AOS Semiconductor Product Reliability Report AON6978, rev A Plastic Encapsulated Device ALPHA & OMEGA Semiconductor, Inc www.aosmd.com This AOS product reliability report summarizes the qualification result for AON6978. 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 AON6978 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: • Latest Trench Power AlphaMOS (αMOS LV) technology • Integrated Schottky Diode (SRFET) on Low-Side • Very Low RDS(on) at 4.5V VGS • Low Gate Charge • High Current Capability Application • DC/DC Converters in Computing, Servers, and POL • Isolated DC/DC Converters in Telecom and Industrial -RoHS Compliant -Halogen-Free Detailed information refers to datasheet. II. Die / Package Information: AON6978 Standard sub-micron Low voltage N channel Package Type DFN 5x6B Lead Frame Bare Cu Die Attach Ag Epoxy Bonding Cu & Au 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 AON6978 Test Item Test Condition Time Point Lot Attribution Total Sample size Number of Failures MSL Precondition 168hr 85°c /85%RH +3 cycle reflow@260°c HTGB Standard - 12 lots 2310pcs 0 JESD22A113 Temp = 150 c, Vgs=100% of Vgsmax 168hrs 500 hrs 1000 hrs 1 lot 4 lots 2 lots 539pcs 0 JESD22A108 HTRB Temp = 150 c, Vds=80% of Vdsmax 168hrs 500 hrs 1000 hrs 1 lot 4 lots 2 lots 77pcs / lot 539pcs 0 JESD22A108 HAST 130 c, 85%RH, 33.3 psi, Vds = 80% of Vdsmax 96 hrs 9 lots 77pcs / lot 693pcs 0 JESD22A110 Pressure Pot 121c, 29.7psi, RH=100% 96 hrs (Note A*) 9 lots 77 pcs / lot 693pcs 0 JESD22A102 Temperature Cycle -65c to 150c, air to air 250 / 500 cycles (Note A*) 12 lots 77 pcs / lot 924pcs 0 JESD22A104 (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): 5.49 MTTF = 20784 years The presentation of FIT rate for the individual product reliability is restricted by the actual burn-in sample size of the selected product (AON6978). 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 +8x77x500 +4x77x1000) x259] = 5.49 9 8 MTTF = 10 / FIT = 1.82 x 10 hrs = 20784 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: 55 deg C 70 deg C 85 deg C 100 deg C 115 deg C Af 259 88 32 13 5.64 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 130 deg C 150 deg C 2.59 1