1watt melf zener diode features ! low cost ! small size mechanical data ! case U melf ! terminals solderable per mil-std -202, method 208 ! polarity color band denotes cathode ! m oun t ing p o s i t i on a n y ! w e i g h t 0.15 g r a m s maximum ratings and electrical characteristics ratings at 25 c ambient temperature unless otherwise specified storage and operating temperature range -55 to + 150 electrical characteristics (ta=25 unless otherwise noted) vf=1.2v max, if = 200ma for all types maximum zener impedance leakage current jedec type no nominal zener voltage test current z zt @ i zt ohms z zk @ i zk ohms i zk ma i r a max v r volts surge current zs 4728a zs 4729a zs 4730a zs 4731a zs 4732a zs 4733a zs 4734a zs 4735a zs 4736a zs 4737a zs 4738a zs 4739a zs 4740a zs 4741a zs 4742a zs 4743a zs 4744a zs 4745a zs 4746a zs 4747a zs 4748a zs 4749a zs 4750a zs 4751a zs 4752a zs 4753a 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1 10 11 12 13 15 16 18 20 22 24 27 30 33 36 76 69 64 58 53 49 45 41 37 34 31 28 25 23 21 19 17 15.5 14 12.5 11.5 10.5 9.5 8.5 7.5 7.0 10 10 9 9 8 7 5 2 3.5 4 4.5 5 7 8 9 10 14 16 20 22 23 25 35 40 45 50 400 400 400 400 500 550 600 700 700 700 700 700 700 700 700 700 700 700 750 750 750 750 750 1000 1000 1000 1 1 1 1 1 1 1 1 1 0.5 0.5 0.5 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 100 100 50 10 10 10 10 10 10 10 10 10 10 5 5 5 5 5 5 5 5 5 5 5 5 5 1 1 1 1 1 1 2 3 4 5 6 7 7.6 8.4 9.1 9.9 11.4 12.2 13.7 15.2 16.7 18.2 20.6 22.8 25.1 27.4 1380 1260 1190 1070 970 890 810 730 660 605 550 500 454 414 380 344 304 285 250 225 205 190 170 150 135 125 note U suffix "a" for 5 0.205(5.2) 0.189(4.8) 0.012(0.3) typ. 0.110(2.8) 0.094(2.4) 0.181(4.6) 0.165(4.2) 0.075(1.9) 0.067(1.7) 0.024(0.60) 0.034(0.85) 0.024(0.60) 0.034(0.85) sma zs4728a thru zs4753a http:// www.wej.cn e-mail:wej@yongerjia.com wej electronic co. r o hs wej electronic co.,ltd
ratin g s and c h aracteristic curves zs 4728a t h ru zs 4753a figure 2. temperature coefficients (-55 to+150 temperature change;90% of the units are in the ranges indicated.) figure 3. typical thermal resistance versus lead figure 4. effect of zener current 400 300 200 100 50 20 10 8 4 c, capacitance ( p f) 1 2 5 10 20 50 100 v z , nominal v z (volts) 1000 700 500 200 100 70 50 20 10 7 5 2 1 z z dynamic impedance (ohns) 1 2 3 5 7 10 20 30 50 70 100 v z, zener current (ma) i z =1ma 5ma 20ma t j =25 i z (ms)=0.1i z (do) f=60h z 50%of breakdownbias 0vbias 0vbias 175 150 125 100 75 50 25 0 jl, jumction to lead thermal 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10 +6 +4 +2 0 -2 -4 v z , temperature coefficient ( mv/ ) 3 4 5 6 7 8 20ma 1ma 0.01ma v z i z t a =25 note:below 3 volts aand aboce 8 volts changes in zener current do not fig.1a- range for units to 12 volts +12 +10 +8 +6 +4 +2 0 -2 -4 v z , temperature coefficient ( mv/ ) 2 3 4 5 6 7 8 9 10 11 12 v z , zener voltage (volts) fig.1b- range for units to 12 to 100 100 70 50 30 20 10 7 5 3 2 1 v z , temperature coefficient ( mv/ ) 10 20 30 50 70 100 v z , zener voltage (volts) range range v z i zt v z i zt l, lead length to heat sink (inches) v z , zener voltage ( volts ) 1.2 5 1.0 0.7 5 0.5 figure. 7 - power temperature derating curve 0 20 40 60 80 100 120 140 160 180 200 t l , lead temperature ( o c) p d ,maximum dissipation (watts) zs4728a thru zs4753a http:// www.wej.cn e-mail:wej@yongerjia.com wej electronic co. r o hs wej electronic co.,ltd
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