zm4728a - zm4764a zener diodes v z : 3.3 to 100v p d : 1w features : ? silicon planar power zener diodes ? for use in stabilizing and clipping circuits with higher power rating. ? standard zener voltage tolerance is 5%. ? other zener voltages and tolerances are available upon request. ? these diodes are also available in the do-41 case with type designation 1n4728a ... 1n4764a ? pb / rohs free mechanical data : * case : melf glass case * weight : 0.25 g (approximately) maximum ratings and thermal characteristics rating at 25 c ambient temperature unless otherwise specified . symbol value unit zener current see table "characteristics" maximum forward voltage at i f = 200 ma. v f 1.2 v power dissipation p d 1 1) w thermal resistance junction to ambient air r q ja 170 (1) c/w junction temperature t j -65 to + 200 c storage temperature range t s -65 to + 200 c note: (1) valid provided that electrodes are kept at ambient temperature page 1 of 2 rev. 03 : march 25, 2005 parameter dimensions in inches and ( millimeters ) melf 0.205(5.2) 0.189(4.8) f 0.102 (2.6) 0.094 (2.4) 0.022(0.55) cathode mark mounting pad layout 0.256 (6.50) ref 0.049 (1.25)min. 0.157 (4.00) max. 0.118 (3.00)min.
electrical characteristics ( ta = 25 c unless otherwise noted ) nominal zener maximum reverse maximum dc voltage leakage current zener current v z @ i zt i zt z zt @ i zt z zk @ i zk i zk i r @ v r i zm (2) (v) (ma) ( w ) ( w ) (ma) ( m a) (v) (ma) zm4728a 3.3 76.0 10 400 1.0 100 1.0 276 zm4729a 3.6 69.0 10 400 1.0 100 1.0 252 zm4730a 3.9 64.0 9.0 400 1.0 50 1.0 234 zm4731a 4.3 58.0 9.0 400 1.0 10 1.0 217 zm4732a 4.7 53.0 8.0 500 1.0 10 1.0 193 zm4733a 5.1 49.0 7.0 550 1.0 10 1.0 178 zm4734a 5.6 45.0 5.0 600 1.0 10 2.0 162 zm4735a 6.2 41.0 2.0 700 1.0 10 3.0 146 zm4736a 6.8 37.0 3.5 700 1.0 10 4.0 133 zm4737a 7.5 34.0 4.0 700 0.5 10 5.0 121 zm4738a 8.2 31.0 4.5 700 0.5 10 6.0 110 zm4739a 9.1 28.0 5.0 700 0.5 10 7.0 100 zm4740a 10 25.0 7.0 700 0.25 10 7.6 91 zm4741a 11 23.0 8.0 700 0.25 5.0 8.4 83 zm4742a 12 21.0 9.0 700 0.25 5.0 9.1 76 zm4743a 13 19.0 10 700 0.25 5.0 9.9 69 zm4744a 15 17.0 14 700 0.25 5.0 11.4 61 zm4745a 16 15.5 16 700 0.25 5.0 12.2 57 zm4746a 18 14.0 20 750 0.25 5.0 13.7 50 zm4747a 20 12.5 22 750 0.25 5.0 15.2 45 zm4748a 22 11.5 23 750 0.25 5.0 16.7 41 zm4749a 24 10.5 25 750 0.25 5.0 18.2 38 zm4750a 27 9.5 35 750 0.25 5.0 20.6 34 zm4751a 30 8.5 40 1000 0.25 5.0 22.8 30 zm4752a 33 7.5 45 1000 0.25 5.0 25.1 27 zm4753a 36 7.0 50 1000 0.25 5.0 27.4 25 zm4754a 39 6.5 60 1000 0.25 5.0 29.7 23 zm4755a 43 6.0 70 1500 0.25 5.0 32.7 22 zm4756a 47 5.5 80 1500 0.25 5.0 35.8 19 zm4757a 51 5.0 95 1500 0.25 5.0 38.8 18 zm4758a 56 4.5 110 2000 0.25 5.0 42.6 16 zm4759a 62 4.0 125 2000 0.25 5.0 47.1 14 zm4760a 68 3.7 150 2000 0.25 5.0 51.7 13 ZM4761A 75 3.3 175 2000 0.25 5.0 56.0 12 zm4762a 82 3.0 200 3000 0.25 5.0 62.2 11 zm4763a 91 2.8 250 3000 0.25 5.0 69.2 10 zm4764a 100 2.5 350 3000 0.25 5.0 76.0 9.0 notes: (1) the zener impedance is derived from the 1khz 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 (2) valid provided that electrodes at a distance of 10mm from case are kept at ambient temperature ( 3 ) the type number listed have a standard tolerance on the nominal zener voltage of 5 %. page 2 of 2 rev. 03 : march 25, 2005 type maximum zener impedance (1)
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