WSHM2818 www.vishay.com Vishay Dale Power Metal Strip(R) Resistors, High Power (7 W), Low Value (down to 0.001 ), Surface Mount FEATURES DESIGN SUPPORT TOOLS Models * Improved thermal management incorporated into design * All welded construction of the Power Metal Strip resistors are ideal for all types of current sensing, voltage division, and pulse applications * Proprietary processing technique produces extremely low resistance values * Sulfur resistance by construction that is unaffected by high sulfur environments * Very low inductance (< 5 nH) * Solid metal nickel-chrome or manganesecopper alloy resistive element with low TCR (< 20 ppm/C) * Low thermal EMF (< 3 V/C) * AEC-Q200 qualified (1) * PATENT(S): www.vishay.com/patents * Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 click logo to get started Design Tools Available Available Notes * Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924 (1) Flame retardance test may not be applicable to some resistor technologies STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE VALUE RANGE GLOBAL MODEL SIZE POWER RATING P70 C W Tol. 0.5 % Tol. 1.0 % WEIGHT (typical) g/1000 pieces WSHM2818 2818 7 (1) 0.010 to 0.1 0.001 to 0.1 167.8 WSHM2818 2818 6 0.101 to 0.2 0.101 to 0.2 167.8 Note (1) The WSHM2818 is rated at 7 W with maximum surface temperature of 180 C GLOBAL PART NUMBER INFORMATION Global Part Numbering: WSHM2818R1000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options) W S H GLOBAL MODEL WSHM2818 M 2 8 RESISTANCE VALUE L = m* R = decimal 4L000 = 0.004 R0100 = 0.01 1 8 R 1 0 0 0 F E A TOLERANCE CODE PACKAGING CODE (1) 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 Notes * SMD Power Metal Strip Marking (www.vishay.com/doc?30327) (1) 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 PATENT(S): www.vishay.com/patents This Vishay product is protected by one or more United States and international patents. Revision: 18-Jun-2018 Document Number: 30188 1 For technical questions, contact: ww2bresistors@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 WSHM2818 www.vishay.com Vishay Dale TECHNICAL SPECIFICATIONS PARAMETER UNIT Component temperature coefficient (including terminal) (1) ppm/C Element TCR (2) ppm/C RESISTOR CHARACTERISTICS 200 for 1 m to 5.99 m 75 for 6 m to 200 m < 20 Inductance nH <5 Operating temperature range C -65 to +170 Maximum working voltage (3) V (P x 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 Notes * 3D models available: www.vishay.com/doc?30324 * Surface mount solder profile recommendations: www.vishay.com/doc?31052 RESISTANCE RANGE MODEL WSHM2818 DIMENSIONS 0.001 to 0.2 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) TYPICAL SENSING LAYOUT SENSING WITH VIA LAYOUT (best performance) a f a e a a c b b l l d c a b c l a b d e f l 0.138 (3.51) 0.210 (5.33) 0.020 (0.51) 0.024 (0.61) 0.143 (3.63) 0.210 (5.33) 0.026 (0.66) 0.105 (2.67) O 0.020 (0.50) 0.024 (0.61) Note * Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place the sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR Revision: 18-Jun-2018 Document Number: 30188 2 For technical questions, contact: ww2bresistors@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 WSHM2818 www.vishay.com Vishay Dale Rated Power in % DERATING PULSE CAPABILITY 120 click to get started 100 80 60 40 US ILL 20 0 -65 -50 -25 0 25 50 75 100 125 150 170 Ambient Temperature in C 70 VE TI A TR S SE O RP PU LY ON www.vishay.com/resistors/power-metal-strip-calculator PERFORMANCE TEST CONDITIONS OF TEST TEST LIMITS Thermal shock -55 C to +150 C, 1000 cycles, 15 min at each extreme 0.5 % Short time overload 4x rated power for 5 s 1.0 % Low temperature operation -65 C for 24 h 0.5 % High temperature exposure 1000 h at +170 C 1.0 % Bias humidity +85 C, 85 % RH, 10 % bias, 1000 h 0.5 % Mechanical shock 100 g's for 6 ms, 5 pulses 0.5 % Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h 0.5 % Load life 1000 h at 70 C, 1.5 h "ON", 0.5 h "OFF" 1.0 % Resistance to solder heat +260 C solder, 10 s to 12 s dwell, 25 mm/s emergence 0.5 % Moisture resistance MIL-STD-202, method 106, 0 % power, 7b not required 0.5 % PACKAGING REEL MODEL WSHM2818 TAPE WIDTH DIAMETER PIECES/REEL CODE 16 mm/embossed plastic 330 mm / 13" 3500 EA Notes * Embossed carrier tape per EIA-481 * Additional packaging details at www.vishay.com/doc?20051 ADDITIONAL RESOURCES Video: Power Metal Strip Short Time Overload Revision: 18-Jun-2018 www.vishay.com/videos/resistors/power-metal-strip174-resistor-short-time-overload-product-demo Document Number: 30188 3 For technical questions, contact: ww2bresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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ALL RIGHTS RESERVED Revision: 08-Feb-17 1 Document Number: 91000 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Vishay: WSHM2818R0150FEA WSHM2818R0220FEA WSHM2818R1000FEB WSHM28183L000FEA WSHM2818R0300FEA WSHM2818R0400FEA WSHM2818R0500FEB WSHM28181L000FEA WSHM2818R0330FEB WSHM2818R0500JEA WSHM2818R0100FEB WSHM28181L000FEB WSHM2818R0680FEA WSHM2818R0800FEA WSHM28186L000FEA WSHM28189L000FEA WSHM2818R1000FEA WSHM2818R0500FEA WSHM2818R0770FEA WSHM2818R0100FEA WSHM2818R0200FEB WSHM28185L000FEB WSHM28188L000FEA WSHM2818R0600FEA WSHM2818R0330FEA WSHM28182L000FEA WSHM2818R0900FEA WSHM2818R0200FEA WSHM2818R0660FEA WSHM2818R0250FEA WSHM2818R0470FEA WSHM2818R0250JEA WSHM2818R0820FEA WSHM28185L000FEA WSHM28184L000FEA WSHM28182L500FEA WSHM2818R0700FEA WSHM28186L800FEA WSHM2818R0680FEB WSHM28182L000FEB WSHM2818R0800FEB WSHM2818R0150FEB WSHM2818R0470FEB WSHM28184L000FEB WSHM28183L000FEB WSHM2818R0900FEB WSHM28182L500FEB WSHM2818R0820FEB WSHM28186L800FEB WSHM2818R0660FEB WSHM28189L000FEB WSHM2818R0400FEB WSHM28186L000FEB WSHM2818R0770FEB WSHM28188L000FEB WSHM2818R0600FEB WSHM2818R0700FEB WSHM28187L000FEA