AN668 datasheet(17/19 Pages) STMICROELECTRONICS

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AN668 APPLICATION NOTE

RELIABILITY DATA

The information presented in this section shows that

PowerSO-20/36 are able to work reliably in severe

environments, like automotive, where the requested

reliability target is 1 ppm failure rate.

In order to evaluate the reliability behavior of the

present package a complete qualification program

was compiled with two test vehicles:

- TDA7350A (Audio Power Amplifier)

- ABS voltage regulator

A list of the tests, their features and the failure modes

associated to these tests is given in Table 4.

Tables 5 and 6 show the results of the qualification; all

the package and die oriented tests were passed suc-

cessfully. The test conditions and acceptance criteria

are the same as those for standard power packages.

Table 4. Reliability tests description.

Table 5. ABS Voltage Regulator (die size 5.3 x 5.28mm)

Test

Features

Purpose

High Temperature Reverse Bias

(H.T.R.B.)

Reverse biased device at elevated

temperature

To detect surface defects like poor

passivation and contamination

Operating Life Test (O.L.T.)

Device submitted to application condi-

tions

To put in evedence thermomechanical

sresses induced by internal power

dissipation

Thermal Humidity Bias (T.H.B.)

Biased in presence of steam

Metal corrosion detection

Power ambient

Detect craked die, wire bond break-

ing, mechanical damage to package

Pressure Pot Test (P.P.T.)

High temperature and pressure with

saturated steam

Electrochemical and galvanic corro-

sion

Solderability Test (S.T.)

Verifies tinning process

Detects poor solder joint

Enviromental Sequence (E.S.)

Thermal cycling combined with pres-

sure pot

To stdy corrosion mechanism after

thermal cycling stress

Surface Mount (S.M.)

Simulation of soldering process in the

presence of humidity

To point out the package resistance to

the tresses due to surface mounting

in presence of humidity

Resistance toSolvens (R.S.)

Mil-Std-883 Meth. 2015

To verify the marking permanency

Test

Condition

Sample

Duration

Failure

T.C.T.

Tamb = -65°C to +150°C air to air

153 pcs. x 3 lots

153 pcs. x 1 lots

1000 cy

2000 cy

T.S.T.

Tamb = -65°C to +150°C liquid to liquid

60 pcs. x 3 lots

1000 cy

P.P.T.

Tamb = 121°C P = 2atm

77 pcs. x 3 lots

500hr

S.T. 1

Tamb = 215°C; precond. 8h vapor

22 pcs. x 3 lots

–

S.T. 2

Tamb = 215°C; precond. 8h vapor at

Tamb = 155°C

22 pcs. x 3 lots

–

E.S.

100cy at -65°C to +150°C 48hr of PPT at

3atm (5 Times Repeated)

25 pcs. x 3 lots

–

S.M.

24hr at 85°C/85%dipping at 260°C 10"48h

PPT at 2.5atm

22 pcs. x 3 lots

–

R.S.

Mil-Std-883 Meth 2015

22 pcs. x 3 lots

–

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