WSMS2908 Vishay Dale Power Metal Strip® Meter Shunt Resistor, Very Low Value (down to 0.0001 Ω) FEATURES • High power to resistor size ratio • 5-terminal connection design • Use for single or multi-phase energy meters • Proprietary processing technique produces extremely low resistance values • All welded construction • Very low inductance (< 5 nH) • Low thermal EMF (< 3 μV/°C) • Compliant to RoHS directive 2002/95/EC STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL SIZE POWER RATING P70 °C W TOLERANCE % RESISTANCE VALUE RANGE Ω RESISTANCE VALUES CURRENTLY AVAILABLE (1) Ω WEIGHT (typical) g/1000 pieces WSMS2908 2908 3.0 5.0 50μ to 1000μ 100μ, 250μ, 300μ, 430μ, 500μ 2100 Note (1) Other values may be available, contact factory TECHNICAL SPECIFICATIONS PARAMETER UNIT RESISTOR CHARACTERISTICS ppm/°C ± 500 for 100 μΩ, ± 225 for 250 μΩ, ± 175 for 300 μΩ, 430 μΩ, and 500 μΩ Operating Temperature Range °C - 65 to + 170 Maximum Current Rating A (P/R)1/2 Temperature Coefficient GLOBAL PART NUMBER INFORMATION GLOBAL PART NUMBERING: WSMS2908L2500JK (WSMS2908, 0.00025 Ω, ± 5 %) W S M S 2 9 0 8 L 2 5 0 0 J K GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL WSMS2908 L = mΩ L1000 = 0.00010 Ω L2500 = 0.00025 Ω L3000 = 0.00030 Ω L4300 = 0.00043 Ω L5000 = 0.00050 Ω J = ± 5.0 % K = Bulk pack E = Tape and reel (Dash number) (Up to 2 digits) From 1 to 99 as applicable ** Please see document “Vishay Material Category Policy”: www.vishay.com/doc?99902 www.vishay.com 42 For technical questions, contact: [email protected] Document Number: 30160 Revision: 02-Jul-10 WSMS2908 Power Metal Strip® Meter Shunt Resistor, Very Low Value (down to 0.0001 Ω) Vishay Dale DIMENSIONS in inches (millimeters) 0.157 (4.0) 0.453 (11.5) 0.142 (3.6) 0.059 (1.5) 0.118 (3.0) 0.110 (2.8) 90° ± 0.2° 0.315 (8.0) 0.157 (4.0) Ø 0.165 (Ø 4.2) 2 PLACES 0.787 (20.0) CALIBRATION NOTCH 1.142 (29.0) ± 0.010 TERMINAL THICKNESS 0.040 (1.0) ALL VALUES Rated Power in % DERATING TOLERANCES ON DECIMALS XXX ± 0.005 120 100 80 RESISTANCE VALUE (μΩ) RESISTOR ELEMENT THICKNESS (inches) ELEMENT LENGTH ELEMENT MATERIAL 40 100 0.040 0.080 Mn-Cu 20 250 0.059 0.276 Mn-Cu 300 0.051 0.276 Mn-Cu 430 0.038 0.315 Mn-Cu 500 0.033 0.315 Mn-Cu 60 0 - 65 - 50 - 25 0 25 50 75 70 100 125 150 175 Ambient Temperature in °C PERFORMANCE TEST CONDITIONS OF TEST TEST LIMITS Thermal Shock - 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme ± 0.5 % ΔR Short Time Overload 5 x rated power for 5 s ± 0.5 % ΔR Low Temperature Operation - 65 °C for 45 min ± 0.5 % ΔR High Temperature Exposure 1000 h at + 170 °C ± 1.0 % ΔR Bias Humidity + 85 °C, 85 % RH, 10 % bias, 1000 h ± 0.5 % ΔR Mechanical Shock 100 g’s for 6 ms, 5 pulses ± 0.5 % ΔR Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± 0.5 % ΔR Load Life 1000 h at + 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± 1.0 % ΔR Moisture Resistance MIL-STD-202, method 106, 0 % power, 7b not required ± 0.5 % ΔR Document Number: 30160 Revision: 02-Jul-10 For technical questions, contact: [email protected] www.vishay.com 43 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1