TMP91C829F Просмотр технического описания (PDF) - Toshiba

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Quality And Reliability Assurance / Handling Precautions

Toshiba 

Quality and Reliability Assurance / Handling Precautions

4.6.3

Corrosive Gases

Corrosive gases can cause chemical reactions in devices, degrading device

characteristics.

For example, sulphur-bearing corrosive gases emanating from rubber placed

near a device (accompanied by condensation under high-humidity conditions)

can corrode a device’s leads. The resulting chemical reaction between leads

forms foreign particles which can cause electrical leakage.

4.6.4

Radioactive and Cosmic Rays

Most industrial and consumer semiconductor devices are not designed with

protection against radioactive and cosmic rays. Devices used in aerospace

equipment or in radioactive environments must therefore be shielded.

4.6.5

Strong Electrical and Magnetic Fields

Devices exposed to strong magnetic fields can undergo a polarization

phenomenon in their plastic material, or within the chip, which gives rise to

abnormal symptoms such as impedance changes or increased leakage current.

Failures have been reported in LSIs mounted near malfunctioning deflection

yokes in TV sets. In such cases, the device’s installation location must be

changed or the device must be shielded against the electrical or magnetic field.

Shielding against magnetism is especially necessary for devices used in an

alternating magnetic field because of the electromotive forces generated in this

type of environment.

4.6.6

Interference from Light (ultraviolet rays, sunlight, fluorescent

lamps and incandescent lamps)

Light striking a semiconductor device generates electromotive force due to

photoelectric effects. In some cases the device can malfunction. This is

especially true for devices in which the internal chip is exposed. When

designing circuits, make sure that devices are protected against incident light

from external sources. This problem is not limited to optical semiconductors

and EPROMs. All types of device can be affected by light.

4.6.7

Dust and Oil

Just like corrosive gases, dust and oil can cause chemical reactions in devices,

which will adversely affect a device’s electrical characteristics. To avoid this

problem, do not use devices in dusty or oily environments. This is especially

important for optical devices because dust and oil can affect a device’s optical

characteristics as well as its physical integrity and the electrical performance

factors mentioned above.

4.6.8 Fire

Semiconductor devices are combustible; they can emit smoke and catch fire if

heated sufficiently. When this happens, some devices may generate poisonous

gases. Devices should therefore never be used in close proximity to an open

flame or a heat-generating body, or near flammable or combustible materials.

030901

QUA-46

2002-02-20

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