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www.vishay.com Vishay Mills Revision: 02-May-12 1 Document Number: 31801 For technical questions, contact: ww2aresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Wirewound Resistors, Non-Magnetic, Non-Inductive, Axial Lead

FEATURES

  • High temperature coating (> 350 °C)
  • Non-magnetic and all welded constructions greatly enhance frequency response. Combined with non-inductive Ayrton-Perry winding the inductive reactance and signal loss are almost totally eliminated.
  • Ideal for Audio Industry
  • Material categorization: For definitions of compliance please see www.vishay.com/doc?99912 Notes (1) Vishay Mills MRA models have two power ratings depending on the operation temperature and stability requirements. (2) Other tolerances may be available, contact factory STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL HISTORICAL MODEL POWER RATING (1) P25 °C W CHARACTERISTIC U + 250 °C POWER RATING (1) P25 °C W CHARACTERISTIC V + 350 °C TOLERANCE (2) RESISTANCE RANGE WEIGHT (typical) g TECHNICAL SPECIFICATIONS PARAMETER UNIT MRA RESI STOR CHARACTERISTICS Temperature Coefficient ppm/°C ± 30 for 10  and above; ± 50 for 1.0  to 9.9 ; ± 90 for 0.5  to 0.99  Terminal Strength lb 10 minimum Dielectric Withstanding Voltage V AC 500 for MRA-05 and 1000 for MRA-10 and MRA-12 Operating Temperature Range °C Characteristic U = - 65 to + 250, Characteristic V = - 65 to + 350 Maximum Working Voltage V ( P x R)1/2 GLOBAL PART NUMBER INFORMATION Global Part Numbering example: MRA-1225R00JE12 (visit www.vishay.net Vishay Dale parts numbering manual for all options) GLOBAL MODEL (6 digits) VALUE (5 digits) TOLERANCE (1 digit) PACKAGING CODE (3 digits) SPECIAL (up to 2 digits) (See Standard Electrical Specifications Global Model column for options) R = Decimal K = Thousand 1R500 = 1.5  1K500 = 1.5 k F = ± 1.0 % J = ± 5.0 % K = ± 10.0 % E07 = Tape/reel (MRA-10, MRA-12) E48 = Tape/reel (MRA-05) E12 = Bulk, up to 100 pc boxes (Dash Number) From 1 to 99 as applicable Historical Part Number example: MRA12W25R0J MRA12 W = STANDARD 25  5 % HISTORICAL MODEL TC RESISTANCE VALUE TOLERANCE RA - 1 2 2 5 R00JE 1M 2

www.vishay.com Vishay Mills Revision: 02-May-12 2 Document Number: 31801 For technical questions, contact: ww2aresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 DIMENSIONS in inches [millimeters] MATERIAL SPECIFICATIONS Element: Copper-nickel alloy or nickel-chrome alloy, depending on resistance value Core: Ceramic: Alumina Coating: Special high temperature silicone Standard Terminals: Tinned copper End Caps: Copper alloy Part Marking: MILLS, model, value, tolerance, date code DERATING MODEL DIMENSIONS in inches [millimeters] L ± 0.062 [1.57] L1 Max. D ± 0.031 [0.79] LD ± 0.002 [0.051] 1.50 [38.10] min. L D LD RATED POWER IN % AMBIENT TEMPERATURE IN °C 120 100 25- 65 - 50 250 50 3500 150 Characteristic U Characteristic V PERFORMANCE TEST CONDITIONS OF TEST TEST LIMITS (CHARACTERISTIC U) (CHARACTERISTIC V) Dielectric Withstanding Voltage 1000 V High Frequency Vibration Frequency varied 10 Hz to 2000 Hz, 20 g peak, 2 directions 6 h each ± (0.1 % + 0.05 ) R ± (0.2 % + 0.05 ) R High Temperature Exposure 250 h at + 250 °C for U Characteristic, + 350 °C for V Characteristic ± (0.5 % + 0.05 ) R ± (4.0 % + 0.05 ) R Low Temperature Moisture Resistance MIL-STD 202 Method 106 ± (0.2 % + 0.05 ) R ± (2.0 % + 0.05 ) R Shock, Specified Pulse M IL-STD 202 Method 213, 100 g’s for 6 ms, 10 shocks ± (0.1 % + 0.05 ) R ± (0.2 % + 0.05 ) R Thermal Shock Rated power applied until thermally stable, Short Time Overload 5 x rated power (5 W smaller), 10 x rated power (7 W and larger) for 5 s ± (0.2 % + 0.05 ) R ± (2.0 % + 0.05 ) R Terminal Strength 5 s to 10 s 10 pound pull test; torsion test - 3 alternating directions, 360 ° each ± (0.1 % + 0.05 ) R ± (1.0 % + 0.05 ) R

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