VHP100 Vishay Foil Resistors Ultra-High Precision Hermetically Sealed Bulk Metal Foil Resistor with Zero TCR, no Humidity Effect and 0.005 % Tolerance within a Unique Construction, Minimizing the Effects of Stress Factors FEATURES Essentially zero TCR Absolute resistance change (window): VHP100 < 60 ppm (- 55 C to + 125 C) VHP101 < 10 ppm (+ 15 C to + 45 C) Tolerance: to 0.005 % (50 ppm) - (available to 0.001 % (10 ppm)) No humidity effect: hermetically sealed against moisture INTRODUCTION Load life stability: 50 ppm typical for 2000 h, 70 C at The new VHP100 type represents a metrology breakthrough. 0.3 W A new construction concept combined with special Shelf life stability: 2 ppm typical after at least 6 years treatments make this resistor the first choice in the most Resistance range: 100 to 150 k (higher or lower values demanding instrumentation and laboratory applications. available on request) The ability of the new VHP100 to minimize the changes in resistance value when the resistor is subjected to load Vishay Foil resistors are not restricted to standard values variations and thermal stresses, ensure the ultra high specific as required values can be supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K) performances for the tight metrology specifications. The total error budget of 2 ppm drift and the high speed Electrostatic discharge (ESD) up to 25 000 V recovery represent an improvement of almost an order of Non inductive, non capacitive design magnitude on the earlier model. Rise time: 1 ns effectively no ringing Vishay has achieved an essentially Zero Temperature Thermal stabilization < 1 s Coefficient Resistor in the VHP100 type. This oil filled hermetically sealed device makes unique use of foil on Current noise: 0.010 V /V of applied voltage (< - 40 dB) RMS ceramic in such a way that self cancelling responses to Thermal EMF: 0.05 V/C typical temperature are produced by combining equal and opposite Voltage coefficient: < 0.1 ppm/V effects. This product is sold only in hermetic packages because applications requiring this level of temperature Inductance: < 0.08 H stability require humidity stability as well. Non hot spot design The value of the hermetic enclosure over the molded part is -7 Hermeticity: 10 atmospheric cc/s max. in the long term performance. The hermetic sealing prevents Terminal finish: lead (Pb)-free, tin/lead alloy the ingress of moisture and oxygen, while the oil acts as a thermal conductor. Compliant to RoHS directive 2002/95/EC Oil filled as standard, air filled available upon request TCR WINDOW DEFINITION Load-life stability can be considerably improved through The TCR of the VHP100 is so small that an additional in-house oriented tests definition - window, has been introduced. The window POST MANUFACTURING OPERATIONS definition requires that the absolute resistance remain within ENHANCE THE ALREADY GREATER the stated window over the temperature range specified. The resistance of the VHP100 resistor stays within a 60 ppm STABILITY OF FOIL RESISTORS window over the entire military temperature range of - 55 C These PMO operations are uniquely applicable to resistors to + 125 C (figures 1 and 3). made of resistive foil and they take the already superior A window of 10 ppm is available for the laboratory instrument stability of foil devices one step further. The PMO operations range (+ 15 C to + 45 C) see figure 4 - type VHP101. described are not applicable to thick film, thin film, or wire. They constitute an exercising of the resin that bonds the foil to the substrate. TCR TRACKING The exercises that are employed are (1) temperature cycling Tracking of the VHP100 resistor is also vastly superior to (2) short time overload, and (3) accelerated load life. conventional precision resistors. Typical 5 ppm/C precision resistors have a worst-case tracking of 10 ppm/C TEMPERATURE CYCLING (wirewounds, thick film, thin film) or a difference between This exercise is done initially in the chip stage of all resistors of 1000 ppm (10 ppm/C x 100 C) when production and will eliminate any fallout in the PMO cycling. temperature changes from + 25 C to + 125 C. For a The cycling exercises the bonding resin and relaxes the foil 3 ppm/C tracking (Vishay S102C) the difference will be without reducing the bonding strength. A small reduction in 300 ppm (3 ppm/C x 100 C) for the same temperature resistance is tolerable during this PMO operation. range. The VHP100 resistors will track to 60 ppm from - 55 C to + 125 C, a five-fold improvement over the S102C resistor. * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63003 For any questions, contact: foil vishaypg.com www.foilresistors.com Revision: 23-Mar-10 1VHP100 Vishay Foil Resistors SHORT TIME OVERLOAD FIGURE 4 -TYPICAL CURVES WITHIN 10 ppm WINDOW, The STO operation is performed on all resistors during manufacturing. Its function is to eliminate sports (if any) so VHP101 LABORATORY INSTRUMENT RANGE this PMO operation is further assurance. (+ 15 C to + 45 C): Typical TCR = 0.3 ppm/C, Ref. + 25 C ACCELERATED LOAD 10 ppm The standard load-life curve of a foil resistor exhibits a Window change in the beginning and not much change after the first 100 h. This knee in the load-life curve can be removed so + 15 + 20 + 25 + 30 + 35 + 40 + 45 + 50 that the resistor is now always on the flat part of the curve by Temperature (C) employing the PMO exercise of accelerated loading. How much acceleration is a function of the application and should be worked out between our applications engineering department and your design team. FIGURE 5 - STANDARD PRINTING These same operations when applied to resistors of thick film, thin film, and wire have vastly different consequences Front View Rear View L and are applicable to foil only. They are an enhancement to W Resistance foil performance but can drive other devices out of tolerance Value Code or open. The failure mechanisms in these other devises are VISHAY 100R01 XXXX 0.01 % Model Tolerance H too numerous to discuss here but suffice it to say, foil is the VHP100 Number XXXX least affected by these PMO operations and they should be Serial No. considered when the level of stability required is beyond the ST E published limits for standard product. Date Code LL 01 10 Year Week FIGURE 1 - A TYPICAL VHP100 RESISTANCE LS Lead Material 22 AWG TEMPERATURE CURVE (0.025 Dia) Solder Coated Copper RESISTANCE SPECIFIED IN TOLERANCE SIGNIFICANT DIGITS 60 ppm 1.0 % 3 Window 0.1 % 4 - 55 - 25 0 + 25 + 50 + 75 + 100 + 125 0.01 % 5 Temperature (C) 0.005 % 6 Note FIGURE 2 - POWER DERATING CURVE The number of significant digits of resistance accuracy to be printed on the resistor should be in accordance with the specified tolerance + 70 C Rated Power - 55 C + 100 % + 75 % TABLE 1 - VHP100 SERIES DIMENSIONS + 50 % INCHES mm + 25 % VHP100 W 0.162 0.020 4.11 0.51 0 - 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200 L 0.415 0.020 10.54 0.51 Ambient Temperature (C) VHP101 H 0.430 0.020 10.92 0.51 LL 1.000 0.125 25.4 3.18 FIGURE 3 - TYPICAL CURVES WITHIN THE 60 ppm (1) LS 0.150 0.010 3.81 0.25 WINDOW, VHP100 TCR FOR MIL RANGE ST 0.100 maximum 2.54 maximum (- 55 C to + 125 C): Typical TCR = 0.6 ppm/C, Ref. + 25 C E 0.070 maximum 1.78 maximum Note 60 ppm (1) For 0.200 lead spacing, specify VHP102 (60 ppm) or VHP103 Window (10 ppm). - 55 - 25 0 + 25 + 50 + 100 + 125 + 75 Temperature (C) www.foilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63003 2 Revision: 23-Mar-10 Deviation ppm Percent of Rated Power Deviation ppm Deviation ppm