TMPR4956C datasheet(28/286 Pages) TOSHIBA

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Handling Precautions

3.3

Design

To achieve the reliability required by an electronic device or system, it is important not only to use the

semiconductor device in accordance with specified absolute maximum ratings and operating ranges, but also to

consider the environment in which the equipment will be used, including factors such as the ambient temperature,

transient noise and current surges, as well as mounting conditions which affect semiconductor device reliability.

This section describes general design precautions. Be sure to refer to the individual ratings of each product at the

time of design.

3.3.1

Absolute Maximum Ratings

The absolute maximum ratings of a semiconductor device are a set of ratings that must not be

exceeded, even for a moment. Do not exceed any of these ratings.

Exceeding the rating(s) may cause device breakdown, damage or deterioration, and may

result injury by explosion or combustion.

If the voltage or current on any pin exceeds the absolute maximum rating, the overvoltage or overcurrent causes

the device’s internal circuitry to deteriorate. In extreme cases, heat generated in

internal circuitry can fuse wiring or cause the semiconductor chip to break down.

If the storage or operating temperature exceeds the absolute maximum rating, the

device internal circuitry may deteriorate and the bonded areas may open or the

package airtightness may deteriorate due to the differences between the thermal

expansion coefficients of the materials from which the device is constructed.

Although absolute maximum ratings differ from product to product, they essentially concern the voltage and

current at each pin, the allowable power dissipation, the connecting area temperatures, and storage temperatures.

Note that the term “maximum rating” which appears in semiconductor technical datasheets and

the like refers to “absolute maximum rating.”

3.3.2

Operating Range

The operating range is the range of conditions necessary for the device to operate as specified in individual

technical datasheets and databooks. Care must be exercised in the design of the equipment. If a device is used

under conditions that do not exceed absolute maximum ratings but exceed the operating range, the specifications

related to device operation and electrical characteristics may not be met, resulting in a decrease in reliability.

If greater reliability is required, derate the device’s operating ranges for voltage, current, power and temperature

before use.

TMPR4956C датащи(PDF) 28 Page - Toshiba Semiconductor