VCS1625P Vishay Foil Resistors High Precision Surface Mount Current Sensing Chip Resistor with Power Rating to 1 W, Temperature Coefficient of Resistance of : 2 ppm/C and Load Life Stability of 0.015% FEATURES NEW INTRODUCTION Model VCS1625P is a surface mount resistor designed with 4 pads for Kelvin connection. Utilizing VFR's (Vishay Foil Resistors') Bulk Metal(R) Foil as the resistance element, it provides performance capabilities far greater than other resistor technologies can supply in a product of comparable size. The key performance of the new VCS1625P is its high rated power up to 1W. This small device dissipates heat almost entirely through the pads so surface mount users are encouraged to be generous with the board's pads and traces. Gold terminations are available on special order. The four terminal device separates the current leads from the voltage sensing leads. This configuration eliminates the effect of the lead wire resistance from points A to B and C to D. VFR's application engineering department is available to advise and to make recommendations. For non-standard technical requirements and special applications, please contact foil@vishaypg.com. * Temperature coefficient of resistance (TCR): 2 ppm/C typical (- 55 C to + 125 C, + 25 C ref.) (see table 1) * Resistance range: 0.01 to 10 (for higher or lower values, please contact Application Engineering) * Vishay Foil resistors are not restricted to standard values, we can supply specific "as required" values at no extra cost or delivery (e.g. 1.234 vs. 1 ) * Resistance tolerance: to 0.1% (0.05% is also available) * Load life stability: 0.015 % at 70 C, 2000 h at rated power * Electrostatic discharge (ESD) at least to 25 kV * Short time overload < 0.005 % * Thermal stabilization time < 1 s (nominal value achieved within 10 ppm of steady state value) * Power rating: to 1 W at + 70 C (Figure 1) * Non inductive: non capacitive design * Rise time: 1 ns effectively no ringing * Current rating: 5 A maximum * Current noise: 0.010 VRMS/V of applied voltage (< - 40 dB) * Voltage coefficient: < 0.1 ppm/V * Non inductive: < 0.08 H * Non hot spot design * Prototype quantities available in just 5 working days or sooner * For better performances, please review the VCS1625ZP (Z-Foil) datasheet TERMINATIONS B * Two lead (Pb)-free options are available: gold plated or tin plated * Tin/lead plated C R I I A D V Z in ~ = Percent of Rated Power FIGURE 1 - POWER DERATING CURVE + 70 C - 55 C 100 75 50 25 0 - 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 Ambient Temperature (C) * Pb containing materials are not RoHS compliant, exemptions may apply Document Number: 63216 Revision: 13-Jun-11 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com 1 VCS1625P Vishay Foil Resistors TABLE 1 - TOLERANCE AND TCR VS. RESISTANCE VALUE (- 55 C to + 125 C, + 25 Ref.)(2) VALUE () TOLERANCE TYPICAL TCR MAXIMUM TCR > 2R000 to 10R000 0.2 %, 0.5 %, 1 % 2 ppm/C 5 ppm/C > 0R500 to 2R000 0.5 %, 1 % 2 ppm/C 10 ppm/C > 0R100 to 0R500 1% 2 ppm/C 15 ppm/C > 0R050 to 0R100 1% 2 ppm/C 20 ppm/C > 0R030 to 0R050 1% 2 ppm/C 30 ppm/C > 0R010 to 0R030 1% 2 ppm/C 50 ppm/C POWER RATING at + 70 C (1) MAXIMUM CURRENT (1) 1 W on FR4 PCB 5A Notes (1) Max Power or Max Current - whichever is lower (2) Tighter performances are available. Please contact application engineering foil@vishaypg.com FIGURE 2 - DIMENSIONS in Inches (Millimeters) Solder Pad Layout 0.806 (20.47) 0.020 (0.51) A I1 E1 I2 E2 B H Top View Electrical Schematic 0.020 (0.51) Mounting Pads (4) 0.806 (20.47) W 0.200 (5.08) L 0.070 (1.78) 2 oz. Copper (70 Microns) Coated by Solder mask Bottom View R E2 I2 0.260 (6.60) INCHES MILLIMETERS 0.250 0.010 6.35 0.25 H 0.160 0.010 4.06 0.25 W 0.040 maximum 1.02 maximum A 0.080 0.005 2.03 0.13 B 0.040 0.010 1.02 0.25 FIGURE 3 - TRIMMING TO VALUES (Conceptual Illustration)* E1 0.070 (1.78) Solder Coated Pads (Windows in Solder Mask) L I1 FIGURE 4 - TYPICAL RESISTANCE VERSUS TEMPERATURE CURVE AND ITS CHORD SLOPES (TCR) Current Path Before Trimming Interloop Capacitance Reduction in Series + 150 Current Path After Trimming Trimming Process Removes this Material from Shorting Strip Area Changing Current Path and Increasing Resistance Mutual Inductance Reduction due to Opposing Current in Adjacent Lines + 100 + 50 R 2 ppm/C (+ 25 C reference) 0 R (ppm) - 50 - 100 Note: Foil shown in black, etched spaces in white * To acquire a precision resistance value, the Bulk Metal(R) Foil chip is trimmed by selectively removing built-in "shorting bars." To increase the resistance in known increments, marked areas are cut, producing progressively smaller increases in resistance. This method eliminates the effect of "hot spot" and improves the long term stability of the Foil chips. www.vishayfoilresistors.com 2 - 150 - 200 - 50 For any questions, contact: foil@vishaypg.com - 25 0 + 25 + 50 + 75 + 100 + 125 Ambient Temperature (C) Document Number: 63216 Revision: 13-Jun-11 VCS1625P Vishay Foil Resistors TABLE 2 - PERFORMANCE SPECIFICATIONS MIL-PRF-55342 R LIMITS TYPICAL R LIMITS MAXIMUM R LIMITS (1) Thermal shock 5 x (- 65 C to + 150 C) 0.10 % 0.005 % (50 ppm) 0.01 % (100 ppm) Low temperature operation, - 65 C, 45 min at Pnom 0.10 % 0.005 % (50 ppm) 0.01 % (100 ppm) TEST Short time overload, 6.25 x rated power, 5 s 0.10 % 0.005 % (50 ppm) 0.02 % (200 ppm) High temperature exposure, + 150 C, 100 h 0.10 % 0.01 % (100 ppm) 0.02 % (200 ppm) Resistance to soldering heat 0.2 % 0.01 % (100 ppm) 0.03 % (300 ppm) Moisture resistance 0.2 % 0.01 % (100 ppm) 0.03 % (300 ppm) Load life stability 2000 h at 70 C at 1 W 0.5 % 0.015 % (150 ppm) 0.025 % (250 ppm) Note (1) Measurement error 0.001R POST MANUFACTURING OPERATIONS OR PMO Military applications can include requirements for performance under conditions of stress beyond the normal and over extended periods of time. This calls for more than just selecting a standard device and applying it to a circuit. The standard device may turn out to be all that is needed but an analysis of the projected service conditions should be made and it may well dictate a routine of stabilization known as post manufacturing operations or PMO. The PMO operations that will be discussed are only applicable to Foil resistors. They stabilize Foil resistors while they are harmful Document Number: 63216 Revision: 13-Jun-11 to other types. Short time overload, accelerated load life, and temperature cycling are the three PMO exercises that do the most to remove the anomalies down the road. Foil resistors are inherently stable as manufactured. These PMO exercises are only of value on foil resistors and they improve the performance by small but significant amounts. Users are encouraged to contact VFR's application engineering department for assistance in choosing the PMO operations that are right for their application. For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com 3 VCS1625P Vishay Foil Resistors TABLE 3 - GLOBAL PART NUMBER INFORMATION NEW GLOBAL PART NUMBER: Y08561R50000D9W (preferred part number format) DENOTES PRECISION VALUE CHARACTERISTICS (1) Y R= 0 = standard part, tin/lead termination 9 = standard part, lead (Pb)-free termination 129 = standard part, gold plated Other = custom Y 0 8 5 6 1 R 5 0 0 0 0 D 9 W PRODUCT CODE RESISTANCE TOLERANCE PACKAGING 0856 = VCS1625P A = 0.05 % B = 0.1 % E = 0.2 % D = 0.5 % F = 1.0 % G = 2.0 % J = 5.0 % R = tape and reel W = waffle pack FOR EXAMPLE: ABOVE GLOBAL ORDER Y0856 1R50000 D 9 W: TYPE: VCS1625P VALUE: 1.5 ABSOLUTE TOLERANCE: 0.5 % TERMINATION: lead (Pb)-free PACKAGING: waffle pack HISTORICAL PART NUMBER: VCS1625P 1R5000 TCR2 D S W (will continue to be used) VCS1625P 1R5000 TCR2 D S W MODEL OHMIC VALUE TCR RESISTANCE TOLERANCE TERMINATION PACKAGING VCS1625P 1.5 Characteristic S = lead (Pb)-free B = tin/lead G = gold plated T = tape and reel W = waffle pack A = 0.05 % B = 0.1 % E = 0.2 % D = 0.5 % F = 1.0 % G = 2.0 % J = 5.0 % Note (1) Application engineering release: for non-standard requests, please contact application engineering. www.vishayfoilresistors.com 4 For any questions, contact: foil@vishaypg.com Document Number: 63216 Revision: 13-Jun-11 Legal Disclaimer Notice Vishay Precision Group Disclaimer ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE. Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay Precision Group"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. The product specifications do not expand or otherwise modify Vishay Precision Group's terms and conditions of purchase, including but not limited to, the warranty expressed therein. Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase. 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No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any conduct of Vishay Precision Group. The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay Precision Group products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay Precision Group for any damages arising or resulting from such use or sale. Please contact authorized Vishay Precision Group 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 No.: 63999 Revision: 27-Apr-11 www.vishaypg.com 1