Temperature control with a thermoelectric cooler (TEC) during laser decapsulation of plastic packages
Ablation was carried out on high voltage Schottky rectifiers at 25°C and −5°C (with a thermoelectric cooler or TEC), at 1.0 W and 3.9 W of laser power. In-situ measurement of the reverse current was conducted and correlated to the device junction temperature. It was found that the usage of a TEC increases the number of laser scans to reach the set current compliance of 100 µA after exposing the die, for ablation at 3.9 W, although eventual damage to the device is still unavoidable. The incorporation of a TEC below the sample is also demonstrated to be effective in reducing the device junction temperature during laser ablation.
Failure Analysis of Integrated Circuits: Tools and Techniques
Preface. 1. Introduction L.C. Wagner. 2. Electrical Characterization S. Frank, et al. 3. Package Analysis: SAM and X-Ray T.M. Moore, C. Hartfield. 4. Die Exposure P.D. Ngo. 5. Global Failure Site Isolation: Thermal Techniques D.L. Barton. 6. Failure Site Isolation: Photon Emission Microscopy Optical/Electron Beam Techniques E.I. Cole, D.L. Barton. 7. Probing Technology for IC Diagnosis C.G. Talbot. 8. Deprocessing D. Yim. 9. Cross-Section Analysis T. Haddock, S. Boddicker. 10. Inspection Techniques L.C. Wagner. 11. Chemical Analysis L.C. Wagner. 12. Energy Dispersive Spectroscopy P.D. Ngo. 13. Auger Electron Spectroscopy R.K. Lowry. 14. Secondary Ion Mass Spectrometry, SIMS K. Evans. 15. Failure Analysis Future Requirements D.P. Vallett. Index.
Geomagnetic micropulsations due to the motion of ocean waves
When sea waves move in the magnetic field of the earth, electric currents are generated in the water volume. These currents give rise to a small magnetic field which perturbs the earth's field. For plane trochoidal waves, this perturbing field decays exponentially with altitude and lies in a vertical plane which is oriented in the direction of wave propagation. The magnitude of the perturbing field also depends upon the magnitude and dip angle of the earth's field, and upon the height, wavelength, and propagation direction of the sea waves. For north-south waves, sea state 5, and an altitude of 100 feet, the perturbation is of the order of 0.1 gamma.