There is no specified operating temperature range for transistors and diodes. Stable operation is possible as long as the junction temperature Tj does not exceed the maximum rating. However, derating is highly advisable at higher temperatures. The recommended temperature range is -40°C to 100°C with a storage temperature range Tstg of -55C to 150°C.
The time to failure (product lifetime) will vary greatly depending on implementation, usage and environmental conditions. And although the failure rate can be estimated through accelerated lifetime testing, there are no specifications for product lifetime.
Depending on the storage environment, there should be no performance degradation caused by moisture absorbed by the packaging materials (MSL=1). However, solderability during mounting may be adversely affected due to terminal oxidation from long-term storage. In this case, we recommend that sufficient connection be ensured between the terminals and substrate, such as by lengthening the solder time. The recommended storage conditions are: 5-40°C, 30-80%RH, and 5 years for electroplated products. But solderability may be affected after 1 year for molten solder.