1. An 7.5 V zener diode (7.5 V at 25 deg C) has a negative temperature coefficient of 0.01% / deg C What is the zener voltage at 75 deg C. 2. A certain zener diode has a maximum power rating of 300 mW at 40 deg C and a derating factor of 1.4mW/deg C. Determine the maximum power the zener can dissipate at a temperature of 80 deg C 3. From the datasheet, a 1N4728A zener diode has a ZZ of 100. The datasheet gives VZ-3.3 V at a test current, IZ, of 76 mA. What is the voltage across the zener terminals when the current is 90 mA? When the current is 45 mA? Electrical Characteristics-29 chase nad Vz (V)@1) Max. Zener Impedance Leakage Current Test Current Device Min. Typ. Max. Iz (mA) Zz@lz ZzK@ אל! IR VR (N) (12) אz (mA) (μA) 3 (S) 1N4728A 3.315 3.3 3.465 IN4729A 3.42 3.6 3.78 IN4730A 3.705 3.9 4.095 1N4731A 4.085 4.3 4.515 IN4732A 4.465 4.7 4.935 1N4733A 4.845 5.1 5.355 49 IN4734A 5.32 5.6 5.88 IN4735A 5.89 1N4736A 6.46 IN4737A 7.125 199 62 68 20 6.51 41 7.14 7.5 7.875 1N4738A 7.79 8.2 8.61 31 2838299535 76 10 400 1 100 1 10 400 1 100 1 64 9 400 1 9 400 1 8 500 1 7 550 1 45 5 600 1 2 700 1 10 37 3.5 700 1 10 34 4 700 05 10 4.5 700 0.5 10 888888888 50 1 10 1 10 1 10 1 10 23456