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Discrete Semiconductors are typically
application-specific and though not considered state-of-the-art, they are
critical in military applications. Since they rely on power dissipation a great
deal, their construction, rating, and reliability are critical elements in their performance.
This section describes quality, reliability and
rating requirements for Discrete Semiconductors with detailed recommendations.
This information is provided to assist in choosing between standard military
(QML-19500), tailored application specific, or commercial item parts.
MIL-HDBK-5961 lists Standard Discrete Semiconductors.
Detailed performance requirements are in MIL-PRF-19500, and listed in QML-19500
are qualified parts/manufacturers. MIL-HDBK-6100 details the dimensions for many
of the standard case outlines used for Discrete Semiconductors.
The military no longer requires equipment
manufacturers to use military-only parts. It is highly recommended to use
QML-19500 manufacturers and JANTX level parts, as a minimum.
This section discusses both Silicon and Gallium
Arsenide discrete semiconductors.
Optoelectronic Semiconductors are briefly described
in this section. The section on Optoelectronic's addresses them in more
manufacturers and parts. The military Discrete Semiconductor industry is mature
and knowledgeable in many different applications. Recommend using them in all
environments to keep risk to a minimum.
Use MIL-PRF-19500 to
define performance requirements.
For applications that
the part’s temperature will be greater than 60° C, require a thermal resistance limit and thermal
impedance limit and monitoring.