VPG foil options: DSCC drawing vs. EEE-INST-002 testing
- Posted by Manuel Sánchez Ruiz
- On January 27, 2020
- 0
An increasing common trend within the use of resistors for the Space market is the use of precision resistors, which enjoy lower values of a Temperature Coefficient of Resistance (TCR).
An increasing common trend within the use of resistors for the Space market is the use of precision resistors, which enjoy lower values of a Temperature Coefficient of Resistance (TCR).
Among the manufacturers offering these parts, Vishay Precision Group (VPG) foil resistors provide a wide range of options suitable for all kind of applications. For Space applications, the two following opportunities arise:
The references to be used for ordering each option are:
- Resistors tested following a reduced flow based on EEE-INST-002 from NASA (“Instructions for EEE Parts Selection, Screening, Qualification, and Derating”).
- Resistors tested following DSCC Military Drawings from DLA (Defense Logistics Agency).
From VPG foil resistors portfolio, resistor series VSMP provides a compelling case to compare both alternatives, as they are offered according to both options, even if they are not formally qualified. These series give a nominal TCR value of 0.2 ppm/ºC over the full military temperature range and a typical Load Life Stability on 2000h of 0.005%.
| wdt_ID | VPG standard Type/Series | Testing iaw DLA DRAWING & MIL-PRF-55342 | Testing iaw EEE-INST-002 & MIL-PRF-55342 |
|---|---|---|---|
| 1 | VSMP0805 | DWG 07024 | Model 303134 |
| 4 | VSMP1206 | DWG 07025 | Model 303135 |
| 7 | VSMP1506 | DWG 03010 | Model 303136 |
| 10 | VSMP2010 | DWG 06001 | Model 303137 |
| 13 | VSMP2512 | DWG 06002 | Model 303138 |
Concerning the testing, the first row of the table can be used to make an excellent example of the similarities and differences in the screening on each option:
a. For DSCC 07024, the conformance inspection consists on Group A inspection (only for ER level parts; subgroups 1 & 3 and PPM reporting are not applicable) and Group B following MIL-PRF-55342:
b. On the other hand, the testing for Model 303134 includes the following:
As can be observed, some of the tests, as Thermal Shock, Solderability, TCR and Short-Time Overload performed on both of the flows. In contrast, others as pre-cap inspection, power conditioning and life test are performed only on the flow based on EEE-INST-002.
Further details on both flows and additional resistors series available from the manufacturer can find it at:
Having joined Alter Technology in 2015, he works as part of the EEE Parts Engineering Department, providing technical support in terms of Product Assurance and procurement to users in the frame of ESA space projects such as Euclid and Plato.
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