TMP93CS41DF datasheet(28/48 Pages) TOSHIBA

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Quality and Reliability Assurance / Handling Precautions

030901

QUA-28

2002-02-20

4 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.

4.1

From Incoming to Shipping

4.1.1

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.”.

4.1.1.1

Work Environment

(1)

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.

(2)

Be sure that all equipment, jigs and tools in the working area are

grounded to earth.

(3)

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 10

4 to 108

Ω/sq and the resistance between surface and

ground, 7.5

× 105 to 108 Ω.

(4)

Cover the workbench surface also with a conductive mat (with a

surface resistivity of 10

4 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.

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