Reliability Report

AOS Semiconductor
Product Reliability Report
AOD526,
rev A
Plastic Encapsulated Device
ALPHA & OMEGA Semiconductor, Inc
www.aosmd.com
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This AOS product reliability report summarizes the qualification result for AOD526. 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 AOD526 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:
• Latest Trench Power MOSFET technology
• Very Low RDS(on) at 4.5VGS
• Low Gate Charge
• High Current Capability
-RoHS Compliant
-Halogen-Free
Details refer to the datasheet.
II. Die / Package Information:
AOD526
Standard sub-micron
30V N-Channel AlphaMOS
Package Type
TO252
Lead Frame
Bare Cu
Die Attach
Soft solder
Bonding
Al & Au wire
Mold Material
Epoxy resin with silica filler
Moisture Level
Up to Level 1 *
Note * based on info provided by assembler and mold compound supplier
Process
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III. Result of Reliability Stress for AOD526
Test Item
Test Condition
Time
Point
MSL
Precondition
168hr 85°c
/85%RH +3 cycle
[email protected]°c
Temp = 150°c ,
Vgs=100% of
Vgsmax
-
HTGB
HTRB
Temp = 150°c ,
Vds=80% of
Vdsmax
168hrs
500 hrs
1000 hrs
168hrs
500 hrs
1000 hrs
Lot
Attribution
Total
Sample size
2266pcs
0
JESD22A113
3 lot
462pcs
0
JESD22A108
0
JESD22A108
495pcs
0
JESD22A110
0
JESD22A102
0
JESD22A104
3 lot
(Note A*)
77 pcs / lot
3 lot
462pcs
3 lot
(Note A*)
77 pcs / lot
130 °c , 85%RH,
33.3 psi, Vgs =
100% of Vgs max
100 hrs
9 lots
Pressure Pot
121°c , 29.7psi,
RH=100%
96 hrs
(Note A*)
10lots
55 pcs / lot
770pcs
(Note A*)
77 pcs / lot
-65°c to 150°c ,
air to air,
250 / 500
cycles
Reference
Standard
13 lots
HAST
Temperature
Cycle
Number
of
Failures
13 lots
1001pcs
(Note A*)
77 pcs / lot
Note A: The reliability data presents total of available generic data up to the published date.
IV. Reliability Evaluation
FIT rate (per billion): 7
MTTF = 17369 years
The presentation of FIT rate for the individual product reliability is restricted by the actual burn-in
sample size of the selected product (AOD526). Failure Rate Determination is based on JEDEC
Standard JESD 85. FIT means one failure per billion hours.
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9
Failure Rate = Chi x 10 / [2 (N) (H) (Af)]
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= 1.83 x 10 / [2x (6x77x168+6x77x1000) x258] = 7
9
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MTTF = 10 / FIT = 1.38 x 10 hrs = 17369 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
k = Boltzmann’s constant, 8.617164 X 10-5eV / K
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