Ultra High Precision Vishay Foil Surface Mount …

1 Ultra High Precision Vishay Foil Surface Mount ResistorsMilitary and Space ApplicationsVishay Foil Resistors Document Number: 63147 For any questions, contact: 06-May-101 INTRODUCTIONMany manufacturers and users of Precision electronicequipment suffer unnecessarily with unexplained instabilitiesand drifts. They resign themselves to the need for constantadjustments and troubleshooting which could in fact the instability is traceable to a few fixed resistorswhich are not fixed at all. If these resistors would only retaintheir original values, there would be no need for costlycontrols and other compensating answer? A real Precision and stable Precision resistors offer you tight tolerance at theexpense of poor load life stability (1000 h or more), thermalstabilization and ESD sensitivity, others offer low TCR at theexpense of poor rise Vishay Bulk Metal Foil resistors offer you the completeset of top performance characteristics, including TCR as lowas ppm/ C with the Z-foil technology, a combination thatwill most often free your equipment from that tormenting now offers you the chance to make your own custombulk-metal resistors for breadboard, prototype, or evenproduction or write for information about our converters, feedback circuits, Precision amplifiers intest and measurement instrumentation, medical systems,satellites and aerospace systems, commercial and militaryavionics, weapons systems, audio systems, andhigh-temperature systems including down-hole to order.

2 Temperature coefficient of resistance (TCR) ppm/ C (military range) with the Z-foil technology Load life stability: to % at + 70 C, at rated power formore than 10 000 h Tolerance: best to % Power coefficient ( R due to self heating): to 5 ppm atrated power for Z-foil resistors Resistance range: from 2 m Vishay Foil resistors are not restricted to standard values,we can supply specific as required values at no extra costor delivery ( 1K2345 vs. 1K) Electrostatic discharge (ESD) immunity up to 25 000 V Fast terminal stabilization < 1 s Rise time: 1 ns effectively no ringing Thermal EMF < V/ C (Seebeck effect), especiallycritical for low resistive value in DC current/voltage Special non inductive and non capacitive design The short time overload test is also part of the standardproduction process (100 %) Vishay Foil resistors have been radiation tested There are four main factors which should be consideredwhen designing a board: TCR, PCR, thermal EMF andESD.

3 Vishay Foil resistors provide the best combination ofthe above factors Data package and test results are available, pleasecontact us THE Vishay BULK METAL FOIL RESISTORV ishay low cost high Precision Bulk Metal Foil resistors arethe result of an improved concept in resistor manufacturing:a proprietary Bulk Metal Foil of known and controllableproperties is applied to a special ceramic resistive pattern is then photo-etched by an Ultra -finetechnique developed by Vishay . This process results inresistor element characteristics of low TCR, long termstability, non inductive, excellent thermal stabilization, lowcapacitance and low Bulk Metal Foil is a special alloy chosen for its electricalmechanical and thermal characteristics. It is set on thesubstrate by a unique and proprietary process which doesnot subject the resistor element to the metallurgical changesthat occur during the winding of wire, or during theevaporative process used in other forms of resistormanufacturing.

4 Because the alloy in the Vishay resistor is notdrawn, wound, work hardened, or stressed in any way duringmanufacturing process, the resistor maintains all of itsMilitary and Space ApplicationsVishay Foil Resistors any questions, contact: Number: 631472 Revision: 06-May-10original design, physical and electrical characteristics. Thetemperature coefficient of the resistor is carefully controlledthrough compensating techniques which essentiallyeliminates the effects of the different coefficients ofexpansion of the materials used in the PRODUCT DESIGNC ustomers who require additional performance tests areencouraged to contact our application engineers. Our highlytrained application engineers are available to providetechnical assistance and can help in developing sourcecontrol drawings (SCD) which define the proper PMO (postmanufacturing operations) needed to achieve optimumcomponent reliability, stability and performance.

5 Examplesfor PMO tests include: short time overload, powerconditioning, thermal shock, thermal conditioning, MANUFACTURING OPERATIONSOR PMOM ilitary applications can include requirements forperformance under conditions of stress beyond the normaland over extended periods of time. This calls for more thanjust selecting a standard device and applying it to a standard device may turn out to be all that is needed butan analysis of the projected service conditions should bemade and it may well dictate a routine of stabilizationknown as post manufacturing operations or PMO. The PMOoperations that will be discussed are only applicable to Foilresistors. They stabilize Foil resistors while they are harmfulto other time overload, accelerated load life, and temperaturecycling are the three PMO exercises that do the most toremove the anomalies down the road.

6 Foil resistors areinherently stable as manufactured. These PMO exercisesare only of value on foil resistors and they improve theperformance by small but significant amounts. Users areencouraged to contact Vishay Foil applications engineeringfor assistance in choosing the PMO operations that are rightfor their Foil resistors are manufactured in a modern plantscomplex under exacting conditions of cleanliness. Whiterooms are used in several stages of production. The entireprocess is under close quality control handling, similar to the process used in semiconductormanufacture, ensures uniform quality. Each resistor elementis inspected and processed under high materials used in the resistor and in the manufacturingprocess are carefully controlled and inspected, withpermanent records maintained. All units are testedelectrically, mechanically and visually for conformance resistors are delivered in ESD approved (1)DSCC (Defense Supply Center Columbus)(2)EEE-INST-002 (Instruction for EEE Parts Selection, Screening, Qualification, and Derating)(3)EPPL (European Preferred Parts List) All the above resistors are also available on the shelf as standard productsTABLE 1 - DSCC, EEE-INST-002, AND EPPL(In accordance with.)

7 MIL-PRF-55342, MIL-PRF-55182, MIL-PRF-49465)TYPECONSTRUCTIONDSCC (1)EEE-INST-002 (2)EPPL (3)TYPICAL TCR MIL RANGE (ppm/ C)TYPICAL LOAD LIFE STABILITY 2000 hVSMP0805 Wrap around terminations07024 %VSMP120607025 VSMP150603010 VSMP201006001 VSMP251206002 VSM080507024 2 VSM120607025 VSM150603010 VSM201006001 VSM251206002 SMR1 DZMolded, flexible terminationswith robust construction06020 2 SMR3DZ06021 2 VCS1625 ZCurrent sense with Kelvin connections for a high accuracy08003 2 VCS1610 TBD CSM251207011 15 %CSM363707012 Military and Space ApplicationsVishay Foil Resistors Document Number: 63147 For any questions, contact: 06-May-103 FIGURE 1 - TRIMMING TO VALUES (Conceptual Illustration)TABLE 2 - VSMP0805 (Z-FOIL) SPACE QUALIFICATION TEST RESULTS PER MIL-PRF-55342H VALUE 5 KGROUPTESTSCONDITIONSAVERAGE R (ppm)MAXIMUM R (ppm)MINIMUM R (ppm) inspectionXXX84/0DC resistanceXXX84/0 IIResistance to soldering heatper MIL-PRF-5534228451410/0 TCRat - 55 C to + 25 C- + 25 C to + 125 temperature operation- 65 C at Pnom, 45 min- 27- 17- 3310/0 Overloadat x Pnom, 5 s47603710/0 High temperature operation100 h at + 150 C- 31- 13- 5510/0 IIIR esistance to soldering heatper , method 106- 241- 224- 26110/0 IVLoad life.

8 250 3034/0500 hat W at + 70 C- 3234/01000 h- 3834/02000 h- 3534/0 VSolderabilityat + 245 CXXX10/0 VISolderable mounting integrity30 s at 2 kgXXX10/0 VIIIT hermal shock100 x (- 65 C to + 150 C)- 510- 1010/0 Mutual InductanceReduction dueto OpposingCurrent inAdjacent LinesCurrent PathBefore TrimmingNote: Foil shown in black, etched spaces in whiteInterloop CapacitanceReduction in SeriesTrimming ProcessRemoves this Materialfrom Shorting Strip AreaChanging Current Pathand IncreasingResistanceCurrent PathAfter TrimmingMilitary and Space ApplicationsVishay Foil Resistors any questions, contact: Number: 631474 Revision: 06-May-10 Note Measurement error RC = - should be added to limitsTABLE 3 - CSM2512 EEE-INST-002 QCI PER AER #155518 ANDMIL-PRF-49465C #294499, VALUE 0R01 GROUPTESTSCONDITIONSAVERAGE R (ppm)MAXIMUM R (ppm)MINIMUM R (ppm) to solventMIL-STD-202G, method 215 VVV0/4 IIThermal shock5 x (- 65 C to + 125 C)43120- 400/10 TCRat - 55 C to + 25 C- + 25 C to + 125 C- temperature storage24 h at - 55 C92000/10 Overloadat 5 x Pnom, 5 s2960- 200/10 Moisture resistance10 days4270100/10 IIILoad life.

9 At 1 W at + 70 C250 h129230300/20500 h177290500/201000 h2714201300/202000 h3265201500/20 IVThermal shock5 x (- 65 C to + 125 C)1640- 200/30 Shock100 G, 6 ms020- 300/30 Vibration(10 to 2000 Hz) 20 G- 820- 400/30 VHigh temperature exposure1000 h at + 170 C250 h77415103000/301000 h137523507800/30 FIGURE 2 - VSMP 100 CYCLE THERMAL SHOCK - 65 C TO + 150 C, 10 UNITS EACH VALUE100 R/R (ppm)806040200- 20- 40- 60- 80- 100 VSMP08055 KVSMP201010 KVSMP120630 KVSMP120610 KVSMP2010100 KVSMP080512 KVishay Precision Group, Disclaimer NoticeDocument No.: 63999 Revision: 15-Jul-2014 DisclaimerALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, VPG ), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product specifications do not expand or otherwise modify VPG s terms and conditions of purchase, including but not limited to, the warranty expressed makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase.

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