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Data updated: 12 Mar 2026.
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Document ID:
MIL-HDBK-251
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Overview
Title:
Reliability/Design Thermal Applications
Scope:
This handbook recommends and presents electronic parts stress analysis methods which lead to the selection of maximum safe temperatures for parts so that the ensuing thermal design is consistent with the required equipment reliability. These maximum parts temperature must be properly selected since they are the goals of the thermal design, a fact which is often overlooked. Many thermal designs are inadequate because improper maximum parts temperature were selected as design goals. Consequently, the necessary parts stress analysis procedures have been emphasized. Specific step by step thermal design procedures are given in chapter 4.
Status:
Active
Document Date:
23-FEB-2026
Next Review Due:
21-FEB-2036
FSC/Area:
SESS
Doc Category:
Defense Handbook
Responsibilities
Lead Standardization Activity:
SE
Director, Systems Engineering
Preparing Activity:
SH
Naval Sea Systems Command (Ship Systems)
Coordination:
Full
Army Custodian:
CR
US Army Combat Capabilities Development Command, C5ISR Center
Navy Custodian:
SH
Naval Sea Systems Command (Ship Systems)
Air Force Custodian:
11
Air Force Life Cycle Management Center - Aircraft Systems
Changes to military standards or handbooks issued after August 1, 2003 are incorporated in the modified document.
Revision History
Click on column headings for a description of column content.
Media
Document Part Description
Dist Stmt
Document Date
Pages
Size
Notice 2 - Validation
A
23-FEB-2026
1
1.9 KB
Notice 1 - Validation
A
19-JAN-2021
1
1.9 KB
Base Document
A
19-JAN-1978
697
55186.6 KB
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WARNING: UNAUTHORIZED ACCESS TO THIS UNITED STATES GOVERNMENT COMPUTER SYSTEM AND SOFTWARE IS PROHIBITED BY PUBLIC LAW 99-474 (THE COMPUTER FRAUD AND ABUSE ACT OF 1986) AND CAN RESULT IN ADMINISTRATIVE, DISCIPLINARY OR CRIMINAL PROCEEDINGS.