Question Can you tell me what are the differences between OP77FJZ and 5962-8773802GA.I also cannot find the 5962-8773802GA in the datasheet. Answer The OP77FJZ is a standard qualified and specified part.You could find the actual datasheet here:http://www.analog.com/media/en/technical-documentation/data-sheets/OP77.pdfthe Z indicates a PB-free lead finish The 5962-8773802GA is the SMD Standard Military Drawing (5962-) version of the OP77.Please find attached the datasheet Rev C of the OP77 datasheet - Please see side 7. (containing the 5962-8773802GA)The 5962-8773802GA is specified over a temp range of -55C - +125C An OP77FJZ CANNOT be used to replace an 5962-8773802GA.