Chad: AOQL is a standardized methodology for reporting outgoing defects from a component supplier. The level at which any component supplier is likely to attain is highly dependent on the product, its complexity and maturity. In general, here's the guidelines I have followed in the past, and are somewhat arbitrary: ASIC (digital) <4M gates: Infancy: 1000 DPPM; Mature: 200 DPPM ASIC (digital) >4M gates: Infancy: 1200 DPPM; Mature: 500 DPPM ASIC (mixed signal) <4M gates: Infancy: 1200 DPPM; Mature: 700 DPPM ASIC (mixed signal) >4M gates: Infancy: 1500 DPPM; Mature: 1000 DPPM Commercial devices (except memory) (digital): 60 DPPM Commercial devices (mixed signal): 100 DPPM Memory devices: 3.5 DPPM/million bits of storage (thus a 1Mx16 DRAM would be 3.5 X 1M X 16 = 56 DPPM) Passive components (SMT caps, inductors and resistors- all cermic/ceramic core): 10~20 DPPM All of the numbers for semiconductors assume a non-epi, CMOS fab process. The 4M gate level appears to be generally where the chip size (driven by complexity and gate technology) crosses over with the ability of the tools to prevent defects (predominant particulate driven, though some are non-particle defects, such as implant anomalies). Most AOQL levels are negotiated by purchase contract, and should be readily available from the component manufacturer. Hope this helps... > Bill Davis, Ph.D. > Diamond Multimedia Systems > Senior Scientist > Tel. 408.325.7868 > Cell. 408.888.5650 > e-mail: [log in to unmask] > > -----Original Message----- From: Thibodeau, Chad [mailto:[log in to unmask]] Sent: Wednesday, February 24, 1999 2:51 PM To: [log in to unmask] Subject: [TN] Component Defect Percentage/PPM I was wondering if anyone knew an industry standard number for acceptable defect rates for components. I.e. an acceptable rate of 10% failure for components that the supplier can quote so not to have their lot rejected. It may be that this differs for different types of components (passives may have a much lower rate of failure than say I.C.'s). Any help is appreciated. I did hear Xilinx quote an industry standard AOQL (Acceptable Outgoing Quality Level) of 25 ppm, but want to confirm if this is the same as I am talking about. Thanks for any help. Chad Thibodeau Component Engineer [log in to unmask] 2114 W. 7th Street Tempe, AZ 85281 P-602 333-2138 F-602 921-9012 http://www.efdata.com ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################