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Operating temperature

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An operating temperature is the allowable <a href="Temperature" title="Temperature">temperature</a> range of the local ambient environment at which an electrical or mechanical device operates. The device will operate effectively within a specified temperature range which varies on the basis of the device's function and application context, and ranges from the minimum operating temperature to the maximum operating temperature (or peak operating temperature). Outside this range of safe operating temperatures the device may fail.

It is one component of <a href="Reliability_engineering" title="Reliability engineering">reliability engineering</a>.

Similarly, biological systems remain viable in a temperature range that equates to an operating temperature.

<div class="mw-heading mw-heading2"><h2 id="Ranges">Ranges</h2></div>

Most semiconductor devices are manufactured in several temperature grades. Broadly accepted grades<a href="#cite_note-1">[1]</a> are:

<ul><li>Commercial: 0 °C to 70 °C (32 to 158 °F)</li>

<li>Industrial: −40 °C to 85 °C (−40 to 185 °F)</li>

<li>Military: −55 °C to 125 °C (−67 to 257 °F)</li></ul>

Nevertheless, each manufacturer defines its own temperature grades so designers must pay attention to <a href="Datasheet" title="Datasheet">datasheet</a> specifications. For example, <a href="Maxim_Integrated" title="Maxim Integrated">Maxim Integrated</a> uses five temperature grades for its products:<a href="#cite_note-2">[2]</a>

<ul><li>Full Military: −55 °C to 125 °C (−67 to 257 °F)</li>

<li>Automotive: −25 °C to 125 °C (−13 to 257 °F)</li>

<li>AEC-Q100 Level 2: −40 °C to 105 °C (−40 to 221 °F)</li>

<li>Extended Industrial: −40 °C to 85 °C (−40 to 185 °F)</li>

<li>Industrial: −20 °C to 85 °C (−4 to 185 °F)</li></ul>

The use of such grades ensures that a device is suitable for its application, and will withstand the environmental conditions in which it is used. Normal operating temperature ranges are affected by several factors, such as the power dissipation of the device.<a href="#cite_note-FOOTNOTEAnalog_Devices-3">[3]</a> These factors are used to define a "threshold temperature" of a device, i.e. its maximum normal operating temperature, and a maximum operating temperature beyond which the device will no longer function. Between these two temperatures, the device will operate at a non-peak level.<a href="#cite_note-FOOTNOTEAnalog_DevicesPower_dissipation-4">[4]</a> For instance, a <a href="Resistor" title="Resistor">resistor</a> may have a threshold temperature of 70 °C (158 °F) and a maximum temperature of 155 °C (311 °F), between which it exhibits a thermal <a href="Derating" title="Derating">derating</a>.<a href="#cite_note-FOOTNOTEAnalog_Devices-3">[3]</a>

For electrical devices, the temperature of the <a href="Semiconductor" title="Semiconductor">semiconductor</a> in the device, known as <a href="Junction_temperature" title="Junction temperature">junction temperature</a>, is affected by the ambient temperature, and for <a href="Integrated_circuit" title="Integrated circuit">integrated circuits</a> is given by the equation:<a href="#cite_note-FOOTNOTEVassighiSachdev200632-5">[5]</a>

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<annotation encoding="application/x-tex">{\displaystyle T_{J}=T_{a}+P_{D}\times R_{ja}}</annotation>

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</math><img src="./fa657ba59c1feebea29adb0f174c6dab249ad36d.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:20.497ex; height:2.843ex;" alt="{\displaystyle T_{J}=T_{a}+P_{D}\times R_{ja}}" loading="lazy"></dd></dl>

in which TJ is the junction temperature in °C, Ta is the ambient temperature in °C, PD is the power dissipation of the integrated circuit in <a href="Watt" title="Watt">W</a>, and Rja is the junction to ambient <a href="Thermal_resistance" class="mw-redirect" title="Thermal resistance">thermal resistance</a> in °C/W.

<div class="mw-heading mw-heading2"><h2 id="Aerospace_and_military">Aerospace and military</h2></div>

Electrical and mechanical devices used in military and aerospace applications may need to endure greater environmental variability, including temperature range.

In the <a href="United_States_Department_of_Defense" title="United States Department of Defense">United States Department of Defense</a> has defined the <a href="United_States_Military_Standard" title="United States Military Standard">United States Military Standard</a> for all products used by the United States Armed Forces. A product's environmental design and test limits to the conditions that it will undergo throughout its service life are specified in <a href="MIL-STD-810" title="MIL-STD-810">MIL-STD-810</a>, the Department of Defense Test Method Standard for Environmental Engineering Considerations and Laboratory Tests.<a href="#cite_note-FOOTNOTEUnited_States_Department_of_Defense-6">[6]</a>

The MIL-STD-810G standard specifies that the "operating temperature stabilization is attained when the temperature of the functioning part(s) of the test item considered to have the longest thermal lag is changing at a rate of no more than 2.0 °C (3.6 °F) per hour."<a href="#cite_note-FOOTNOTEUnited_States_Department_of_Defense-6">[6]</a> It also specifies procedures to assess the performance of materials to extreme <a href="Structural_load#Environmental_loads" title="Structural load">temperature loads</a>.<a href="#cite_note-FOOTNOTEUnited_States_Department_of_Defensesection_2.1.1-7">[7]</a>

Military engine turbine blades experience two significant deformation stresses during normal service, <a href="Creep_(deformation)" title="Creep (deformation)">creep</a> and <a href="Fatigue_(material)" title="Fatigue (material)">thermal fatigue</a>.<a href="#cite_note-FOOTNOTEBrancoRitchieSklenička1996-8">[8]</a> Creep life of a material is "highly dependent on operating temperature",<a href="#cite_note-FOOTNOTEBrancoRitchieSklenička1996-8">[8]</a> and creep analysis is thus an important part of design validation. Some of the effects of creep and thermal fatigue may be mitigated by integrating cooling systems into the device's design, reducing the peak temperature experienced by the metal.<a href="#cite_note-FOOTNOTEBrancoRitchieSklenička1996-8">[8]</a>

<div class="mw-heading mw-heading2"><h2 id="Commercial_and_retail">Commercial and retail</h2></div>

Commercial and retail products are manufactured to less stringent requirements than those for military and aerospace applications. For example, <a href="Microprocessor" title="Microprocessor">microprocessors</a> produced by <a href="Intel_Corporation" class="mw-redirect" title="Intel Corporation">Intel Corporation</a> are manufactured to three grades: commercial, industrial and extended.<a href="#cite_note-FOOTNOTEPentium_Processor_Packing_Identification_Codes-9">[9]</a>

Because some devices generate heat during operation, they may require <a href="Thermal_management_of_electronic_devices_and_systems" class="mw-redirect" title="Thermal management of electronic devices and systems">thermal management</a> to ensure they are within their specified operating temperature range; specifically, that they are operating at or below the maximum operating temperature of the device.<a href="#cite_note-FOOTNOTEIntel_Corporation-10">[10]</a> <a href="Computer_cooling" title="Computer cooling">Cooling</a> a microprocessor mounted in a typical commercial or retail configuration requires "a heatsink properly mounted to the processor, and effective airflow through the system chassis".<a href="#cite_note-FOOTNOTEIntel_Corporation-10">[10]</a> Systems are designed to protect the processor from unusual operating conditions, such as "higher than normal ambient air temperatures or failure of a system thermal management component (such as a system fan)",<a href="#cite_note-FOOTNOTEIntel_Corporation-10">[10]</a> though in "a properly designed system, this feature should never become active".<a href="#cite_note-FOOTNOTEIntel_Corporation-10">[10]</a> Cooling and other thermal management techniques may affect performance and noise level.<a href="#cite_note-FOOTNOTEIntel_Corporation-10">[10]</a> <a href="Noise_mitigation" class="mw-redirect" title="Noise mitigation">Noise mitigation</a> strategies may be required in residential applications to ensure that the noise level does not become uncomfortable.

Battery service life and efficacy is affected by operating temperature.<a href="#cite_note-FOOTNOTECrompton2000-11">[11]</a> Efficacy is determined by comparing the service life achieved by the battery as a percentage of its service life achieved at 20 °C (68 °F) versus temperature. <a href="Electrical_resistance" class="mw-redirect" title="Electrical resistance">Ohmic load</a> and operating temperature often jointly determine a battery's discharge rate.<a href="#cite_note-FOOTNOTECrompton2000figure_30.33-12">[12]</a> Moreover, if the expected operating temperature for a <a href="Primary_cell" class="mw-redirect" title="Primary cell">primary battery</a> deviates from the typical 10 °C to 25 °C (50 to 77 °F) range, then operating temperature "will often have an influence on the type of battery selected for the application".<a href="#cite_note-FOOTNOTECrompton20002/5section_2.1-13">[13]</a> Energy reclamation from partially depleted <a href="Lithium_battery" title="Lithium battery">lithium sulfur dioxide battery</a> has been shown to improve when "appropriately increasing the battery operating temperature".<a href="#cite_note-FOOTNOTEDougalGaoJiang2005-14">[14]</a>

<div class="mw-heading mw-heading2"><h2 id="Biology">Biology</h2></div>

Mammals attempt to maintain a comfortable body temperature under various conditions by <a href="Thermoregulation" title="Thermoregulation">thermoregulation</a>, part of mammalian <a href="Homeostasis" title="Homeostasis">homeostasis</a>. The lowest normal temperature of a mammal, the <a href="Basal_body_temperature" title="Basal body temperature">basal body temperature</a>, is achieved during sleep. In women, it is affected by ovulation, causing a biphasic pattern which may be used as a component of <a href="Fertility_awareness" title="Fertility awareness">fertility awareness</a>.

In humans, the <a href="Hypothalamus" title="Hypothalamus">hypothalamus</a> regulates <a href="Metabolism" title="Metabolism">metabolism</a>, and hence the <a href="Basal_metabolic_rate" title="Basal metabolic rate">basal metabolic rate</a>. Amongst its functions is the regulation of body temperature. The core body temperature is also one of the classic phase markers for measuring the timing of an individual's <a href="Circadian_rhythm" title="Circadian rhythm">Circadian rhythm</a>.<a href="#cite_note-FOOTNOTEBenloucifGuicoReidWolfe2005-15">[15]</a>

Changes to the normal <a href="Human_body_temperature" title="Human body temperature">human body temperature</a> may result in discomfort. The most common such change is a <a href="Fever" title="Fever">fever</a>, a temporary elevation of the body's thermoregulatory set-point, typically by about 1–2 °C (1.8–3.6 °F). <a href="Hyperthermia" title="Hyperthermia">Hyperthermia</a> is an acute condition caused by the body absorbing more heat than it can dissipate, whereas <a href="Hypothermia" title="Hypothermia">hypothermia</a> is a condition in which the body's core temperature drops below that required for normal metabolism, and which is caused by the body's inability to replenish the heat that is being lost to the environment.<a href="#cite_note-FOOTNOTEMarx20101870-16">[16]</a>

<div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20200602211114/https://www.cactus-tech.com/wp-content/uploads/2019/03/Commercial-and-Industrial-Grade-Products.pdf">"Cactus Techonlogies - Commercial and Industrial Grade Flash Storage Markets"</a> (PDF). Archived from <a rel="nofollow" class="external text" href="https://www.cactus-tech.com/wp-content/uploads/2019/03/Commercial-and-Industrial-Grade-Products.pdf">the original</a> (PDF) on 2020-06-02.</cite>

</li>

<li id="cite_note-2"><a href="#cite_ref-2">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.maximintegrated.com/en/markets/military-aerospace.html">"Aerospace & Defense Semiconductors | Maxim Integrated"</a>.</cite>

</li>

<li id="cite_note-FOOTNOTEAnalog_Devices-3">^ <a href="#cite_ref-FOOTNOTEAnalog_Devices_3-0">a</a> <a href="#cite_ref-FOOTNOTEAnalog_Devices_3-1">b</a> <a href="#CITEREFAnalog_Devices">Analog Devices</a>.

</li>

<li id="cite_note-FOOTNOTEAnalog_DevicesPower_dissipation-4"><a href="#cite_ref-FOOTNOTEAnalog_DevicesPower_dissipation_4-0">^</a> <a href="#CITEREFAnalog_Devices">Analog Devices</a>, Power dissipation.

</li>

<li id="cite_note-FOOTNOTEVassighiSachdev200632-5"><a href="#cite_ref-FOOTNOTEVassighiSachdev200632_5-0">^</a> <a href="#CITEREFVassighiSachdev2006">Vassighi & Sachdev 2006</a>, p. 32.

</li>

<li id="cite_note-FOOTNOTEUnited_States_Department_of_Defense-6">^ <a href="#cite_ref-FOOTNOTEUnited_States_Department_of_Defense_6-0">a</a> <a href="#cite_ref-FOOTNOTEUnited_States_Department_of_Defense_6-1">b</a> <a href="#CITEREFUnited_States_Department_of_Defense">United States Department of Defense</a>.

</li>

<li id="cite_note-FOOTNOTEUnited_States_Department_of_Defensesection_2.1.1-7"><a href="#cite_ref-FOOTNOTEUnited_States_Department_of_Defensesection_2.1.1_7-0">^</a> <a href="#CITEREFUnited_States_Department_of_Defense">United States Department of Defense</a>, section 2.1.1.

</li>

<li id="cite_note-FOOTNOTEBrancoRitchieSklenička1996-8">^ <a href="#cite_ref-FOOTNOTEBrancoRitchieSklenička1996_8-0">a</a> <a href="#cite_ref-FOOTNOTEBrancoRitchieSklenička1996_8-1">b</a> <a href="#cite_ref-FOOTNOTEBrancoRitchieSklenička1996_8-2">c</a> <a href="#CITEREFBrancoRitchieSklenička1996">Branco, Ritchie & Sklenička 1996</a>.

</li>

<li id="cite_note-FOOTNOTEPentium_Processor_Packing_Identification_Codes-9"><a href="#cite_ref-FOOTNOTEPentium_Processor_Packing_Identification_Codes_9-0">^</a> <a href="#CITEREFPentium_Processor_Packing_Identification_Codes">Pentium Processor Packing Identification Codes</a>Intel's packaging indicates the processors operating temperature range by denoting it with a grade: 'Q' (commercial grade), 'I' (industrial grade), and 'L' or 'T' (extended grade). It also has an automotive grade 'A'

</li>

<li id="cite_note-FOOTNOTEIntel_Corporation-10">^ <a href="#cite_ref-FOOTNOTEIntel_Corporation_10-0">a</a> <a href="#cite_ref-FOOTNOTEIntel_Corporation_10-1">b</a> <a href="#cite_ref-FOOTNOTEIntel_Corporation_10-2">c</a> <a href="#cite_ref-FOOTNOTEIntel_Corporation_10-3">d</a> <a href="#cite_ref-FOOTNOTEIntel_Corporation_10-4">e</a> <a href="#CITEREFIntel_Corporation">Intel Corporation</a>.

</li>

<li id="cite_note-FOOTNOTECrompton2000-11"><a href="#cite_ref-FOOTNOTECrompton2000_11-0">^</a> <a href="#CITEREFCrompton2000">Crompton 2000</a>.

</li>

<li id="cite_note-FOOTNOTECrompton2000figure_30.33-12"><a href="#cite_ref-FOOTNOTECrompton2000figure_30.33_12-0">^</a> <a href="#CITEREFCrompton2000">Crompton 2000</a>, p. figure 30.33.

</li>

<li id="cite_note-FOOTNOTECrompton20002/5section_2.1-13"><a href="#cite_ref-FOOTNOTECrompton20002/5section_2.1_13-0">^</a> <a href="#CITEREFCrompton2000">Crompton 2000</a>, p. 2/5, section 2.1.

</li>

<li id="cite_note-FOOTNOTEDougalGaoJiang2005-14"><a href="#cite_ref-FOOTNOTEDougalGaoJiang2005_14-0">^</a> <a href="#CITEREFDougalGaoJiang2005">Dougal, Gao & Jiang 2005</a>.

</li>

<li id="cite_note-FOOTNOTEBenloucifGuicoReidWolfe2005-15"><a href="#cite_ref-FOOTNOTEBenloucifGuicoReidWolfe2005_15-0">^</a> <a href="#CITEREFBenloucifGuicoReidWolfe2005">Benloucif et al. 2005</a>.

</li>

<li id="cite_note-FOOTNOTEMarx20101870-16"><a href="#cite_ref-FOOTNOTEMarx20101870_16-0">^</a> <a href="#CITEREFMarx2010">Marx 2010</a>, p. 1870.

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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<ul><li><cite id="CITEREFBenloucifGuicoReidWolfe2005" class="citation journal cs1">Benloucif, S.; Guico, M.J.; Reid, K.J.; Wolfe, L.F.; L'Hermite-Baleriaux, M.; Zee, P.C. (2005). "Stability of Melatonin and Temperature as Circadian Phase Markers and Their Relation to Sleep Times in Humans". Journal of Biological Rhythms. 20 (2). SAGE Publications: 178–188. <a href="CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.851.1161">10.1.1.851.1161</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1177%2F0748730404273983">10.1177/0748730404273983</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0748-7304">0748-7304</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15834114">15834114</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:36360463">36360463</a>.</cite></li>

<li><cite id="CITEREFBrancoRitchieSklenička1996" class="citation book cs1">Branco, Carlos Moura; Ritchie, Robert O.; Sklenička, Václav (1996). Mechanical behaviour of materials at high temperature. Springer. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-7923-4113-0</bdi>.</cite></li>

<li><cite id="CITEREFCrompton2000" class="citation book cs1">Crompton, Thomas Roy (2000). "Effects of operating temperature on service life". Battery reference book. Newnes. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-7506-4625-3</bdi>.</cite></li>

<li><cite id="CITEREFDougalGaoJiang2005" class="citation journal cs1">Dougal, Robert A.; Gao, Lijun; Jiang, Zhenhua (2 February 2005). "Effectiveness analysis of energy reclamation from partially depleted batteries". Journal of Power Sources. 140 (2). Elsevier B.V.: 409–415. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2005JPS...140..409D">2005JPS...140..409D</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.jpowsour.2004.08.037">10.1016/j.jpowsour.2004.08.037</a>.</cite></li>

<li><cite id="CITEREFMarx2010" class="citation book cs1">Marx, John (2010). Rosen's emergency medicine: concepts and clinical practice (7th ed.). Philadelphia, PA: Mosby/Elsevier. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-323-05472-0</bdi>.</cite></li>

<li><cite id="CITEREFTurner2009" class="citation book cs1">Turner, Martin J. L. (2009). Rocket and Spacecraft Propulsion: Principles, Practice and New Developments. Springer Praxis Books / Astronautical Engineering. Springer. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-3-540-69202-7</bdi>. <a href="OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/475771458">475771458</a>.</cite></li>

<li><cite id="CITEREFVassighiSachdev2006" class="citation book cs1">Vassighi, Arman; Sachdev, Manoj (2006). Thermal and Power Management of Integrated Circuits. Integrated Circuits and Systems. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9780387257624</bdi>.</cite></li>

<li><cite id="CITEREFAltera_Corporation" class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.altera.com/devices/common/ind/ind-temp.html#table1">"Enhanced temperature device support"</a>. <a href="Altera" title="Altera">Altera</a> Corporation. Retrieved 2014-02-27.</cite></li>

<li><cite id="CITEREFAnalog_Devices" class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.analog.com/static/imported-files/rarely_asked_questions/moreInfo_raq_resistors.html">"Resistors in Analog Circuitry"</a>. <a href="Analog_Devices" title="Analog Devices">Analog Devices</a>. Retrieved 2014-02-27.</cite></li>

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