AOS Semiconductor Product Reliability Report AOD4286, rev A Plastic Encapsulated Device ALPHA & OMEGA Semiconductor, Inc www.aosmd.com 1 This AOS product reliability report summarizes the qualification result for AOD4286. 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 AOD4286 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: The AOD4286 uses trench MOSFET technology that is uniquely optimized to provide the most efficient high frequency switching performance. Both conduction and switching power losses are minimized due to an extremely low combination of RDS(ON), Ciss and Coss. This device is ideal for boost converters and synchronous rectifiers for consumer, telecom, industrial power supplies and LED backlighting. Details refer to the datasheet. II. Die / Package Information: AOD4286 Standard sub-micron 100V N channel process 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 2 III. Result of Reliability Stress for AOD4286 Test Item Test Condition Time Point MSL Precondition 168hr 85°c /85%RH +3 cycle reflow@260°c Temp = 150°c , Vgs=100% of Vgsmax - Temp = 150°c , Vds=80% of Vdsmax 168hrs 500 hrs 1000 hrs HTGB HTRB Lot Attribution 9 lots 168hrs 500 hrs 1000 hrs 1 lot (Note A*) Total Sample size 0 JESD22A113 77pcs 0 JESD22A108 0 JESD22A108 495pcs 0 JESD22A110 0 JESD22A102 0 JESD22A104 77pcs / lot 77pcs 1 lot (Note A*) 77pcs / 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*) 5 lots 55 pcs / lot 275pcs (Note A*) 55 pcs / lot -65°c to 150°c , air to air, 250 / 500 cycles 8 lots (Note A*) Reference Standard 1210pcs HAST Temperature Cycle Number of Failures 440pcs 55 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): 23 MTTF = 4957 years The presentation of FIT rate for the individual product reliability is restricted by the actual burn-in sample size of the selected product (AOD4286). Failure Rate Determination is based on JEDEC Standard JESD 85. FIT means one failure per billion hours. 2 9 9 Failure Rate = Chi x 10 / [2 (N) (H) (Af)] = 1.83 x 10 9 7 MTTF = 10 / FIT = 4.34 x 10 hrs = 4957years / [2x (2x77x1000) x258] = 23 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 3