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Use this section to establish a
level of MCM and /or Hybrid quality and to support an assessment of a facility
when required.
Although the military does not
require the use of ISO 9000, it uses it as its quality standards. ISO 9000 is an international quality standard
used by the majority of MCM/Hybrid manufacturers. ISO 9000 should be used in conjunction with
the performance specification MIL-PRF-38534 in developing and administering a
MCM/Hybrid quality system. Non-military
facilities should have, as a minimum, an ISO 9000 quality system.
The military uses the “Hybrid Microcircuit
Manufacturing Performance Specification” (MIL-PRF-38534) as the standard for
performance, quality and reliability assurance for MCMs/Hybrids. When assessing
a facility, MIL-PRF-38534 should be used as the military performance standard.
This specification will assist in tailoring for critical and complex performance
concerns related specifically to the MCM/Hybrid arena.
MIL-PRF-38534 has five quality assurance levels. Four of
these classes, in highest to lowest order, are K, H, G, and D, as defined below.
The fifth class is Class E, the quality level associated with a Class E device
is defined by the acquisition document.
a. Class K is the highest reliability level. It
is intended for space applications.
b. Class H is the standard-military quality
level. Class H devices are capable of meeting the Class H tests and inspections
of Appendices C and E of MIL-PRF-38534. This includes the incoming inspection
flow, the in-process inspection flow, the screening flow, and the Conformance
Inspection and Periodic Inspection flow. These devices are specified over the
temperature range of -55C to +125C or as specified in the device acquisition
document. Manufacturers of these devices should be fully certified and qualified
in accordance with this specification. Verification of these Performance
Requirements should be performed as described in paragraph 4 of
MIL-PRF-38534.
c. Class G is a less stringent
version of Class H with a QML listing per paragraph 4.5.2.2 of MIL-PRF-38534.
Class G has a narrower temperature range (-40C to +85C), a manufacturer
guaranteed capability to meet the Class H Conformance Inspection and Periodic
Inspection testing, and a vendor specified incoming test flow. The devices must
meet the Class H requirements for In-Process Inspections and Screening. Class G
devices are capable of meeting the Class H tests and inspections of Appendices C
and E of MIL-PRF-38534, except incoming inspection. This includes the In-Process
Inspection flow, the screening flow, and the Conformance Inspection and Periodic
Inspection flow. Compliance with the Conformance Inspection and Periodic
Inspection flow must be guaranteed by the manufacturer. Actual completion of
Conformance Inspection and Periodic Inspection tests and inspections are
optional and at the manufacturer's discretion.
DSCC approval or notification is not required to eliminate Conformance
Inspection and Periodic Inspection tests and inspections for this class of
device; however, it is the manufacturer's responsibility to ensure that their
devices are capable of passing these tests and inspections. These devices are
specified over the temperature range of -40C to +85C or a wider range.
Manufacturers of these devices should be fully certified and QML listed in
accordance with this specification. Verification of these Performance
Requirements should be performed as described in paragraph 4 of
MIL-PRF-38534.
d. Class E designates devices which are based
upon one of the other classes (K, H, or G) with exceptions taken to the
requirements of that class. These exceptions are specified in the device
acquisition document; therefore, the device acquisition document should be
carefully reviewed to ensure that the exceptions taken would not adversely
affect the performance of the system.
Class E devices are devices, which meet all of the requirements of one of
the other classes (K, H, or G), with some exceptions taken. The device acquisition document should
clearly state which class the device is based upon (K, H, or G) and what
exceptions are being taken. The users of
these devices should carefully examine the device acquisition document to verify
that the exceptions being taken will not adversely affect the system
performance. Verification of the performance requirements should be performed as
described in paragraph 4 of MIL-PRF-38534.
e. Class D is a vendor specified quality level.
This is a reduced temperature range (0C to +70C) part with a vendor specified
test flow available from a QML listed manufacturer. Class D devices are built
and tested in accordance with the manufacturer's specified production and
testing flow (see Table I). These devices are capable of meeting the specified
electrical tests. However, these devices are not required to meet any of the
tests and inspections of this specification. These devices are specified over
the temperature range of 0C to +70C or a wider range. Manufacturers of these
devices should be fully certified and QML listed in accordance with this
specification. Verification of these Performance Requirements should be
performed as described in paragraph 4 of
MIL-PRF-38534.