| 摘要 |
PURPOSE:To prevent unnecessary leakage current by coating at least the entire surface of a semiconductor memory chip with a film which has a property of passing ultraviolet ray but not passing unnecessary light except the ray. CONSTITUTION:A semiconductor memory chip 2 having a coating film 1 is assembled with a package 4 with ultraviolet ray passing glass 3. The wavelength range which contributes to the erasure of memory information is up to approx. 400nm, and even if the light having a wavelength longer than that is emitted, memory information is not erased. Accordingly, a protective film having long wavelength cutting filter characteristics is coated on the overall surface of the memory chip. |
