TMPR4955AF datasheet(21/168 Pages) TOSHIBA

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General Safety Precautions and Usage Considerations

3-1

General Safety Precautions and Usage Considerations

This section is designed to help you gain a better understanding of semiconductor devices, so as to

ensure the safety, quality and reliability of the devices which you incorporate into your designs.

3.1

From Incoming to Shipping

3.1.1

Electrostatic discharge (ESD)

When handling individual devices (which are not yet mounted on a printed

circuit board), be sure that the environment is protected against

electrostatic electricity. Operators should wear anti-static clothing, and

containers and other objects which come into direct contact with devices

should be made of anti-static materials and should be grounded to earth via

an 0.5- to 1.0-M

Ω protective resistor.

Please follow the precautions described below; this is particularly important

for devices which are marked “Be careful of static.”.

(1) Work environment

• When humidity in the working environment decreases, the human body and other insulators

can easily become charged with static electricity due to friction. Maintain the recommended

humidity of 40% to 60% in the work environment, while also taking into account the fact that

moisture-proof-packed products may absorb moisture after unpacking.

• Be sure that all equipment, jigs and tools in the working area are grounded to earth.

• Place a conductive mat over the floor of the work area, or take other appropriate measures, so

that the floor surface is protected against static electricity and is grounded to earth. The surface

resistivity should be 104 to 108

Ω/sq and the resistance between surface and ground, 7.5 × 105 to

108

Ω

• Cover the workbench surface also with a conductive mat (with a surface resistivity of 104 to

108

Ω/sq, for a resistance between surface and ground of 7.5 × 105 to 108 Ω) . The purpose of this

is to disperse static electricity on the surface (through resistive components) and ground it to

earth. Workbench surfaces must not be constructed of low-resistance metallic materials that

allow rapid static discharge when a charged device touches them directly.

• Pay attention to the following points when using automatic equipment in your workplace:

(a) When picking up ICs with a vacuum unit, use a conductive rubber fitting on the end of the

pick-up wand to protect against electrostatic charge.

(b) Minimize friction on IC package surfaces. If some rubbing is unavoidable due to the device’s

mechanical structure, minimize the friction plane or use material with a small friction

coefficient and low electrical resistance. Also, consider the use of an ionizer.

dissipates static electricity.

(d) Ensure that no statically charged bodies (such as work clothes or the human body) touch

the devices.

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