power transistor failure modes weak current

* For detailed heat treatment conditions, consult with each flux or adhesive manufacturer.Įlectrolytic corrosion may be caused by halogen component or sulfur component. (2) When using flux or adhesive, use the appropriate heat treatment* to make halogen substances inactive.(1) Remove halogen substance residue with a non-halogen cleaning agent.

The following two methods can be applied for preventing migration. attaches with an active force, it causes deterioration of the protective membrane, and when moisture and an electric potential exists, migration may be happen. But when halogen substances (F, Cl, Br) contained in flux etc. Migration generally occurs when the three factors of electricity, water and halogen substance co-exist, by generating “Sn migration” on the exterior (solder) of the electronic component and “Ag migration” generated within the component.Īs the Ag electrode is fully covered with a protective membrane or plating, Ag migration isn’t generated in a normal operating environment. The metal generated on the cathode grows into a tree-like shape and reduces insulation between poles, eventually causing a short-circuit. When voltage is applied between these electrodes, the anode metal is ionized and moves to the facing cathode and regenerates as metal again.

Migration is generally a phenomenon occurring with a pair of electrodes placed in a high humidity environment. Next section describes failure phenomena with their mechanism and solutions in detail. 1 Chip resistor structure (outline)Īctual failures are primarily resistance value increase/open circuit (wire breakage). Summary of failure causes of chip resistor Fig. Resistance value reduction, shorted circuit Outline of failure phenomenaĬhip resistor failure phenomena can be briefly divided into seven groups as shown in the table below, and their failure modes are resistance value increase/open circuit (wire breakage) and resistance value decrease/short circuit.

This article discusses failure phenomenon and mechanism of chip resistors along with their solutions. Technical Information Chip resistor’s failure phenomenon/mechanismĬhip resistors are rarely break down compared to other electronic components, but they still generate failures caused by excessive load or under severe operating environments.

Power transistor failure modes weak current