1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

–50

–25

0

25

50

Ambient Temperature Ta (˚C)

75

100

125

150

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

–50

–25

0

25

50

Ambient Temperature Ta (˚C)

75

100

125

150

Test item

Test condition

No.of tested pieces

Total test time

No. of failures

1. Results of Reliability Test

s Reliability of AN6914UBS

High-temperature operation

150

120

3600

160

50

16000

0

0

0

0

Ta=125˚C

+150˚C

–65˚C

500 cycles

+125

– 40˚C

10000 cycles

Ta=125˚C

Leaving under high temperature

Thermal shock

Temperature cycle

2. Failure Rate (Refer to JIS-C-5003)

Assuming that the total test time = T(No. of test pieces

×

test time) and the No. of failures = r, the failure rate can

be calculated by obtaining r/T and multiplying it by the

numerical values commensurate with the reliability level

and the number of defective ICs.

If the failure rate (FR) is calculated from the results of

the above high temperature test of the AN6914UBS,

assuming that the reliability level is 60%;

Assuming that activation energy is 1.0 eV, FR will be

38 Fit at worst (Ta=100˚C) because an acceleration

factor differs by about 1 digit between at 125˚C and

100˚C.

T=150

r=0 comes to 0.92 at the level of 60%.

FR=0.92/2.4

Condition

Flow Chart

Screening Regulations

Assembly Finish

Assembly

Temperature Cycle Test

Normal Temperature

Characteristics Inspection

High Temperature

Characteristics Inspection

Shipping Inspection

Shipping

Inspection

Screening

150˚C=30min.,

–50˚C=30min.,

Move=5min.,

Frequency=5times

Ta=100˚C

Ta=25˚C