Experience & Issues FromSolvent Testing

Joseph FedericoDirector of Operations

NJ Micro Electronic Testing Inc.joef@njmet.com

1240 Main Avenue, Clifton, NJ 07011 (973)-546-5393 Ext. 218Website: www.njmetmtl.com

Issue: One Solvent Test ApproachDoes Not Fit All Components

Over the past years, new techniques of black top, remark and resurface marking tests have been implemented to discover non authentic marking and coating processes on electronic component devices. These tests can be highly effective at discovering counterfeit plastic components, however the same tests can result in false positives when used on ceramic packages that have not been blacktopped / coated or on can package devices that have not been resurfaced.

The objective of this presentation is to illustrate the proper groups associated with solvent testing.

Background

1.

Industry Alert and Experiences

Improper Exercises and Applications of Solvent

Testing

2.

The following example will demonstrate a Texas Instruments SNJ54HC4040J which failed Dynasolve testing that should have never been exercised.

EXPERIENCE - IMPROPER REQUEST OF A HERMETICALLY SEALED

(Non-Resurfaced) PACKAGE FAILING DYNASOLVE TEST

3.

Example – Wrong Exercise of SNJ54HC4040J Failing Dynasolve Test on a Non-Resurfaced Package

Hermetically Sealed Ceramic Package

4.

The following example will demonstrate a National LM158H that failed Mineral Spirits testing which should have never been exercised on a Can (Non-Resurfaced) Package.

EXPERIENCE - IMPROPER REQUEST OF A CAN (Non-Resurfaced) PACKAGE FAILING MINERAL SPIRITS TESTING

5.

Example - Wrong Exercise of Can (Non-Resurfaced) PartFailing Mineral Spirits Testing

TO-Can Device LM158H

6.

7.

Group OneNon Military Non PCB Assembly

Solvent Test for Remarking and ResurfacingSAE AS6081 Para 4.2.6.4.3

Industry ObservationScrape Test

Experiences in Scrape Testing Have Been Helpful in Early Stage Detection of Resurfaced Electronic Components

8.

Single Use 6" in Length Sterile Applicator Cotton tip and Wood Shaft Specimen Data Collection Applicator

9.

Industry Recommendation

MINERAL SPIRITS TEST FAILURES ONJM3851-00801BCA

10.

ACETONE TEST FAILURES ON ATMEL AT49BV642D-70TU

11.

1-METHYL 2-PYRROLIDONE TEST FAILURES ON ATMEL AT17C256-10JI

12.

DYNASOLVE TEST FAILURES ON CYPRESS CY7057V-15AI

13.

• Marking Permanency TestingMil Standard 883 (Microcircuits) and 750 (Semiconductors)

Recommended for Hermetically Sealed Ceramic and Can Packages which show no evidence of resurfacing as well as Aerospace and Military Marking Tests.

Proper Exercises and Experiences:Group Two

Military and Industrial Non Resurfaced PCB Assemblies

14.

Test Marking Permanency Per MIL STD 883, MIL STD 750

Application of Resistanceto Solvents Test

Step A15.

Marking Permanency Per MIL STD 883, MIL STD 750 Step B

Application of Resistanceto Solvents Test

16.

Marking Permanency Per MIL STD 883, MIL STD 750 Step C / D

Application of Resistanceto Solvents Test

17.

18.

Recommended

• 3 Long Rows of Hard Bristle• Non Reactive Material

Example: Parts Passing MIL STD Marking Permanency Test

Hermetically Sealed Ceramic Package

19.

Conclusion: Industry Recommendation

While Mineral Spirits testing, Acetone testing, 1- Methyl 2- Pyrrolidone testing and Dynasolve testing has been vital in uncovering many anomalies associated with parts that have been remarked or resurfaced, we have shown that using these techniques improperly on hermetically sealed ceramic devices or can packages that have not been resurfaced can result in false positives.

20.

Proper Exercises and Applications• Group 1: Marking Permanency Testing - Mil Standard 883 and 750

• Group 2: Solvent Test for Remarking - SAE AS6081 Para 4.2.6.4.3

• Group 2: Solvent Test for Resurfacing - SAE AS6081 4.2.6.4.3