website: www.kingtronics.com email: info@kingtronics.com tel: (852) 8106 7033 fax: (852) 8106 7099 1 ZM4728 thru zm4761 silicon planar power zener diodes ll-41 features glass case ll-41 dimensions in mm for use in stabilizing and clipping circuits with high power rating. standard zener voltage tolerance is 5%. add suffix "a" for 5% tolerance and suffix "b" for 2% tolerance. these diodes are also available in do-41 case with the type designation 1n4728...1n4761 absolute maximum ratings (t a = 25 ) parameter symbol value units power dissipation p tot 1 1) w junction temperature t j 175 storage temperature range t stg - 65 to + 175 1) valid provided that electrodes ar e kept at ambient temperature. characteristics at t a = 25 parameter symbol max. units thermal resistance junction to ambient air r ja 170 1) k/w forward voltage at i f = 200 ma v f 1.2 v 1) valid provided that electrodes ar e kept at ambient temperature.
website: www.kingtronics.com email: info@kingtronics.com tel: (852) 8106 7033 fax: (852) 8106 7099 2 ZM4728 thru zm4761 characteristics at ta = 25 zener voltage 3) dynamic resistance 1) reverse current maximum surge current 4) v znom at l zt z zt z zk at i zk i r at v r at t a = 25 maximum regulator current 2) type (v) (ma) max.( ? ) max.( ? ) (ma) max.( a) (v) i zsm (ma) i zm (ma) ZM4728 3.3 76 10 400 1 150 1 1375 275 zm4729 3.6 69 10 400 1 100 1 1260 252 zm4730 3.9 64 9 400 1 100 1 1190 234 zm4731 4.3 58 9 400 1 50 1 1070 217 zm4732 4.7 53 8 500 1 10 1 970 193 zm4733 5.1 49 7 550 1 10 1 890 178 zm4734 5.6 45 5 600 1 10 2 810 162 zm4735 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 4 700 0.5 10 5 605 121 zm4738 8.2 31 4.5 700 0.5 10 6 550 110 zm4739 9.1 28 5 700 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 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 70 1500 0.25 5 32.7 110 22
website: www.kingtronics.com email: info@kingtronics.com tel: (852) 8106 7033 fax: (852) 8106 7099 3 ZM4728 thru zm4761 characteristics at ta = 25 zener voltage 3) dynamic resistance 1) reverse current maximum surge current 4) v znom at l zt z zt z zk at i zk i r at v r at t a = 25 maximum regulator current 2) type (v) (ma) max.( ? ) max.( ? ) (ma) max.( a) (v) i zsm (ma) i zm (ma) zm4756 47 5.5 80 1500 0.25 5 35.8 95 19 zm4757 51 5 95 1500 0.25 5 38.8 90 18 zm4758 56 4.5 110 2000 0.25 5 42.6 80 16 zm4759 62 4 125 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 60 12 1) the dynamic resistance is derived from the 60 hz ac voltage whic h results when an ac current having an rms value equal to 10% o f the zener current (i zt or i zk ) is superimposed on i zt or i zk . dynamic resistance 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) tested with pulses tp = 20 ms. 4) the rating listed in the electrical charac teristics table is maximum peak, non-repetitiv e, reverse surge current of 1/2 square wave or equivalent sine wave pulse of 1/120 second duration superimposed on the test current i zt . breakdowm characteristics t j =constant (pulsed)
website: www.kingtronics.com email: info@kingtronics.com tel: (852) 8106 7033 fax: (852) 8106 7099 4 ZM4728 thru zm4761 breakdowm characteristics t j =constant (pulsed) power dissipation vs ambient temperature a mbient temperature: ta ( ) no te: specifications are subject to change without notice.
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