IEC 60749-12:2018 pdf download

IEC 60749-12:2018 pdf download.Semiconductor devices – Mechanical and climatic test methods – Part 12: Vibration, variable frequency
1 Scope
This part of IEC 60749 describes a test to determine the effect of variable frequency vibration, within the specified frequency range, on internal structural elements. This is a destructive test. It is normally applicable to cavity-type packages. NOTE This test method describes a swept sine test. A random vibration test is described in JEDEC document JESD 22-B1 03.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp
4 Test apparatus
The apparatus for this test shall include equipment capable of providing the required variable frequency vibration at the specified level and the necessary optical and electrical equipment for post-test measurements.
5 Test method
The device shall be rigidly fastened on the vibration platform and the leads or cables adequately secured to avoid excessive lead resonance. The device shall be vibrated with simple harmonic motion having either a peak to peak amplitude of 1 ,5 mm (±1 0 %) or a peak acceleration of the specified test condition A, B, or C in Table 1 , below. Unless required by the relevant specification, the test conditions detailed in Table 1 below shall be applied. Test conditions shall be amplitude controlled below the crossover frequency and acceleration level controlled above. The vibration frequency shall be varied approximately logarithmically between 20 Hz and 2 000 Hz. The entire frequency range of 20 Hz to 2 000 Hz and return to 20 Hz shall be traversed in not less than 4 min. This cycle shall be performed 4 times in each of the orientations X, Y, and Z (total of 1 2 times), so that the motion shall be applied for a total period of not less than 48 min. NOTE Alternative test conditions are listed in IEC 60068-2-6 and JEDEC document JESD 22-B1 03.
6 Examination and test measurements
After completion of the test, an external visual examination of the marking shall be performed without magnification or with a viewer having a magnification no greater than 3X and a visual examination of the case, leads, or seals shall be performed at a magnification between 1 0X and 20X. This examination and any additional specified measurements and examination shall be made after completion of the final cycle or upon completion of a group, sequence, or subgroup of tests which include this test. When specified, devices with an internal cavity containing parts or elements subject to possible movement or breakage during vibration shall be further examined by radiographic examination or by delidding or opening and internal visual examination at 30X magnification to reveal damage or dislocation. Where this test is performed as part of a group or subgroup of tests, the post-test measurements or inspections need not be performed specifically at the conclusion of this test, but may be performed once at the conclusion of the group or subgroup. Hermeticity tests for hermetic devices, visual examination, and electrical measurements that consist of parametric and functional testing shall be specified in the applicable procurement document.
7 Failure criteria
A device shall be considered a failure if hermetic limits are exceeded for hermetic devices, if parametric limits are exceeded or if functionality cannot be demonstrated under nominal and worst-case conditions specified in the applicable procurement document. Mechanical damage such as cracking, chipping, or breaking of the package (1 0× to 20× magnification) shall also be considered as failures, provided such damage was not incurred by fixing or handling.