AOS Semiconductor Product Reliability Report AON3816/AON3816L, rev A Plastic Encapsulated Device ALPHA & OMEGA Semiconductor, Inc 495 Mercury Drive Sunnyvale, CA 94085 U.S. Tel: (408) 830-9742 www.aosmd.com Mar 28, 2007 1 This AOS product reliability report summarizes the qualification result for AON3816. 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 AON3816 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. Product Description Package and Die information Environmental Stress Test Summary and Result Reliability Evaluation Quality Assurance Information I. Product Description: The AON3816 uses advanced trench technology to provide excellent RDS(ON), low gate charge. It is ESD protected. This device is suitable for use as a unidirectional or bi-directional load switch, facilitated by its common-drain configuration. Standard Product AON3816 is Pb-free (meets ROHS & Sony 259 specifications). Absolute Maximum Ratings TA=25°C unless otherwise noted Parameter Symbol 4sec Steady State Units Drain-Source Voltage VDS 20 V Gate-Source Voltage VGS ± 12 V Continuous Drain Current TA=25°C TA=70°C Pulsed Drain Current ID 4 4 4 4 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 20 PD TJ, TSTG 2.4 1.4 1.5 0.9 W -55 to 150 Symbol T ≤ 10s SteadyState SteadyState A RθJA RθJL °C Typ Max Units 43 52 °C/W 80 90 °C/W 33 50 °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 AON3816 AON3816L (Green Compound) Standard sub-micron Low voltage N channel process DFN 3×3 Copper with Ag spot Ag epoxy Au 2mils Epoxy resin with silica filler 90/10 UL-94 V-0 Ti / Ni / Ag Up to Level 1 * Standard sub-micron Low voltage N channel process DFN 3×3 Copper with Ag spot Ag epoxy Au 2 mils 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 AON3816 (Standard) & AON3816L (Green) Test Item Test Condition Time Point Solder Reflow Precondition Standard: 1hr PCT+3 cycle reflow@260°c Green: 168hr 85°c /85%RH +3 cycle reflow @260°c Temp = 150°c , Vgs=100% of Vgsmax 0hr HTGB 168 / 500 hrs 1000 hrs HTRB Temp = 150°c , Vds=80% of Vdsmax 168 / 500 hrs 1000 hrs HAST Pressure Pot Temperature Cycle 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 Lot Attribution Standard: 5 lots Green: 8 lots (Note B**) 1 lot (Note A*) 1 lot 100 hrs (Note A*) Standard: 5 lots Green: 6 lots 96 hrs (Note B**) Standard: 4 lots Green: 7 lots 250 / 500 cycles (Note B**) Standard: 3 lots Green: 8 lot (Note B**) Total Sample size Number of Failures 1815 pcs 0 82 pcs 0 77+5 pcs / lot 82 pcs 0 77+5 pcs / lot 605 pcs 0 50+5 pcs / lot 605 pcs 0 50+5 pcs / lot 605 pcs 0 50+5 pcs / lot 3 III. Result of Reliability Stress for AON3816 (Standard) & AON3816 L (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 AON3816 and AON3816L burn-in data up to the published date. Note B: The pressure pot, temperature cycle and HAST reliability data for AON3816 and AON3816L 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 (AON3816). 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 Tjs = Stressed junction temperature in degree (Kelvin), K = C+273.16 Tju =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 5