features ds18009 rev. 3 - 3 1 of 3 zm4728a-zm4764a www.diodes.com diodes incorporated zm4728a - zm4764a 1.0w surface mount zener diode case: melf, glass terminals: solderable per mil-std-202, method 208 polarity: cathode band approx. weight: 0.25 grams mechanical data 1.0w power dissipation 3.9v - 100v nominal zener voltages standard v z tolerance is 5% @ t a = 25c unless otherwise specified characteristic symbol value unit zener current (see table page 2) i z p d/ v z ma power dissipation @ t a = 25c p d 1w thermal resistance - junction to ambient air r ja 170 k/w forward voltage @ i f = 200 ma v f 1.2 v operating & storage temperature range t j ,t stg -65 to +200 c melf dim min max a 4.80 5.20 b 2.40 2.60 c 0.55 nominal all dimensions in mm c a b maximum ratings notes: 1. measured under thermal equilibrium and dc (i zt ) test conditions. 2. 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 (i zt or i zk ) is superimposed on i zt or i zk . zener impedance is measured at two points to insure a sharp knee on the breakdown curve and to eliminate unstable units. not recommended for new design, use smaz series (sma package)
ds18009 rev. 3 - 3 2 of 3 zm4728a-zm4764a www.diodes.com notes: 1. measured under thermal equilibrium and dc (i zt ) test conditions. 2. 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 (i zt or i zk ) is superimposed on i zt or i zk . zener impedance is measured at two points to insure a sharp knee on the breakdown curve and to eliminate unstable units. type number nominal zener voltage (1) test current maximum zener impedance (2) maximum reverse leakage current max surge current 8.3ms maximum zener current v z @ i zt i zt z zt @ i zt z zk @ i zk i zk i r @v r i zs i zm vma ma a v ma ma zm4728a 3.3 76 10 400 1.0 100 1.0 1380 276 zm4729a 3.6 69 10 400 1.0 100 1.0 1260 252 zm4730a 3.9 64 9.0 400 1.0 50 1.0 1190 234 zm4731a 4.3 58 9.0 400 1.0 10 1.0 1070 217 zm4732a 4.7 53 8.0 500 1.0 10 1.0 970 193 zm4733a 5.1 49 7.0 550 1.0 10 1.0 890 178 zm4734a 5.6 45 5.0 600 1.0 10 2.0 810 162 zm4735a 6.2 41 2.0 700 1.0 10 3.0 730 146 zm4736a 6.8 37 3.5 700 1.0 10 4.0 660 133 zm4737a 7.5 34 4.0 700 0.5 10 5.0 605 121 zm4738a 8.2 31 4.5 700 0.5 10 6.0 550 110 zm4739a 9.1 28 5.0 700 0.5 10 7.0 500 100 zm4740a 10 25 7.0 700 0.25 10 7.6 454 91 zm4741a 11 23 8.0 700 0.25 5.0 8.4 414 83 zm4742a 12 21 9.0 700 0.25 5.0 9.1 380 76 zm4743a 13 19 10 700 0.25 5.0 9.9 344 69 zm4744a 15 17 14 700 0.25 5.0 11.4 304 61 zm4745a 16 15.5 16 700 0.25 5.0 12.2 285 57 zm4746a 18 14 20 750 0.25 5.0 13.7 250 50 zm4747a 20 12.5 22 750 0.25 5.0 15.2 225 45 zm4748a 22 11.5 23 750 0.25 5.0 16.7 205 41 zm4749a 24 10.5 25 750 0.25 5.0 18.2 190 38 zm4750a 27 9.5 35 750 0.25 5.0 20.6 170 34 zm4751a 30 8.5 40 1000 0.25 5.0 22.8 150 30 zm4752a 33 7.5 45 1000 0.25 5.0 25.1 135 27 zm4753a 36 7.0 50 1000 0.25 5.0 27.4 125 25 zm4754a 39 6.5 60 1000 0.25 5.0 29.7 115 23 zm4755a 43 6.0 70 1500 0.25 5.0 32.7 110 22 zm4756a 47 5.5 80 1500 0.25 5.0 35.8 95 19 zm4757a 51 5.0 95 1500 0.25 5.0 38.8 90 18 zm4758a 56 4.5 110 2000 0.25 5.0 42.6 80 16 zm4759a 62 4.0 125 2000 0.25 5.0 47.1 70 14 zm4760a 68 3.7 150 2000 0.25 5.0 51.7 65 13 zm4761a 75 3.3 175 2000 0.25 5.0 56.0 60 12 zm4762a 82 3.0 200 3000 0.25 5.0 62.2 55 11 ZM4763A 91 2.8 250 3000 0.25 5.0 69.2 50 10 zm4764a 100 2.5 350 3000 0.25 5.0 76.0 45 9.0 electrical characteristics @ t a = 25c unless otherwise specified not recommended for new design, use smaz series (sma package)
ds18009 rev. 3 - 3 3 of 3 zm4728a-zm4764a www.diodes.com 0 0.2 0.8 1.0 0.6 0.4 0 100 200 p,p o wer dissipati o n(w) d t , ambient temperature (c) a fig. 1, power derating curve not recommended for new design, use smaz series (sma package)
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