Reliability Report

AOS Semiconductor
Product Reliability Report
AON7444,
rev A
Plastic Encapsulated Device
ALPHA & OMEGA Semiconductor, Inc
www.aosmd.com
This AOS product reliability report summarizes the qualification result for AON7444.
Accelerated environmental tests are performed on a specific sample size, and then followed
by electrical test at end point. Review of final electrical test result confirms that AON7444
passes AOS quality and reliability requirements. The released product will be categorized by
the process family and be monitored on a quarterly basis for continuously improving the
product quality.
Table of Contents:
I.
II.
III.
IV.
Product Description
Package and Die information
Environmental Stress Test Summary and Result
Reliability Evaluation
I. Product Description:
TM
The AON7444 is fabricated with SDMOS trench technology that combines excellent RDS(ON)
with low gate charge and low Qrr. The result is outstanding efficiency with controlled switching
behavior. This universal technology is well suited for PWM, load switching and general
purpose applications.
-RoHS Compliant
- Halogen Free
Detailed information refers to datasheet.
II. Die / Package Information:
AON7444
Standard sub-micron
Low voltage N channel
Package Type
DFN 3x3A
Lead Frame
Cu
Die Attach
Ag epoxy
Bonding
Au wire
Mold Material
Epoxy resin with silica filler
MSL (moisture sensitive level) Level 1 based on J-STD-020
Process
Note * based on information provided by assembler and mold compound supplier
III. Result of Reliability Stress for AON7444
Test Item
Test Condition
Time
Point
MSL
Precondition
168hr 85°c
/85%RH +3 cycle
reflow@260°c
-
HTGB
Temp = 150 °c,
Vgs=100% of
Vgsmax
168hrs
500 hrs
1000 hrs
Lot
Attribution
Total
Sample
size
Number
of
Failures
11 lots
1815pcs
0
JESD22A113
308pcs
0
JESD22A108
0
JESD22A108
605pcs
0
JESD22A110
1 lot
3 lots
(Note A*)
Standard
77pcs / lot
HTRB
Temp = 150 °c,
Vds=80% of
Vdsmax
168hrs
500 hrs
1000 hrs
HAST
130 +/- 2°°c,
85%RH, 33.3 psi,
Vgs = 100% of
Vgs max
121°°c, 29.7psi,
RH=100%
100 hrs
11 lots
96 hrs
(Note A*)
11 lots
55pcs / lot
605pcs
0
JESD22A102
-65°°c to 150°°c,
air to air
250 / 500
cycles
(Note A*)
11 lots
55pcs / lot
605pcs
0
JESD22A104
(Note A*)
55pcs / lot
1 lot
3 lots
(Note A*)
Pressure Pot
Temperature
Cycle
308pcs
77pcs / lot
Note A: The reliability data presents total of available generic data up to the published date.
IV. Reliability Evaluation
FIT rate (per billion): 14
MTTF = 8268 years
The presentation of FIT rate for the individual product reliability is restricted by the actual
burn-in sample size of the selected product (AON7444). Failure Rate Determination is based
on JEDEC Standard JESD 85. FIT means one failure per billion hours.
2
9
Failure Rate = Chi x 10 / [2 (N) (H) (Af)]
9
= 1.83 x 10 / [2x (2x77x168+6x77x500) x258] = 14
9
7
MTTF = 10 / FIT = 7.24 x 10 hrs = 8268 years
Chi² = Chi Squared Distribution, determined by the number of failures and confidence interval
N = Total Number of units from HTRB and HTGB tests
H = Duration of HTRB/HTGB testing
Af = Acceleration Factor from Test to Use Conditions (Ea = 0.7eV and Tuse = 55°C)
Acceleration Factor [Af] = Exp [Ea / k (1/Tj u – 1/Tj s)]
Acceleration Factor ratio list:
Af
55 deg C
70 deg C
85 deg C
100 deg C
115 deg C
130 deg C
150 deg C
258
87
32
13
5.64
2.59
1
Tj s = Stressed junction temperature in degree (Kelvin), K = C+273.16
Tj u = The use junction temperature in degree (Kelvin), K = C+273.16
-5
K = Boltzmann’s constant, 8.617164 X 10 eV / K