IPC-TM-650 EN 2022 试验方法.pdf - 第694页

• -40 °C • -55 °C (default) • -65 °C 6.5.1.3 Tolerances The tolerance associated with the hot cycle is +/-5 °C. The tolerance associated with the cold cycle is +/-5 °C. 6.5.1.4 Dwell Time at Extremes During each cycle, t…

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• During the initial cycle after the high temperature dwell. Peak
resistance during this cycle shall be the reference
resistance.
• At or near the end of the peak temperature dwell, after the
coupon has reached temperature stabilization, peak resis-
tance during the cycle shall be recorded.
6.4 Qualification (also see 6.6 and Table 6-2) For quali-
fication testing, the product environment and life expectancy
should be taken into consideration to determine the tempera-
ture extremes and number of cycles. Qualification testing
parameters shall be AABUS.
6.4.1 Historical Examples Historical examples as
described in Table 6-1 were not product focused.
6.4.2 Cycles The test specimen(s) shall be subjected to
the specified number of cycles between the specified tem-
perature extremes.
6.4.2.1 Tolerances The tolerance associated with the hot
cycle is +/-5 °C. The tolerance associated with the cold cycle
is +/-5 °C.
6.4.3 Dwell Time at Extremes During each cycle, the test
specimen(s) shall be subjected to each temperature extreme
for the time required for stabilization and resistance measure-
ment (15 minutes when a dual chamber is used).
6.4.4 Temperature Change Rate The rate of change
between temperature extremes, both high to low and low to
high, shall be as high as possible. The temperature change
shall be at least 10 °C per minute for at least the center 60%
of each transition period, hot to cold and cold to hot.
6.4.5 Temperature Documentation
6.4.5.1
The temperature of a representative test specimen
shall be recorded at the end of the dwell at each temperature
extreme, for every cycle.
6.4.5.2 A temperature profile from at least one complete
cycle shall be recorded during each test in accordance with
5.5.1 and 6.4.2.1 and included in the test report. This shall
include the temperatures of a representative test specimen
and the hot/cold media. Recording data every second for this
purpose is recommended.
6.4.6 Dual Chamber Systems For dual chamber systems:
• The transfer time between chambers shall be less than two
(2) minutes.
• The thermal capacity of each chamber shall be such that
the ambient temperature shall reach the specified tempera-
ture within two (2) minutes after the test specimens have
been transferred to the appropriate chamber.
6.5 Quality Conformance (see also 6.6 and Table 6-2)
6.5.1 Temperature Cycling
The test specimen(s) shall be
subjected to one hundred (100) cycles of temperature cycling
to the extremes defined below:
6.5.1.1 The high temperature extreme shall be the least of
the following:
• Material T
g
1
– 10 °C (lowest T
g
of the materials used in the
specimen, but not lower than 125 °C)
• Reflow peak temperature – 25 °C
• 210 °C
Note 1. The originating subcommittee for this Test Method
was not able to obtain industry consensus on a default
method for determining T
g
. Therefore, methods to determine
T
g
(as specified in the procurement documentation or AABUS)
may include:
• Lowest T
g
listed on the Material Data Sheet
•T
g
(from TMA) listed on the Specification Slash sheet
• Actual T
g
of the material, determined after reflow simulation
6.5.1.2 The low temperature extreme shall be one of the
following:
Table 6-1 Historical Qualification
Temperature Extremes
Cycles
Temperature
Range °C
Test
Condition
1
Previous Use
100 -40 to +85 B
Generic for IPC-4103,
RT/duroid® materials
100 -55 to +105 C
Generic for IPC-4101,
G10 materials
100 -55 to +125 D
Generic for IPC-4101,
Epoxy materials
100 -65 to +150 E
Generic for IPC-4101,
FR-5 materials
100 -65 to +170 F
Generic for IPC-4101,
Polyimide materials
Note 1. Test Conditions B through F are from the previous revision to this
test method.
IPC-TM-650
Number
2.6.7.2
Subject
Thermal Shock, Thermal Cycle and Continuity
Date
3/2020
Revision
C
Page3of5
• -40 °C
• -55 °C (default)
• -65 °C
6.5.1.3 Tolerances The tolerance associated with the hot
cycle is +/-5 °C. The tolerance associated with the cold cycle
is +/-5 °C.
6.5.1.4 Dwell Time at Extremes During each cycle, the
test specimen(s) shall be subjected to each temperature
extreme for the time required for stabilization plus time
required to record all measurements (up to 15 minutes when
a dual chamber is used).
6.5.2 Temperature Change Rate The rate of change
between temperature extremes, both high to low and low to
high, shall be as high as possible. The temperature change
shall be at least 1 °C per second for at least the center 60%
of each transition period, hot to cold and cold to hot. Note
that for thicker coupons greater than 2.5 mm [0.100 in], this
change rate may not be achievable.
6.5.2.1 Temperature Documentation
6.5.2.1.1
The temperature of a representative test speci-
men shall be recorded at the end of the dwell at each tem-
perature extreme, for every cycle.
6.5.2.1.2 A temperature profile from at least one complete
cycle shall be recorded during each test and included in the
test report. This shall include the temperatures of a
representative test specimen and the hot/cold media. The
temperatures shall be taken at sufficient frequency to show
compliance to 5.5.1 and 6.5.1.3. Recording data every sec-
ond for this purpose is recommended.
6.6 Testing Summary
A summary of Qualification and Quality Conformance testing
is listed below in Table 6-2.
6.7 Evaluation
6.7.1 Resistance Change
The change in resistance
between the first and each succeeding temperature cycle
shall be determined. The maximum allowable percent change
in resistance between the first and any subsequent cycle
shall be 5% unless otherwise specified.
6.7.2 Results Test results including cycles to failure, corre-
sponding percent change of the failure, and the percent
change of the final cycle shall be documented.
6.8 Deviations Deviations to the stated requirements or
additional requirements defined here shall be AABUS.
Table 6-2 Comparison of Qualification and Quality Conformance Testing
Item Qualification Quality Conformance / Acceptance Testing
1
Conditioning 6 hours minimum, 105 - 125 °C
Reflow Simulation 6 cycles, 230, 245 or 260 °C profile
Temperature Min AABUS -40 °C, -55 °C (default), -65 °C
Temperature Max AABUS min. of:
T
g
-10 °C
Reflow peak -25 °C
210 °C
Sample Change Rate
> 10 °C/min for both hot and
cold
> 1 °C/sec for both hot and cold
Number of Cycles AABUS 100
Failure Threshold AABUS 5%
Resistance Data 1 reading/cycle near the end of the high temperature dwell
Temperature Data
1 reading/cycle near the end of the high and low temperature dwells (sample)
1 reading/sec through 1 complete cycle (sample and media)
Note 1. Acceptance testing and quality conformance testing as described in IPC-6010 series printed board performance specifications.
IPC-TM-650
Number
2.6.7.2
Subject
Thermal Shock, Thermal Cycle and Continuity
Date
3/2020
Revision
C
Page4of5
7 Notes
7.1
The design of the thermal cycling system must be flex-
ible enough to allow for an extremely high rate of temperature
change and for the rate of temperature change to be deter-
mined. Some issues to consider are as follows:
• Thermal mass compensation capability (energy vs. time)
• Environmental control capability (heating and cooling)
• Reproducibility of parameters
• Transfer speed (if applicable)
• Heating ramp rate
• Cool down rate
• Programming capability
• Profile memory
7.2 Suggested Drawing Note As this method addresses
assembly issues with printed boards, it is recommended that
the user of the printed board establish a drawing note in the
procurement documentation to provide the printed board fab-
ricators with guidance relative to the intended reflow process
of the printed board. An example of such a drawing note is
provided as follows:
XX. IPC D COUPON TESTING
A. COUPONS SHALL INCLUDE COMPONENT (A), VIA (B)
AND ALL PROPAGATED B STRUCTURES IAW IPC-
2221B APPENDIX A. 2 OF EACH COUPON DESIGN
SHALL BE TESTED PER MANUFACTURING PANEL.
B. THE IPC D COUPONS SHALL BE SUBJECTED TO 6
REFLOW SIMULATIONS IAW IPC-TM-650, METHOD
2.6.27 USING THE [230 °C, OR 245 °C, OR 260 °C]
PROFILE. ACCEPTANCE CRITERIA SHALL BE<5%
CHANGE IN RESISTANCE.
C. AFTER REFLOW SIMULATION TESTING, THE IPC D
COUPONS SHALL BE SUBJECTED TO 100 THERMAL
SHOCKS IAW IPC-TM-650, METHOD 2.6.7.2 FROM
-55C TO [MINIMUM OF (LAMINATE T
G
–10°C), OR
(REFLOW PEAK TEMPERATURE – 25 °C), OR
210 °C]. ACCEPTANCE CRITERIA SHALL BE<5%
CHANGE IN RESISTANCE.
Note: Parameters in bold should be tailored to each
application.
IPC-TM-650
Number
2.6.7.2
Subject
Thermal Shock, Thermal Cycle and Continuity
Date
3/2020
Revision
C
Page5of5