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1-2 ESD Precautions Electrostatically Sensitive Devices(ESD) Some semiconductor (solid state) devices can be (5) Do not use freon-propelled chemicals. These can damaged easily by static electricity. generate electrical charges sufficient to damage ESD Such components commonly are called Electros- devices. tatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some (6) Do not remove a replacement ESD device from its field-effect transistors and semiconductor chip protective package until immediately before you are components. The following techniques should be used ready to install it. (Most replacement ESD devices to help reduce the incidence of component damage are packaged with leads electrically shorted together caused by static electricity. by conductive foam, aluminum foil or comparable conductive materials). (1) Immediately before handling any semiconductor component or semiconductor-equipped assembly, (7) Immediately before removing the protective drain off any electrostatic charge on your body by materials from the leads of a replacement ESD touching a known earth ground. Alternatively, obtain device, touch the protective material to the chassis or and wear a commercially available discharging wrist circuit assembly into which the device will be strap device, which should be removed for potential installed. shock reasons prior to applying power to the unit under test. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety (2) After removing an electrical assembly equipped with precautions. ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent elec- (8) Minimize bodily motions when handling trostatic charge buildup or exposure of the assembly. unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing (3) Use only a grounded-tip soldering iron to solder or together of your clothes fabric or the lifting of your unsolder ESD devices. foot from a carpeted floor can generate static electricity sufficient to damage an ESD device). (4) Use only an anti-static solder removal devices. Some solder removal devices not classified as "anti- static" can generate electrical charges sufficient to damage ESD devices. 1-2