东芝电子可靠性测试(19)

东芝电子可靠性测试

[ 3 ] Reliability Testing

This equation expresses the relationship between temperature and lifetime. If the failure mechanism is uniform, lnL and 1/T can be plotted on a straight line as shown in Figure 2.3. That is, the acceleration from temperature T1 to T2 is lnL1/lnL2.

lnL2Lifetime lnL1

1/T11/T2

Temperature

(K)

Figure 2.3 Relationship between Lifetime and Temperature

Given acceleration coefficient α and the lifetimetimes L1 and L2 at temperatures T1 and T2, respectively, the acceleration coefficient α can be found using the following formula:

L Ea: Activation energy (eV) α=2=exp 11 2

k: Boltzmann’s constant

temperature (K) T1, T2: Absolute

Figure 2.4 shows the relationship between the activation energy and the acceleration coefficient at each temperature.

It can be seen from the Arrhenius equation that the acceleration due to temperature changes drastically with the activation energy Ea. Figure 2.5 shows the relationship between each activation energy level and the accelerated coefficient when the temperature difference as a parameter.

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