 6.0K 0.2 .05 2K 10 7.5K 0.2 0.5 1K 0.2 20K 0.25 0.1 2K 24K 0.1 18K 0.2 7.5K 30K 0.1 15K 0.1 0.1 0.1 20K 24K 60K 10 0.25 0.1 0.1 1-6K 1-7.5K 0.1-20K 12K 1K1-24K 1-2K 0.1-24K 1-18K 0.1-18K 1-30K 0.1-30K 30K 45K 175K 0.2 50K 10K 12K 3%, 5 .05-2K 1-20K 0.2 0.2 0.1 1-2K 3%, 5% 0.5%, 1% 10K 90K 18K 30K 0.5%, 1% Max. 3.8K 0.1 0.1 0.1 Range (ohms) 1.0K 0.1 Resistan (ohms) Min. 0.1 0.1 3 3 RW74U 1 2 1 RW79U 1 NAS / Non-Inductive Available Resistance NAS / Non-Inductive Available Range (ohms) (ohms) 1-20K 0.1-7. .05-2 0.1-20 1-60K 0.1-60K 1-24K 0.1-24 1-90K 7.5K 0.1-90K 1-18K 0.1-18 1-175K 0.1-175K 15K 1-30K 0.1-30 5 7 0.1 60K 0.1 30K 1-60K 0.1-60 7 9 0.1 90K 0.2 45K 1-90K 0.1-90 10 14 0.1 175K 0.2 50K 1-175K 0.1-17 IRC reserves the right to make changes in product specification without notice or liability. General Note All information is subject to IRC's 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. All information subject to TT electronics' is Street considered at78411 timeUSA of going to print. Wire and FilmisTechnologies Division *own 4222 data South and Staples * Corpusaccurate Christi Texas Telephone: 361 992 7900 * Facsimile: 361 992 3377 * Website: www.irctt.com A subsidiary of TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com AS / NAS Series Issue February 2010 Sheet 1 of 3 (c) TT electronics plc 01. 12 Semi-Precision Power Wirewound Resistor AS / NAS Series Semi-Precision Power Wirewound Resistor Physical Data B 1.50 MIN. (38.1) A D C NOTE: * Coating and marking is resistant to normal degreasing. Consult factory for special requirements. Please note lead length dimension change on the following two items only: AS / NAS -2B 1.3 min. AS / NAS -2C 1.3 min. IRC Type A0.032 B (max) C (max) D (Lead Diameter) AS-1/4 NAS-1/4 0.250 (6.4) 0.094 (2.4) 0.312 (7.9) 0.020 (0.5) AS-1/2 NAS-1/2 0.312 (7.9) 0.094 (2.4) 0.375 (9.5) 0.020 (0.5) AS-1 NAS-1 0.367 (9.3) 0.125 (3.2) 0.429 (10.9) 0.020 (0.5) 0.025 (0.64) AS-1C NAS-1C 0.256 (6.5) 0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 0.032 (0.8) AS-2 NAS-2 0.480 (12.2) 0.250 (6.3) 0.600 (15.2) 0.032 (0.8) AS-2B NAS-2B 0.540 (13.7) 0.219 (5.6) 0.663 (16.6) 0.032 (0.8) AS-2C NAS-2C 0.489 (11.0) 0.157 (4.0) 0.594 (15.1) 0.032 (0.8) AS-3 NAS-3 0.687 (17.5) 0.282 (7.2) 0.812 (20.6) 0.040 (1.0) AS-5 NAS-5 0.875 (22.2) 0.344 (8.8) 0.980 (24.9) 0.040 (1.0) AS-7 NAS-7 1.250 (31.8) 0.344 (8.8) 1.375 (35.0) 0.040 (1.0) AS-10 NAS-10 1.812 (46.0) 0.385 (9.8) 1.937 (49.2) 0.040 (1.0) 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 AS / NAS Series Issue February 2010 Sheet 2 of 3 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.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 01. 12 Semi-Precision Power Wirewound Resistor Semi-Precision Power Wirewound Resistor AS / NAS Series Power Derating Curve Environmental Testing at 25C Load Life 1000 hours 1.0% Moisture Resistance 1.0% Temperature Cycle 0.5% Short Time Overload 0.5% Low Temperature Operation 0.5% Solder Heat 0.25% Shock 0.5% Vibration 0.5% Percent of 125C Power Rating Max 'R Test Condition 200 175 AS- 1/4, 1/2, 1, 1C AS- 3, 2 150 AS- 2C AS- 5, 10 125 AS- 2B 100 AS- 7 75 0 25 75 125 175 225 275 Ambient Temperature (C) Selected Pulse-Handling Capability @ 125C Energy (watts-second) 14 AS- 2A 12 AS- 3 AS- 2 10 8 AS- 2B 6 AS- 2C 4 AS- 1 2 0 0.1 AS- 1/2 AS- 1/4 0.2 0.5 1 2 5 10 Resistance (ohms) Ordering Data Sample Part No. AS 3 27R0 F LF XXX IRC Type Non-inductive styles will be indicated as NAS Power 3 = 3 watts (See specification chart for other power ratings) Resistance Value (100 ohms and greater - First 3 significant digits plus 4th digit multiplier) Example: 100 ohms = 1000, 1000 ohms = 1001, 150,000 ohms = 1503 (Less than 100 ohms - "R" is used to designate decimal) Example: 51 ohms = 51R0, 1 ohm = 1R00, 0.25 ohms = R250 Tolerance J = 5%; H = 3%; F = 1%; D = 0.5% Lead Free Construction RoHS compliance status: products carrying the LF designator will provide 100% Matte Sn plated leads. Omission of the LF designator explicitly specifies standard Sn/Pb plated lead wires. Specification Number (Optional) Custom design identifier 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 AS / NAS Series Issue February 2010 Sheet 3 of 3 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.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 01. 12