The proposed specification issue is now issue 2 draft C which reflects all agreed changes between the ESCC Technical Writer and the Manufacturer VISHAY S.A. Division Sfernice for DCR499.
The Manufacturer for this component has stated a preference to be identified as "VISHAY S.A. Division Sfernice (F)".
Additional change proposals 15 & 16 to be added to DCR499 are as follows:
New item 15, related to original DCR499 item 6), as follows:
15 Add new deviation to the generic spec in new Para 2.1.1 as follows:
2.1.1.1 Deviations from Screening Tests (Chart F3)
(a) Para. 8.3.2, Room Temperature Electrical Measurements (after Burn-in):
Additional limits to be applied during measurement of Resistance, calculated from the applicable tolerance plus an additional +/- 0.015%, shall be as follows:
(see attached 4001/011 draft 2C Para 2.1.1.1 for full details)
Electrical parameter failures to these additional limits shall be rejected and shall count towards the Check for Lot Failure during Chart F3. Electrical parameter failures to the original tolerance limits specified in Room Temperature Electrical Measurements herein, that meet these additional limits, shall still be rejected but shall not count towards the Check for Lot Failure during Chart F3.
New item 16, related to original DCR499 items 2) & 8), as follows:
16 Add new Appendix for VISHAY S.A. Division Sfernice (F) with the following 2 deviations:
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Items Affected: Specification Title / Based on Type Designation
Description of Deviations: The Manufacturer’s part type designation is: RCK02 HR
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Items Affected: High and Low Temperatures Electrical Measurements (Para. 2.6.2, Note 1)
Description of Deviations: The measurements of Resistance Change over temperature may be performed on a sample of 5 prevalues selected from the total production prevalue lot.
Justification:
The appendix has been discussed and agreed with Vishay. The following justifications apply for the 2 new change proposals 15 & 16:
New item 15:
The change takes into account the previous Table 4 resistance drift limit applied over burn-in.
New item 16:
A) Based on Type No.:
Vishay do not use the MIL part number (RNC90) to identify the ESCC component, their designation is RCK02 HR and would like the ESCC spec to reflect this.
B) TCR:
Previously against the old ESCC specs (generic & detail) only ESCC level B & LAT lots were submitted to TCR.
In addition Vishay has TCR results available for all prevalue lots.
Vishay propose to do TCR on finished pieces only for each new prevalue lot. (note - a prevalue lot could be used on several customer's orders.
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