Hello,
The "A" indicates that there was a redesign of the device, however I don't have records showing what changes were made. Since this is a TTL device, the typical performance could be significantly impacted by the design changes while still meeting…
Part Number: SN74HCT74 Other Parts Discussed in Thread: SN54HCT74 In the datasheet for the SN74HCT74, page 4 shows a table for "over recommended operating free-air temperature range." There are three columns including "T A = 25°C", "SN54HCT74…