MANUFACTURE OF TAPE CARRIER FOR TAB PLATED WITH TIN ELECTROLESSLY

摘要

PURPOSE: To prevent generation of tin whiskers by a method wherein a lead pattern is treated by acid pickling using the mixture of alkanolsulfonic acid and phenolsulfonic acid after tin-plating has been provided. ;CONSTITUTION: Electroless tin plating of 0.5 to 1.0μm is provided on the copper lead on the surface of a TAB tape carrier at the liquid temperature of 60 ±1°C for the dipping period of 4 to 6 minutes. An acid pickling treatment is conducted on the non-electrolytic tin-plated TAB tape carrier by dipping for one minute in the mixed solution of alkanolsulfonic acid and phenolsulfonic acid of liquid concentration of 30vol% and liquid temperature of. Tin whiskers can be removed efficiently by setting the temperature of the acidic solution and the treatment time for the acid pickling treatment in accordance with the state of generation of the tin whiskers. As a result, short circuit is not generated between leads by the growth of tin whiskers, and high reliability can be obtained for the TAB tape carrier.;COPYRIGHT: (C)1995,JPO