WSHM2818 www.vishay.com Vishay Dale Power Metal Strip® Resistors, High Power (7 W) Low Value (down to 0.001 Ω), Surface Mount FEATURES • Improved thermal management incorporated into design • Ideal for all types of current sensing, voltage division and pulse applications including switching and linear power supplies, instruments, power amplifier • Proprietary processing technique produces extremely low resistance values • All welded construction • Very low inductance (< 5 nH) • Solid metal nickel-chrome or manganesecopper alloy resistive element with low TCR (< 20 ppm/°C) • Excellent frequency response to 50 MHz • Low thermal EMF (< 3 μV/°C) • AEC-Q200 qualified (1) • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 Note (1) Flame retardance test may not be applicable to some resistor technologies. STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL SIZE WSHM2818 RESISTANCE VALUE RANGE Ω POWER RATING P70 °C W Tol. ± 0.5 % Tol. ± 1.0 % WEIGHT (typical) g/1000 pieces 7 (2) 0.010 to 0.1 0.001 to 0.1 167.8 2818 Note (2) The WSHM2818 is rated at 7 W with maximum surface temperature of 180 °C. GLOBAL PART NUMBER INFORMATION Global Part Numbering: WSHM2818R1000FEA W S H GLOBAL MODEL WSHM2818 M 2 8 RESISTANCE VALUE L = mΩ* R = Decimal 4L000 = 0.004 Ω R0100 = 0.01 Ω 1 8 R 1 0 0 0 F E A TOLERANCE CODE PACKAGING CODE (3) SPECIAL D = ± 0.5 % F = ± 1.0 % EA = Lead (Pb)-free, tape/reel EK = Lead (Pb)-free, bulk (Dash number) (up to 2 digits) From 1 to 99 as applicable * Use “L” for resistance values < 0.01 Ω Note (3) Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standard packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces. Revision: 11-Jan-16 Document Number: 30188 1 For technical questions, contact: [email protected] 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 WSHM2818 www.vishay.com Vishay Dale TECHNICAL SPECIFICATIONS PARAMETER Component temperature coefficient (including terminal) (1) Element TCR (2) UNIT RESISTOR CHARACTERISTICS ppm/°C ± 200 for 1 mΩ to 5.99 mΩ, ± 75 for 6 mΩ to 100 mΩ ppm/°C < 20 Inductance nH <5 Operating temperature range °C -65 to +170 Maximum working voltage (3) V (P/R)1/2 Notes (1) Component TCR - total TCR that includes the TCR effects of the resistor element and the copper terminal. (2) Element TCR - only applies to the alloy used for the resistor element; refer to item 1 in the construction illustration on the following page. (3) Maximum working voltage - the WSHM is not voltage sensitive, but is limited by power / energy dissipation and is also not ESD sensitive. DIMENSIONS in inches (millimeters) L H a T b l W a Note • 3D models available: www.vishay.com/ppg?30188. MODEL WSHM2818 RESISTANCE RANGE Ω 0.001 to 0.1 DIMENSIONS SOLDER PAD DIMENSIONS L W H T a b l 0.280 ± 0.010 (7.1 ± 0.25) 0.180 ± 0.010 (4.6 ± 0.25) 0.059 ± 0.010 (1.50 ± 0.25) 0.125 ± 0.010 (3.18 ± 0.25) 0.138 (3.5) 0.200 (5.1) 0.024 (0.61) Rated Power in % DERATING 120 100 80 60 40 20 0 - 65 - 50 Revision: 11-Jan-16 - 25 0 25 50 75 100 125 150 170 Ambient Temperature in °C 70 Document Number: 30188 2 For technical questions, contact: [email protected] 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 WSHM2818 www.vishay.com Vishay Dale 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 4x rated power for 5 s ± 1.0 % 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 Resistance to solder heat +260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± 0.5 % ΔR Moisture resistance MIL-STD-202, method 106, 0 % power, 7b not required ± 0.5 % ΔR PACKAGING REEL MODEL WSHM2818 TAPE WIDTH DIAMETER PIECES/REEL CODE 16 mm/embossed plastic 330 mm/13" 3500 EA Note • Embossed Carrier Tape per EIA-481. ADDITIONAL RESOURCES Video: Power Metal Strip Short Time Overload Revision: 11-Jan-16 www.vishay.com/videos/resistors/power-metal-strip174-resistor-short-time-overload-product-demo Document Number: 30188 3 For technical questions, contact: [email protected] 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 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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 in any datasheet or in any other disclosure relating to any product. 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We confirm that all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU. Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21 conform to JEDEC JS709A standards. Revision: 02-Oct-12 1 Document Number: 91000