AOS Semiconductor Product Reliability Report

AOS Semiconductor
Product Reliability Report
AO5404E/AO5404EL,
rev A
Plastic Encapsulated Device
ALPHA & OMEGA Semiconductor, Inc
495 Mercury Drive
Sunnyvale, CA 94085
U.S.
Tel: (408) 830-9742
www.aosmd.com
Feb 12, 2008
1
This AOS product reliability report summarizes the qualification result for AO5404E. 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 AO5404E 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.
V.
I.
Product Description
Package and Die information
Environmental Stress Test Summary and Result
Reliability Evaluation
Quality Assurance Information
Product Description:
The AO5404E uses advanced trench technology to provide excellent RDS(ON), low gate charge
and operation with gate voltages as low as 1.8V. This device is suitable for use as a load switch
or in PWM applications. It is ESD protected. Standard Product AO5404E is Pb-free (meets
ROHS & Sony 259 specifications).
Absolute Maximum Ratings TA=25°C unless otherwise noted
Parameter
Symbol
10sec
Steady state
Units
Drain-Source Voltage
VDS
-20
V
Gate-Source Voltage
VGS
±8
V
Continuous Drain
Current
TA=25°C
TA=70°C
Pulsed Drain Current
ID
0.5
0.5
0.5
0.45
IDM
TA=25°C
Power Dissipation
TA=70°C
Junction and Storage
Temperature Range
Thermal Characteristics
Parameter
Maximum Junction-toAmbient
Maximum Junction-toAmbient
Maximum Junction-to-Lead
3
PD
TJ, TSTG
0.38
0.28
0.24
0.18
-55 to 150
Symbol
T ≤ 10s
SteadyState
SteadyState
A
RθJA
RθJL
W
°C
Typ
Max
Units
275
330
°C/W
360
450
°C/W
300
350
°C/W
2
II. Die / Package Information:
Process
Package Type
Lead Frame
Die Attach
Bond wire
Mold Material
Filler % (Spherical/Flake)
Flammability Rating
Backside Metallization
Moisture Level
AO5404E
Standard sub-micron
Low voltage N channel process
SC89
Alloy 42, Ag lead
Eutectic
Au 0.8mils
Epoxy resin with silica filler
90/10
UL-94 V-0
Ti / Ni / Ag
Up to Level 1 *
AO5404EL (Green Compound)
Standard sub-micron
Low voltage N channel process
SC89
Alloy 42, Ag lead
Eutectic
Au 0.8mils
Epoxy resin with silica filler
100/0
UL-94 V-0
Ti / Ni / Ag
Up to Level 1*
Note * based on info provided by assembler and mold compound supplier
III. Result of Reliability Stress for AO5404E (Standard) & AO5404EL (Green)
Test Item
Test Condition
Time
Point
Lot Attribution
Total
Sample
size
Solder
Reflow
Precondition
Standard: 1hr PCT+3
cycle [email protected]°c
Green: 168hr 85°c
/85%RH +3 cycle
[email protected]°c
Temp = 150°c ,
Vgs=100% of Vgsmax
0hr
Standard: 10 lots
Green: 2 lots
2546 pcs
0
82 pcs
0
HTGB
HTRB
HAST
Pressure Pot
Temperature
Cycle
Temp = 150°c ,
Vds=80% of Vdsmax
130 +/- 2°c , 85%RH,
33.3 psi, Vgs = 80% of
Vgs max
121°c , 29.7psi,
100%RH
-65°c to 150°c ,
air to air
168 / 500
hrs
1 lots
1000 hrs
(Note A*)
168 / 500
hrs
1 lots
1000 hrs
(Note A*)
100 hrs
Standard: 10 lots
Green: 2 lots
96 hrs
250 / 500
cycles
(Note B**)
Standard: 9 lots
Green: 2 lots
(Note B**)
Standard: 10 lots
Green: 2 lots
(Note B**)
Number
of
Failures
77+5 pcs /
lot
82 pcs
0
77+5 pcs /
lot
660 pcs
0
50+5 pcs /
lot
902 pcs
0
77+5 pcs /
lot
984 pcs
0
77+5 pcs /
lot
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III. Result of Reliability Stress for AO5404E (Standard) & AO5404EL (Green)
Continues
DPA
Internal Vision
Cross-section
X-ray
CSAM
NA
5
5
5
5
5
5
0
NA
5
5
0
Bond Integrity
Room Temp
150°c bake
150°c bake
0hr
250hr
500hr
40
40
40
40 wires
40 wires
40 wires
0
Solderability
245°c
5 sec
15
15 leads
0
Note A: The HTGB and HTRB reliability data presents total of available AO5404E and
AO5404EL burn-in data up to the published date.
Note B: The pressure pot, temperature cycle and HAST reliability data for AO5404E and
AO5404EL comes from the AOS generic package qualification data.
IV. Reliability Evaluation
FIT rate (per billion): 128
MTTF = 891 years
In general, 500 hrs of HTGB, 150 deg C accelerated stress testing is equivalent to 15 years of
lifetime at 55 deg C operating conditions (by applying the Arrhenius equation with an activation
energy of 0.7eV and 60% of upper confidence level on the failure rate calculation). AOS reliability
group also routinely monitors the product reliability up to 1000 hr at and performs the necessary
failure analysis on the units failed for reliability test(s).
The presentation of FIT rate for the individual product reliability is restricted by the actual burn-in
sample size of the selected product (AO5404E). Failure Rate Determination is based on JEDEC
Standard JESD 85. FIT means one failure per billion hours.
Failure Rate = Chi2 x 109 / [2 (N) (H) (Af)] = 1.83 x 109 / [2 (164) (168) (258)] = 128
MTTF = 109 / FIT = 7.81 x 106hrs = 891 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
4
V. Quality Assurance Information
Acceptable Quality Level for outgoing inspection: 0.1% for electrical and visual.
Guaranteed Outgoing Defect Rate: < 25 ppm
Quality Sample Plan: conform to Mil-Std-105D
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