ZM4745A

ZM 4728...ZM 4764 SILICON PLANAR POWER ZENER DIODES LL-41 for use in stabilizing and clipping circuits with high power rating. Standard Zener voltage tolerance is ±10%. Add suffix “A” for ±5% tolerance and suffix “B” for ±2% tolerance. Other tolerances available are upon request. These diodes are also available in DO-41 case with the type designation 1N4728...1N4764 . Absolute Maximum Ratings (Ta = 25oC) Symbol Value Unit Ptot 1 Tj 175 O -65 to +175 O Zener Current see Table “Characteristics” Power Dissipation Junction Temperature Storage Temperature Range 1) TS 1) W C C Valid provided that electrodes are kept at ambient temperature. Characteristics at Tamb = 25oC Thermal Resistance Junction to Ambient Air Forward Voltage at IF = 200mA 1) Symbol Min. Typ. Max. Unit RthA - - 1701) K/W VF - - 1.2 V Valid provided that electrodes are kept at ambient temperature. SEMTECH ELECTRONICS LTD. ® (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) Dated : 10/05/2005 ZM 4728...ZM 4764 Nominal Zener voltage3) Test current Maximum reverse leakage current Maximum Zener Impedance1) Surge current TYPE at IZT Vz V ZM4728 3.3 ZM4729 IZTmA at IZT VzΩ 76 10 3.6 69 ZM4730 3.9 ZM4731 4.3 ZM4732 Maximum regulator current2) IR μA at VR V at TA = 25oC IR mA IZMmA 150 1 1375 275 1 100 1 1260 252 400 1 100 1 1190 234 400 1 50 1 1070 217 8 500 1 10 1 970 193 49 7 550 1 10 1 890 178 45 5 600 1 10 2 810 162 6.2 41 2 700 1 10 3 730 146 ZM4736 6.8 37 3.5 700 1 10 4 660 133 ZM4737 7.5 34 4.0 700 0.5 10 5 605 121 ZM4738 8.2 31 4.5 700 0.5 10 6 550 110 ZM4739 9.1 28 5.0 700 0.5 10 7 500 100 ZM4740 10 25 7 700 0.25 10 7.6 454 91 ZM4741 11 23 8 700 0.25 5 8.4 414 83 ZM4742 12 21 9 700 0.25 5 9.1 380 76 ZM4743 13 19 10 700 0.25 5 9.9 344 69 ZM4744 15 17 14 700 0.25 5 11.4 304 61 ZM4745 16 15.5 16 700 0.25 5 12.2 285 57 ZM4746 18 14 20 750 0.25 5 13.7 250 50 ZM4747 20 12.5 22 750 0.25 5 15.2 225 45 ZM4748 22 11.5 23 750 0.25 5 16.7 205 41 ZM4749 24 10.5 25 750 0.25 5 18.2 190 38 ZM4750 27 9.5 35 750 0.25 5 20.6 170 34 ZM4751 30 8.5 40 1000 0.25 5 22.8 150 30 ZM4752 33 7.5 45 1000 0.25 5 25.1 135 27 ZM4753 36 7.0 50 1000 0.25 5 27.4 125 25 ZM4754 39 6.5 60 1000 0.25 5 29.7 115 23 ZM4755 43 6.0 70 1500 0.25 5 32.7 110 22 ZM4756 47 5.5 80 1500 0.25 5 35.8 95 19 ZM4757 51 5.0 95 1500 0.25 5 38.8 90 18 ZM4758 56 4.5 110 2000 0.25 5 42.6 80 16 ZM4759 62 4.0 125 2000 0.25 5 47.1 70 14 ZM4760 68 3.7 150 2000 0.25 5 51.7 65 13 ZM4761 75 3.3 175 2000 0.25 5 56.0 60 12 ZM4762 82 3.0 200 3000 0.25 5 62.2 55 11 ZM4763 91 2.8 250 3000 0.25 5 69.2 50 10 ZM4764 100 2.5 350 3000 0.25 5 76 45 9 VzkΩ at IZKmA 400 1 10 400 64 9 58 9 4.7 53 ZM4733 5.1 ZM4734 5.6 ZM4735 1) The Zener Impedance is derived from the 60 Hz 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. 2) Valid provided that electrodes are kept at ambient temperature. 3) Measured under thermal equilibrium and DC test conditions. SEMTECH ELECTRONICS LTD. ® (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) Dated : 10/05/2005 4) Tested with pulses tp = 20 ms. ZM 4728...ZM 4764 Admissible power dissipation versus ambient temperature Valid provided that electrodes are kept at ambient temperature W 1.0 P tot ZM4728... 0.8 0.6 0.4 0.2 0 0 100 o 200 C Tamb SEMTECH ELECTRONICS LTD. ® (Subsidiary of Sino-Tech International Holdings Limited, a company listed on the Hong Kong Stock Exchange, Stock Code: 724) Dated : 10/05/2005