AOS Semiconductor Product Reliability Report AO4882, rev A Plastic Encapsulated Device ALPHA & OMEGA Semiconductor, Inc www.aosmd.com This AOS product reliability report summarizes the qualification result for AO4882. 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 AO4882 passes AOS quality and reliability requirements. Table of Contents: I. II. III. IV. Product Description Package and Die information Environmental Stress Test Summary and Result Reliability Evaluation I. Product Description: The AO4882 uses advanced trench technology to provide excellent RDS(ON) with low gate charge. This is an all purpose device that is suitable for use in a wide range of power conversion applications. - RoHS Compliant - Halogen Free Detailed information refers to datasheet. II. Die / Package Information: AO4882 Standard sub-micron Low voltage Dual N channel Package Type SO8 Lead Frame Cu Die Attach Ag Epoxy Bonding Cu 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 AO4882 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 HTRB HAST Pressure Pot Temperature Cycle Lot Attribution Total Sample size Number of Failures 29 lots 3575pcs 0 JESD22A113 1 lot 308pcs 0 JESD22A108 0 JESD22A108 880pcs 0 JESD22A110 3 lots (Note A*) Standard 77pcs / lot Temp = 150 °c, Vds=80% of Vdsmax 168hrs 500 hrs 1000 hrs 130 +/- 2°°c, 85%RH, 33.3 psi, Vgs = 100% of Vgs max 121°°c, 29.7psi, RH=100% 100 hrs 16 lots 96 hrs (Note A*) 20 lots 55 pcs / lot 1100pcs 0 JESD22A102 -65°°c to 150°°c, air to air 250 / 500 cycles (Note A*) 29 lots 55 pcs / lot 1595pcs 0 JESD22A104 (Note A*) 55 pcs / lot 1 lot 3 lots (Note A*) 308pcs 77pcs / lot Note A: The reliability data presents total available generic data up to the published date. IV. Reliability Evaluation FIT rate (per billion): 7 MTTF = 15704 years The presentation of FIT rate for the individual product reliability is restricted by the actual burn-in sample size of the selected product (AO4882). 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+6x77x1000) x258] = 7 9 8 MTTF = 10 / FIT = 1.38 x 10 hrs = 15704 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