The following change wording is based on the original DCR425 plus discussions, reviews and conclusions made by the ESCC Executive Secretariat and Manufacturer C&K since December 2007.
The following items detail all the changes proposed and replace the original contents of this DCR. The changes also take into account the changes contained in approved, but not yet implemented, DCR316.
1 - Specification title on page 1 and in para 1.1 amended to also refer to 'PCB-type'.
2 - Spec Title & Para 1.1 & 2,
Delete reference to 3401/002 connectors.
Correct the titles for ESCC 3401 & 3401/001 as shown in the attachment.
3 - Table 1(a)
Add new Variants 13 to 16 details as shown in the attachment.
Amend Column 'Bucket Type' to be 'Rear End' and amend descriptions 'Solder' to be 'Solder Bucket' and 'Crimp' to be 'Crimp Barrel'.
4 - Figure 1, add '0' label to y axis.
5 - Figure 2(a), 2(b) & 2(c), In note 1 amend 'gold-plating' to be 'plating''
6 - Figure 2, Add new Figure 2(c) for new variants 13 to 16 added as shown in the attachment.
7 - Figure 2(c) Maximum protrusion figure (becomes Fig 2(d)) amended as shown in the attachment.
8 - Para 2, Delete items e & f and renumber remaining paras accordingly.
9 - Para 4.2.3, Replace 'None' by 'Not applicable'.
10 - Para 4.2.4,
Correct the para references in items a & b per ESCC 3401 as shown in the attachment.
Item c amended to read: 'Para 9.31 Solderability: Not applicable to Variants 07 to 12.' (the bit size requirement is transferred to new Para 4.3.12).
Delete item d.
Add new item:
'(d) Para 9.15, Joint Strength: The test shall be performed as specified in Para. 4.3.13.'
11 - Para 4.3.1,
Correct para reference in 1st sentence to be 'Para. 9.6'
Add new sentence:
'Overall dimensions are specified with compatible inserts in ESCC Detail Specification No. 3401/001.'
12 - Para 4.3.3,
Amend title to be '4.3.13 Joint Strength (Variants 07 to 12)' and delete title for Para 4.3.3.1.
Tensile Strength value & units converted from deca-Newtons to Newtons.
Para 4.3.3.2, Delete para in its entirety.
13 - Para 4.3.4, Delete para and move requirements to be part of Para 4.4.1. (see also Figures 2(a), 2(b), 2(c) notes 1)
14 - Para 4.3.5, Correct the title to be 'Engagement and Separation Forces' (new para 4.3.9) and amend the paras as shown in the attachment.
New Variants 14 & 16 are added to the title.
Maximum test pin Diameter is changed to be 3.632mm
'Insertion' & 'Withdrawal' are changed to be 'Engagement' & 'Separation' respectively.
Force units and values are converted from grams-force to Newtons.
15 - Para 4.3.6, Correct the title to be 'Contact Capability' (new para 4.3.3) and add new Variants 14 & 16 to the title.
Amend the table as shown in the attachment.
Column headings are swapped (e.g. 'Pick-up Weight' becomes 'Drop Weight').
Max & min pin diameters are amended to be 3.632mm and 3.581mm respectively.
16 - Para 4.3.7, Amend to be new para 4.3.10
17 - Para 4.3.8, Delete 'Test' from title and amend to be new para 4.3.11
18 - Para 4.3, Add new para '4.3.4 Contact Retention (In Insert)' with text:
'Contact retention within the insert shall be 40.86N. There shall be no displacement of the contact in excess of 0.3mm.'
19 - Para 4.3, Add new para '4.3.8 Contact Insertion and Withdrawal Forces' with text:
'The contact insertion and withdrawal forces shall be 65N maximum.'
20 - Para 4.3, Add new para '4.3.12 Solderability' with text:
'Not applicable to Variants 07 to 12. For all other Variants soldering iron bit size 7.5mm shall be used.'
21 - Para 4.3, Add new paras 4.3.5, 4.3.6, 4.3.7 as shown in the attachment.
22 - Para 4.4.1, Delete 2nd sentence 'The contacts shall .... MIL-C-14500.' and replace with:
'Gold plating thickness shall be 1.27um minimum over 1um minimum of copper.'
23 - Para 4.4, Add new para '4.4.2 Magnetism Level' as shown in the attachment.
24 - TABLE 2, Correct the para references from ESCC 3401 as shown in the attachment.
25 - Para 4.8.6, Amend the 2nd sentence as shown in the attachment.
26 - TABLE 6, Replace the table in its entirety by the new table 6 shown in the attachment.
Changes include:
- Delete item 'Female Contact Capability'
- Delete item 'Gold Plate Porosity'
- 'Contact Insertion and Withdrawal Forces' becomes part of new item 'Maintenance Aging'
- 'Crimp Visual Inspection' becomes part of new item 'Wiring'
- 'Contact Resistance' becomes part of each applicable environmental/endurance test
- 'Crimp Tensile Strength' is replaced by 'Joint Strength'
- 'Pull Test' is deleted
- 'Contact Retention (In Insert)' is added to 'High Temperature Storage'
- New items are added as shown in the attachment: 'Wiring', 'Vibration, 'Shock or Bump', 'Climatic Sequence', 'Seal Test', Joint Strength', 'Rapid Change of Temperature', 'Contact Retention (In Insert)', 'Permanence of Marking', 'Mating/Unmating Forces', 'Corrosion', 'Insert Retention (In Shell)', 'Jackscrew Retention', 'High Temperature Measurements', 'Overload Test', 'Maintenance Aging', Engagement and Separation Forces'.
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Justification:
After a full, detailed technical and editorial review of 3401/040 issue 3 many amendments have been identified as being necessary in order to be able to logically implement the changes in the original DCR425 & DCR316. The justification for all changes is as follows.
Note - The changes do not include any resulting from the generation of new ESCC spec No.80 (for D*BM savers); A new round of changes to the range of 3401/*** specs will be necessary once ESCC spec No.80 is published, in due course.
Editorial changes, proposed for the purposes of clarity, consistency and completeness, are based on the requirements specified in ESCC Generic specification No.3401 issue 1 plus the format and contents of other ESCC Detail specifications for contacts (e.g. 3401/005 issue 4). Editorial changes include the following items above:
Items 2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
Specific technical changes are justified as follows:
Items 1, 3, 6, 7, 14, 15 - Introduction of the new variants 13 to 16 per DCR316
Item 8, 22 - Definition of the plating materials & thickness' is considered sufficient without reference to the MIL specs; It is considered unnecessary to prescribe the actual material specifications to be applied by the Manufacturer (which will be controlled by their PID).
Item 10, 12, 26 - Pull test is no longer applicable to ESCC 3401.
Item 14 - Both engagement and separation forces need to be specified (related to the Contact Capability limits).
Maximum test pin diameter is corrected due to a typographic error.
Item 15 - Table columns are swapped in order to correct a typographic error. Pin diameters are amended to reflect the corrected values given in old para 4.3.5 (new para 4.3.9).
Item 18, 26 - Contact Retention (In Insert) needs to be specified. The value proposed (40.86N with 0.3mm max displacement) is the standard used by Manufacturer C&K (see also 3401/004).
Items 19, 26 - The contact insertion and withdrawal forces are not currently specified. The value proposed is the standard used by Manufacturer C&K.
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Justification:
as above
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