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MIL-STD-1389 Revision D, March 30, 1989
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DESIGN REQUIREMENTS FOR STANDARD ELECTRONIC MODULES
Includes all amendments and changes through Notice 1, April 22, 1998
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This standard establishes the design requirements for Standard Electronic Modules (SEM) for the Standard Hardware Acquisition and Reliability Program (SHARP) for use in military systems. Other requirements for new module development are specified in MIL-M-28787 for the appropriate class selected to meet the system/equipment environmental requirements.

SEM shall be of the following classes and formats as specified in the detail specifications:
       Classes

          Class I   -   For primary utilization in shipboard, subsurface
                        ship, and shore applications.  Module interface
                        temperature, rib surfaces or inlet air, at 0°C low,
                        and 60°C high.

          Class II  -   For primary utilization in airborne applications
                        and where stringent environmental requirements are
                        imposed.  Module interface temperature, rib
                        surfaces or inlet air, at minus 55°C low, and 85°C
                        high.

          Class III -   For utilization where class I modules may be
                        exposed to radiation.  Module interface
                        temperature, rib surfaces or inlet air, at 0°C low,
                        and 60°C high.

          Class IV  -   For utilization where class II modules may be
                        exposed to radiation.  Module interface
                        temperature, rib surfaces or inlet air, at minus
                        55°C low, and 85°C high.

Formats

          Format A  -   The basic size has a span of 2.62 inches (66.55 mm),
                        a thickness of 0.290 inches (7.377 mm), and a total
                        height of 1.95 inches (49.53 mm) including keying
                        pins.

          Format B  -   The basic size has a span of 2.74 inches (69.59
                        mm), a thickness of 0.290 inches (7.377 mm), and a
                        total height of 1.95 inches (49.53 mm) including
                        keying pins.

          Format C  -   The basic size has a span of 5.88 inches (149.35
                        mm), a thickness of 0.280 inches (7.112 mm), and a
                        total height of 4.06 inches (103.12 mm) including
                        keying pins.

          Format D  -   The basic size has a span of 5.88 inches (149.35
                        mm), a thickness of 0.280 inches (7.112 mm), and a
                        total height of 4.83 inches (122.68 mm), including
                        keying pins.

          Format E  -   The basic size has a span of 5.88 inches (149.35
                        mm), a thickness of 0.380 inches (9.652 mm), and a
                        total height of 6.68 inches (169.67 mm), including
                        keying pins.