TMPR4937 datasheet(24/552 Pages) TOSHIBA

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3 General Safety Precautions and Usage Considerations

3-2

(e) Make sure that sections of the tape carrier which come into contact with installation devices or other

electrical machinery are made of a low-resistance material.

(f) Make sure that jigs and tools used in the assembly process do not touch devices.

(g) In processes in which packages may retain an electrostatic charge, use an ionizer to neutralize the ions.

• Make sure that CRT displays in the working area are protected against static charge, for example by a VDT

filter. As much as possible, avoid turning displays on and off. Doing so can cause electrostatic induction in

devices.

• Keep track of charged potential in the working area by taking periodic measurements.

• Ensure that work chairs are protected by an anti-static textile cover and are grounded to the floor surface by a

grounding chain. (Suggested resistance between the seat surface and grounding chain is 7.5

× 105 to 1012Ω.)

• Install anti-static mats on storage shelf surfaces. (Suggested surface resistivity is 104 to 108 Ω/sq; suggested

resistance between surface and ground is 7.5 × 105 to 108 Ω.)

• For transport and temporary storage of devices, use containers (boxes, jigs or bags) that are made of anti-static

materials or materials which dissipate electrostatic charge.

• Make sure that cart surfaces which come into contact with device packaging are made of materials which will

conduct static electricity, and verify that they are grounded to the floor surface via a grounding chain.

• In any location where the level of static electricity is to be closely controlled, the ground resistance level

should be Class 3 or above. Use different ground wires for all items of equipment which may come into

physical contact with devices.

(2) Operating environment

• Operators must wear anti-static clothing and conductive shoes (or a leg or

heel strap).

• Operators must wear a wrist strap grounded to earth via a resistor of about

1 M

Ω.

• Soldering irons must be grounded from iron tip to earth, and must be used only at low voltages (6 V to 24 V).

• If the tweezers you use are likely to touch the device terminals, use anti-static tweezers and in particular avoid

metallic tweezers. If a charged device touches a low-resistance tool, rapid discharge can occur. When using

vacuum tweezers, attach a conductive chucking pat to the tip, and connect it to a dedicated ground used

especially for anti-static purposes (suggested resistance value: 104 to 108 Ω).

• Do not place devices or their containers near sources of strong electrical fields (such as above a CRT).

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