WSH2818 Vishay Dale Power Metal Strip(R) Resistors, High Power (5 W) Low Value (down to 0.001 ), 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 amplifiers * Proprietary processing technique produces extremely low resistance values * All welded construction * Solid metal Nickel-Chrome or Manganese-Copper alloy resistive element with low TCR (< 20 ppm/C) * Lead (Pb)-free construction * Very low inductance (< 5 nH) * Excellent frequency response to 50 MHz * Low thermal EMF (< 3 V/C) * Compliant to RoHS directive 2002/95/EC STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL POWER RATING P70 C W TOLERANCE % RESISTANCE RANGE WSH2818 5 (1) 1.0 0.001 to 0.1 Note (1) The WSH2818 is rated at 5 W with maximum surface temperature of 200 C TECHNICAL SPECIFICATIONS PARAMETER UNIT WSH2818 ppm/C 200 for 1 m to 5.99 m 75 for 6 m to 100 m Inductance H <5 Operating Temperature Range C - 65 to + 170 Maximum Continuous Current A (P/R)1/2 Weight/1000 pieces g 126 Temperature Coefficient GLOBAL PART NUMBER INFORMATION GLOBAL PART NUMBERING: WSH2818R1000FEA W S H 2 8 1 8 R 1 0 0 0 F E A GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL WSH2818 L = m* R = Decimal 4L000 = 0.004 R0100 = 0.01 F = 1.0 % J = 5.0 % 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 ** Please see document "Vishay Material Category Policy": www.vishay.com/doc?99902 www.vishay.com 28 For technical questions, contact: ww2bresistors@vishay.com Document Number: 30120 Revision: 06-Jul-09 WSH2818 Power Metal Strip(R) Resistors, High Power (5 W) Low Value (down to 0.001 ), Surface Mount Vishay Dale DIMENSIONS DIMENSIONS in inches [millimeters] MODEL L H RESISTANCE RANGE L WSH2818 W 0.001 to 0.0059 MODEL a b c WSH2818 a H T 0.125 0.032 0.180 0.280 0.010 0.010 0.010 0.010 [7.1 0.25] [4.6 0.25] [0.813 0.25] [3.18 0.25] 0.045 0.125 0.180 0.280 0.010 0.010 0.010 0.010 [7.1 0.25] [4.6 0.25] [1.143 0.25] [3.18 0.25] 0.006 to 0.1 T W SOLDER PAD DIMENSIONS in inches [millimeters] a b C 0.138 [3.5] 0.200 [5.1] 0.024 [0.61] Rated Power in % 120 100 80 60 40 20 0 - 65 - 50 - 25 0 25 50 Derating 75 100 125 150 170 Ambient Temperature in C 70 PERFORMANCE TEST CONDITIONS OF TEST TEST LIMITS Thermal Shock - 55 C to + 150 C, 1000 cycles, 15 min at each extreme 0.5 % R Short Time Overload 4 x rated power for 5 s 1.0 % R Low Temperature Operation - 65 C for 45 min 0.5 % R High Temperature Exposure 1000 h at + 170 C 1.0 % R Bias Humidity + 85 C, 85 % RH, 10 % Bias, 1000 h 0.5 % R Mechanical Shock 100 g's for 6 ms, 5 pulses 0.5 % R Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h 0.5 % R Load Life 1000 h at + 70 C, 1.5 h "ON", 0.5 h "OFF" 1.0 % R Resistance to Solder Heat + 260 C Solder, 10 s to 12 s dwell, 25 mm/s emergence 0.5 % R Moisture Resistance MIL-STD-202, Method 106, 0 % power, 7b not required 0.5 % R PACKAGING MODEL WSH2818 REEL TAPE WIDTH DIAMETER PIECES/REEL CODE 16 mm/Embossed Plastic 330 mm/13" 3500 EA Note * Embossed carrier tape per EIA-481-2 Document Number: 30120 Revision: 06-Jul-09 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com 29 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