MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS - 第60页

MIL-STD-883F MET HOD 1010.8 18 June 2004 4 This page i ntenti onally lef t blank

MIL-STD-883F

METHOD 1010.8

18 June 2004

Figure 1010-1 An example of Temperature Cycling Test Condition C.

MIL-STD-883F

METHOD 1010.8

18 June 2004

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MIL-STD-883F

METHOD 1011.9

27 July 1990

METHOD 1011.9

THERMAL SHOCK

1. PURPOSE

. The purpose of this test is to determine the resistance of the part to sudden exposure to extreme changes

in temperature and the effect of alternate exposures to these extremes.

1.1 Terms and definitions

1.1.1 Cycle

. A cycle consists of starting at ambient room temperature, proceeding to step 1, then to step 2, or alternately

proceeding to step 2, then to step 1, and then back to ambient room temperature without interruption.

1.1.2 Dwell time

. The total time the load is immersed in the bath.

1.1.3 Load

. The devices under test and the fixture holding these devices.

1.1.4 Maximum load

. The maximum mass of devices and fixtures that can be placed in the bath while maintaining

specified temperatures and times.

1.1.5 Specimen

. The device or individual piece being tested.

1.1.6 Transfer time

. The elapsed time measured from removal of the load from one bath until insertion in the other bath.

1.1.7 Worst case load temperature

. The body temperature of a specific device located at the center of the load.

1.1.8 Monitoring sensor

. The temperature sensor that is located and calibrated so as to indicate the same temperature

as at the worst case indicator specimen location. The worst case indicator specimen location is identified during the periodic

characterization of the worst case load temperature.

2. APPARATUS

. The baths used shall be capable of providing and controlling the specified temperatures in the working

zone(s) when the bath is loaded with a maximum load. The thermal capacity and liquid circulation must enable the working

zone and loads to meet the specified conditions and timing (see 3.1). Worst case load temperature shall be continually

monitored during test by indicators or recorders reading the monitoring sensor(s). The worst case load temperature under

maximum load conditions and configuration shall be verified as needed to validate bath performance. Perfluorocarbons that

meet the physical property requirements of table II shall be used for conditions B and C.

3. PROCEDURE

. Specimens shall be placed in the bath in a position so that the flow of liquid across and around them is

substantially unobstructed. The load shall then be subjected to condition B or as otherwise specified (see 4b) of table I for a

duration of 15 cycles. Completion of the total number of cycles specified for the test may be interrupted for the purpose of

loading or unloading of device lots or as the result of power or equipment failure. However, if the number of interruptions for

any given test exceeds 10 percent of the total number of cycles specified, the test must be restarted from the beginning.

3.1 Timing

. The total transfer time from hot to cold or from cold to hot shall not exceed 10 seconds. The load may be

transferred when the worst case load temperature is within the limits specified in table I. However, the dwell time shall be

not less than 2 minutes and the load shall reach the specified temperature within 5 minutes.