1N5221B - 1N5279B

     There are some parameters for 1N5221B - 1N5279B, under the situation TA = 25°C unless otherwise noted. such as PD(Power Dissipation Derate above 75°C )= 500 mW or 4.0 mW/°C, TSTG(Storage Temperature Range)=-65 to +200 °C, TJ(Maximum Junction Operating Temperature)=+ 200°C and Lead Temperature (1/16" from case for 10 seconds)= + 230 °C. All the ratings are limiting values above which the serviceability of the diode may be impaired. Non-recurrent square wave PW= 8.3 ms, TA= 50 degrees C.
      For all of the Zeners (1N5221B - 1N5279B), the definition of advance information (the datasheet contains the design specifications for product development. Specifications may change in any manner without notice.), when product under formative or in design. The definition of Preliminary (This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.), when product is the first production. The definition of No Identification Needed (This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.), when product is the full production. The definition of Obsolete (This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only), when product is not in production.