TMP93CS40DF datasheet(35/48 Pages) TOSHIBA

35 / 48 page

Quality and Reliability Assurance / Handling Precautions

030901

QUA-35

2002-02-20

4.3

Design

Care must be exercised in the design of electronic equipment to achieve the desired

reliability. It is important not only to adhere to specifications concerning absolute

maximum ratings and recommended operating conditions, it is also important to

consider the overall environment in which equipment will be used, including factors

such as the ambient temperature, transient noise and voltage and current surges,

as well as mounting conditions which affect device reliability. This section describes

some general precautions which you should observe when designing circuits and

when mounting devices on printed circuit boards.

For more detailed information about each product family, refer to the relevant

individual technical datasheets available from Toshiba.

4.3.1

Absolute Maximum Ratings

Do not use devices under conditions in which their absolute maximum

ratings (e.g. current, voltage, power dissipation or temperature) will

be exceeded. A device may break down or its performance may be

degraded, causing it to catch fire or explode resulting in injury to the

user.

The absolute maximum ratings are rated values which

must not be exceeded during operation, even for an instant.

Although absolute maximum ratings differ from product to

product, they essentially concern the voltage and current

at each pin, the allowable power dissipation, and the

junction and storage temperatures.

If the voltage or current on any pin exceeds the absolute

maximum rating, the device’s internal circuitry can become degraded. In the

worst case, heat generated in internal circuitry can fuse wiring or cause the

semiconductor chip to break down.

If storage or operating temperatures exceed rated values, the package seal can

deteriorate or the wires can become disconnected due to the differences

between the thermal expansion coefficients of the materials from which the

device is constructed.

4.3.2

Recommended Operating Conditions

The recommended operating conditions for each device are those necessary to

guarantee that the device will operate as specified in the datasheet.

If greater reliability is required, derate the device’s absolute maximum ratings

for voltage, current, power and temperature before using it.

4.3.3

Derating

When incorporating a device into your design, reduce its rated absolute

maximum voltage, current, power dissipation and operating temperature in

order to ensure high reliability.

Since derating differs from application to application, refer to the technical

datasheets available for the various devices used in your design.

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