IPC-2221 (table 4-3) has the following information: Gold (min) on areas to be wire bonded (ultrasonic) Class 1: 0.05 um (micrometers) Class 2: 0.05 um Class 3: 0.15 um Gold (min) on areas to be wire bonded (thermosonic) Class 1: 0.3 um Class 2: 0.3 um Class 3: 0.8 um Lisa Williams Technical Project Manager IPC 2215 Sanders Road Nortbrook, IL 60062 www.ipc.org >>> "(Eden Chen)" <[log in to unmask]> 09/25/98 04:16AM >>> Dear Member, I like to know the minimum thickness of bondable gold over nickel for gold wire and aluminum wire. Which standard can i refer to? Thank you very much. Eden ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################ ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################