ZM4738AST

Features of the ZM4738AST are:(1)1.0W power dissipation;(2)3.9V - 100V nominal zener voltages;(3)standard VZ tolerance is 5%.

Applications of the ZM4738AST are:(1)case: MELF, glass;(2)terminals: solderable per MIL-STD-202,method 208;(3)polarity: cathode band;(4)approx. weight: 0.25 grams.

The absolute maximum ratings of the ZM4738AST can be summarized as:(1):the characteristics is zener current,the symbol is Iz,the value is Pd/Vz,the unit is mA;(2):the characteristics is power dissipation @ TA = 25,the symbol is Pd,the value is 1,the unit is W;(3):the characteristics is thermal resistance - junction to ambient air,the symbol is RJA,the value is 170,the unit is k/W;(4):the characteristics is forward voltage @ IF = 200 mA,the symbol is VF,the value is 1.2,the unit is V;(5):the characteristics is operating & storage temperature range,the symbol is Tj, TSTG,the value is -65 to +200,the unit is .Measured under thermal equilibrium and DC (IZT) test conditions.The Zener impedance is derived from the 60Hz AC voltage which results when an AC current having an RMS value equal to 10% of the Zener current (IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at two points to insure a sharp knee on the breakdown curve and to eliminate unstable units.