H Series Vishay Foil Resistors New Generation of Secondary Standards Hermetically Sealed High Precision Bulk Metal Foil Technology Resistors with TCR of 2 ppm/C, Tolerance of 0.001 % and Load Life Stability of 0.005 % (Metrology, Laboratory, Instrumentation, Industrial) FEATURES Temperature coefficient of resistance (TCR): 2 ppm/C typical (- 55 C to + 125 C, + 25 C ref.). For ultra high performances (instrumentation and metrology) please refer to the last page Resistance range: 5 to 1.84 M (higher or lower values of resistance available) Vishay Foil resistors are not restricted to standard values specific as required values can be supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K) INTRODUCTION Power rating: 0.3 W to 2.5 W at + 25 C (depending on model - see table 2) The H series resistors are oil-filled, hermetically sealed ultra Tolerance: to 0.001 % (10 ppm) precision resistors and are used as secondary standards for Load life stability to 0.002 % (20 ppm) at 25 C, 2000 h metrology applications. at rated power Load life stability can be considerably improved The hermetic sealing eliminates the ingress of moisture and through in-house stabilization oxygen, while the oil acts as a thermal conductor, thus Shelf life stability: 2 ppm for at least 6 years eliminating the long-term degradation elements of unsealed (unaffected by humidity) resistors, while at the same time allowing the device to Electrostatic discharge (ESD) up to 25 000 V accept short periods of overload without degradation. Rise time: 1 ns effectively no ringing Vishays Bulk Metal Foil outperforms all other resistor Thermal stabilization time < 1 s (nominal value achieved technologies available today for applications that require within 10 ppm of steady state value) precision and stability. When combined with the hermetic Current noise: 0.010 V /V of applied voltage (< - 40 dB) RMS sealing and oil filling, the H series resistors become the most Thermal EMF: 0.05 V/C typical precise and stable resistors available. Voltage coefficient: < 0.1 ppm/V Non-inductive: < 0.08 H With accuracies of 0.001 %, a resistance range from 5 to 1.84 M, and long term shelf life of less than 2 ppm, Non-inductive, non-capacitive design these devices are virtually secondary standards that can be Non hot spot design carried in sets for daily or periodic calibration of factory Terminal finish available: lead (Pb)-free or tin/lead alloy measurement equipment. Impervious to harmful environments - oil-filled Compliant to RoHS directive 2002/95/EC The H series is available with laboratory and metrology Prototype quantities available in just 5 working days level precision and long-term stability with additional or sooner. For more information, please contact in-house oriented processes such as: chip stabilization, foil vishaypg.com special TCR plotting, additional treatments for ultra stability and special post manufacturing operations For better performances (values, TCR, tolerance, stability), please see the HZ series (PMO). (Please refer to the last page) TABLE 1 - TCR VS. RESISTANCE VALUE FIGURE 1 - SHELF LIFE - VHA518-11 12K9 VS. QHE TYPICAL TCR AND MAX. SPREAD RESISTANCE (- 55 C to + 125 C, + 25 C ref.) 1 VALUE ( ) (ppm/C) 0.9 0.8 0.7 100 to < 1M84 2 2.5 0.6 0.5 50 to < 100 2 3.5 0.4 0.3 5 to < 50 2 4.5 0.2 0.1 Note 0 For maximum TCR < 1 ppm/C, see VHP100 and contact - 0.1 0 100 200 300 400 500 600 700 800 900 1000 application engineering Time (Days) * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63006 For any questions, contact: foil vishaypg.com www.foilresistors.com Revision: 23-Mar-10 1 Resistance Change (ppm)H Series Vishay Foil Resistors FIGURE 2 - POWER DERATING CURVE - 55 C + 100 + 75 + 50 + 25 0 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 Ambient Temperature (C) FIGURE 3 - TRIMMING TO VALUES FIGURE 4 - TYPICAL RESISTANCE/ (Conceptual Illustration) TEMPERATURE CURVE + 150 + 100 Current Path Interloop Capacitance Before Trimming + 50 Reduction in Series C Alloy 2 ppm/C R R 0 Current Path (ppm) After Trimming - 50 Mutual Inductance Trimming Process Reduction due - 100 Removes this Material to Change in 2 ppm/C from Shorting Strip Area Current Direction Changing Current Path - 150 and Increasing Resistance - 200 - 55 - 25 0 + 25 + 50 + 75 + 100 + 125 Ambient Temperature (C) Note: Foil shown in black, etched spaces in white TABLE 2 - MODEL SELECTION STANDARD RESISTANCE MAXIMUM (3) DIMENSIONS RESISTANCE POWER AVERAGE TOLERANCE PER RANGE MODEL WORKING CONSTRUCTION RANGE RATING WEIGHT NUMBER VOLTAGE BRIEF RANGE TIGHTEST () at + 25 C (g) (2) INCHES mm () (%) W: 0.162 0.020 4.11 0.51 Oil-filled, tinned L: 0.415 0.020 10.54 0.51 5 to 100K 0.3 W copper leads, nickel H: 0.430 0.020** 10.92 0.51 VHP202 300 1.4 > 100K to 150K 0.2 W shell, kovar and LL: 1.000 0.125 25.4 3.18 (4) glass header LS: 0.150 0.010 3.81 0.25 ST: 0.095 max. 2.41 max. L: 0.625 0.031 15.88 0.79 5 to 100K 0.3 W VHA412 250 4.6 D: 0.375 0.031 9.53 0.79 > 100K to 150K 0.2 W LL: 1.000 min. 25.4 min. (1) L: 1.000 0.031 25.4 0.79 1K to 0.001 5 to 200K 0.5 W VHA414 350 7.3 D: 0.375 0.031 9.53 0.79 > 200K to 335K 0.3 W LL: 1.000 min. 25.4 min. 500 to < 1K 0.0025 L: 0.625 0.031 15.88 0.79 5 to 300K 0.75 W 50 to < 500 0.005 VHA512* 350 6.3 D: 0.500 0.031 12.7 0.79 > 300K to 500K 0.4 W LL: 1.000 min. 25.4 min. 30 to < 50 0.01 5 to 400K 1.0 W VHA516-4* Oil-filled, > 400K to 668K 0.5 W 20 to < 30 0.02 L: 1.000 0.031 25.4 0.79 tinned copper leads, 5 to 500K 1.25 W VHA516-5* 500 9.2 D: 0.500 0.031 12.7 0.79 tinned brass shell, > 500K to 835K 0.6 W 10 to < 20 0.05 LL: 1.000 min. 25.4 min. kovar and 5 to 600K 1.5 W VHA516-6* glass end bells > 600K to 1M 0.7 W 5 to < 10 0.1 5 to 700K 1.75 W VHA518-7* > 700K to 1M17 0.8 W 5 to 800K 2.0 W VHA518-8* > 800K to 1M34 0.9 W L: 1.500 0.031 38.1 0.79 5 to 900K 2.25 W VHA518-9* 600 13.5 D: 0.500 0.031 12.7 0.79 > 900K to 1M5 1.0 W LL: 1.000 min. 25.4 min. 5 to 1.0M 2.5 W VHA518-10* > 1.0M to 1M67 1.1 W 5 to 1.0M 2.5 W VHA518-11* > 1.0M to 1M84 1.2 W Notes * Available in a 4-lead terminal ** 0.375 H available See next page for numbered footnotes www.foilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63006 2 Revision: 23-Mar-10 Percent of Rated Power