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Guideline for Derating Operational Amplifiers



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This page provides a guide-line for Voltage and Temperature derating of Operational Amplifiers

Op Amp Derating Guidelines:

Op Amp Correction Factor
Parameters
Operational
or
Differential
Amplifiers
Comparators
Sense
Amplifiers
Current
Amplifiers
Voltage
Regulators
Analog
Switches
Absolute maximum
supply voltage
0.80
0.90
0.80
0.80
N/A
0.90
Power dissipation
0.75
0.75
0.75
0.75
0.80
0.80
AC Input Voltage
1.00
1.00
1.00
1.00
N/A
N/A
Output Voltage
1.00
N/A
N/A
1.00
N/A
N/A
Output Voltage
Open Drain
N/A
0.90
0.90
N/A
N/A
N/A
Output Current
AC/DC
0.80
0.80
0.80
0.80
0.80
0.80
Current Max
Short-Circuit
0.90
0.90
0.90
0.90
0.90
N/A
Maximum
Junction Temperature
100oC
100oC
100oC
100oC
100oC
100oC
Manufacturers
Op Amps
Comparators
Op Amps
Op Amps
Regulators
Switches


The table rows provide the different type of operational amplifier configurations, while the columns give the recommended derating from 100 percent of operation.
The term used is Derating Factor or Stress Ration to describe the amount to derate the device parameter.
Note that the amount of derating applies to any temperature of operation, even room temperature.
However, the junction temperature is held to a maximum of 1000C. The numbers provided are recommendations to increase or insure reliable operation.
Increasing Air flow [Manufacturers of Fans] or attaching a Heat sink [Manufacturers of Heat sinks] are two methods
that can be used to increase the operational parameters at high ambient temperatures. Most data sheets use 25oC for device parameters.

Op Amp
Op Amp Equivalent Circuit

Main section, How To Derate Electronic Components, or IC Derating

Most operational parameters are provided for a temperature of 25oC, with a maximum permissible junction temperature.
Normally a 'parameter' per degree C is also provided to indicate how much to reduce a parameter with increasing temperature to keep the junction temperature below the maximum allowable figure.
The table is a general guideline for Op Amps; however, the package style selected will define the absolute operating environment.
Also attaching a heat sink if applicable or applying forced air will greatly reduce the requirement to derate a device, or at least allow the device to operate at a higher temperature.

Main section, How To Derate Electronic Components, or IC Derating

Analog Temperature Sensors:
LM50
SOT-23 Single-Supply Centigrade Temperature Sensor
(+10 mV/°C) and has a DC offset of +500 mV.
LM62
2.7V, 15.6 mV/°C SOT-23 Temperature Sensor
VO = (+15.6 mV/°C x T°C) + 480 mV
LM135A - Precision Temperature Sensor
TO-92, TO-46, 8-pin SOIC

Related section, Op Amp Parasitic Compensation

How to derate operational amplifiers based on temperature, Op Amp Over-Heating, Over Heat Op Amps

Engineering Key words: Component Derating, Derate, Operational Amplifiers, Op Amp, IC, Integrated Circuit, Rated Temp, Temperature, Guide, Guideline, Example, Class, IC, Integrated Circuit.

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Last Modified 8/1/09
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