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Shown in the figure is a multicycle fatigue tester for assessment of electrical connections, such as the C4 type.
English (United States)
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Multicycle C4 Fatigue Tester
Shown in the figure is a multicycle fatigue tester for assessment of electrical
connections, such as the C4 type.
The tester comprises a monocular microscope 1 mounted above a torque
transducer 2. Within a clam-shell heater assembly 3, the chip and substrate 4, of
which the C4 connections between them are to be tested, are mounted on an X-
Y stage 5. This stage is driven by a torque motor 6 with a servo valve 7 and a
The blocks describe the control of the tester and collection of data for each
chip and substrate tested to determine the number of cycles, under
predetermined conditions, the C4 connections will withstand by monitoring either
the decrease in shear stress or an increase in electrical resistance.
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