december 2005 / b http://takcheong.com 1 licensed by on semiconductor , a trademark of semiconductor components industries, llc for zener technology and products . tak cheon g ? 500 mw do-35 hermetically sealed glass zener voltage regulators maximum ratings (note 1) rating symbol value units maximum steady state power dissipation @ tl 75 , lead length = 3/8? derate above 75 p d 500 4.0 mw mw/ operating and storage temperature range t j , t stg -65 to +200 c note 1: some part number series have lower jedec registered ratings. specification features: ? zener voltage range = 2.4v to 12v ? esd rating of clas 3 (>6 kv) per human body model ? do-35 package (do-204ah) ? double slug type construction ? metallurgical bonded construction specification features: case : double slug type, hermetically sealed glass finish : all external surfaces are corrosion re sistant and leads are readily solderable polarity : cathode indicated by polarity band mounting: any maximum lead temperature for soldering purposes 230 , 1/16? from the case for 10 seconds ordering information device package quantity 1nxxxxa axial lead 3000 units / box 1nxxxxarl axial lead 5000 units / tape & reel 1nxxxxarl2* axial lead 5000 units / tape & reel 1nxxxxarr1 ! lead form 3000 units / radial tape & reel 1nxxxxarr2 i lead form 3000 units / radial tape & reel 1nxxxxata axial lead 5000 un its / tape & ammo 1nxxxxata2* axial lead 5000 units / tape & ammo 1nxxxxara1 ! axial lead 3000 un its / radial tape & ammo 1nxxxxara2 i axial lead 3000 un its / radial tape & ammo * the ?2? suffix refer to 26mm tape spacing. ! ?1?: polarity band up with cathode lead off first. i ?2?: polarity band down with cathode lead off first. 1n4370a through 1n759a series cathode anode l = logo 437xa = 1n437xa device code l 43 7x a devices listed in bold italic are tak cheong preferred devices. preferred devices are recommended choices for future use and best overall value. axial lead do35 l = logo 7xxa = 1n7xxa device code l 7x xa
1n4370a through 1n759a series http://www.takcheong.com 2 electrical characteristics (t a = 25oc unless otherwise noted, v f = 1.5 v max @ i f = 200ma for all types) symbol parameter v z reverse zener voltage @ i zt i zt reverse zener current z zt maximum zener impedance @ i zt i zm maximum dc zener current i r reverse leakage current @ v r v r reverse voltage i f forward current v f forward voltage @ i f electrical characteristics (t a = 25oc unless otherwise noted, v f = 1.5 v max @ i f = 200ma for all types) zener voltage (note 3.) i r @ v r = 1v v z (volts) @ i zt z zt (note 4.) @ i zt i zm (note 5.) t a = 25oc t a = 150oc device (note 2.) device marking min nom max (ma) ( ? ?? ? ) (ma) ( ? a) ( ? a) 1n4370a 1n4370a 2.28 2.4 2.52 20 30 150 100 200 1n4271a 1n4271a 2.57 2.7 2.84 20 30 135 75 150 1n4372a 1n4372a 2.85 3 3.15 20 29 120 50 100 1n746a 1n746a 3.14 3.3 3.47 20 28 110 10 30 1n747a 1n747a 3.42 3.6 3.78 20 24 100 10 30 1n748a 1n748a 3.71 3.9 4.10 20 23 95 10 30 1n749a 1n749a 4.09 4.3 4.52 20 22 85 2 30 1n750a 1n750a 4.47 4.7 4.94 20 19 75 2 30 1n751a 1n751a 4.85 5.1 5.36 20 17 70 1 20 1n752a 1n752a 5.32 5.6 5.88 20 11 65 1 20 1n753a 1n753a 5.89 6.2 6.51 20 7 60 0.1 20 1n754a 1n754a 6.46 6.8 7.14 20 5 55 0.1 20 1n755a 1n755a 7.13 7.5 7.88 20 6 50 0.1 20 1n756a 1n756a 7.79 8.2 8.61 20 8 45 0.1 20 1n757a 1n757a 8.65 9.1 9.56 20 10 40 0.1 20 1n758a 1n758a 9.50 10 10.5 20 17 35 0.1 20 1n759a 1n759a 11.4 12 12.6 20 30 30 0.1 20 2. tolerance and type number designation (v z ) the type numbers listed have a standard tolerance on the nominal zener voltage of 5%. 3. zener voltage (v z ) measurement nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (t l ) at 30 c 1 c and 3/8? lead length. 4. zener impedance (z z ) derivation z zt and z zk are measured by dividing the ac voltage drop across the device by the ac current applied. the specified limits are for i z(ac) = 0.1 i z(dc) with ac frequency = 60hz. 5. maximum zener current ratings (i zm ) values shown are based on the jedec rating of 400mw where the actual zener voltage (v z ) is known at the operating point, the zener current may be increased and is limited by the derating curve.
1n4370a through 1n759a series http://www.takcheong.com 3 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 140 160 180 200 t l , lead temperature ( c) figure 1. steady state power derating heat sinks 3/8" 3/8" p d , maximum steady state power dissipation (watts)
1n4370a through 1n759a series http://www.takcheong.com 4 application note - zener voltage since the actual voltage available from a given zener diode is temperature dependent, it is necessary to determine junction temperature under any set of operating conditions in order to calculate its value. the following procedure is recommended: lead temperature, t l , should be determined from: t l = la p d + t a . la is the lead-to-ambient thermal resistance ( c/w) and p d is the power dissipation. the value for la will vary and depends on the device mounting method. la is generally 30 to 40 c/w for the various clips and tie points in common use and for printed circuit board wiring. the temperature of the lead can also be measured using a thermocouple placed on the lead as close as possible to the tie point. the thermal mass connected to the tie point is normally large enough so that it will not significantly respond to heat surges generated in the diode as a result of pulsed operation once steady-state conditions are achieved. using the measured value of t l , the junction temperature may be determined by: t j = t l + ? t jl . ? t jl is the increase in junction temperature above the lead temperature and may be found from figure 2 for dc power: ? t jl = jl p d . for worst-case design, using expected limits of i z , limits of p d and the extremes of t j ( ? t j ) may be estimated. changes in voltage, v z , can then be found from: ? v = vz t j . vz , the zener voltage temperature coefficient, is found from figures 4 and 5. under high power-pulse operation, the zener voltage will vary with time and may also be affected significantly by the zener resistance. for best regulation, keep current excursions as low as possible. surge limitations are given in figure 7. they are lower than would be expected by considering only junction temperature, as current crowding effects cause temperatures to be extremely high in small spots, resulting in device degradation should the limits of figure 7 be exceeded. ll 500 400 300 200 100 0 0 0.2 0.4 0.6 0.8 1 2.4-60 v 62-20 0 v l , lead length to heat sink (inch) jl , junction t o lead therma l resistanc e ( c/w) figure 2. typical thermal resistance typical leakage current at 80% of nominal breakdown voltage +2 5 c +12 5 c 1000 7000 5000 2000 1000 700 500 200 100 70 50 20 10 7 5 2 1 0.7 0.5 0.2 0.1 0.07 0.05 0.02 0.01 0.007 0.005 0.002 0.001 34 5 6 7 8 9101112 v z , nominal zener voltage (volts ) i , leakage current ( a) r figure 3. typical leakage current 13 14 15
1n4370a through 1n759a series http://www.takcheong.com 5 +12 +10 +8 +6 +4 +2 0 -2 -4 89 v z , zener voltage (volts) figure 4a. range for units to 12 volts v z @i zt (note 2) range temper a ture coefficients (-5 5 c to +15 0 c temperature range; 90% of the units are in the ranges indicated.) 100 70 50 30 20 10 7 5 3 2 1 2 6 1 0 2 0 3 0 5 0 7 0 100 v z , zener voltage (volts) figure 4b. range for units 12 to 100 volts range v z @i z (note 2) 120 130 140 150 160 170 180 190 200 200 180 160 140 120 100 v z , zener voltage (volts) figure 4c. range for units 120 to 200 volts v z @ i zt (note 2) +6 +4 +2 0 -2 -4 34 v z , zener vo l t age (vo l ts) figure 5. effect of zener current note: below 3 volts and above 8 vol ts note: changes in zener current do not note: affect temperature coefficients 1ma 0.01ma v z @ i z t a = 2 5 c 1000 c, cap acit ance (pf) 500 200 100 50 20 10 5 2 1 1 2 5 10 20 50 100 v z , zener voltage (volts) figure 6a. typical capacitance 2.4-100 volts t a = 2 5 c 0v bias 1v bias 50% of v z bias 100 70 50 30 20 10 7 5 3 2 1 120 140 160 180 190 200 220 v z , zener voltage (volts) figure 6b. typical capacitance 120-200 volts t = 2 5 c 1 volt bias 50% of v bias 0 bias v z , tempera ture coefficient (mv/ c) 20ma c, cap acit ance (pf) v z , temperature coefficient (mv/ c) v z , temperature coefficient (mv/ c) v z , tempera ture coefficient (mv/ c) 3 45 710 11 12 5 6 7 8
1n4370a through 1n759a series http://www.takcheong.com 6 100 70 50 30 20 10 7 5 3 2 1 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 20 50 100 200 500 1000 p p k , peak surge power ( w a tts) p w , pulse width (ms) 5% duty cycle 10% duty cycle 20% duty cycle 11v-91v nonrepetitive 1.8v-10v nonrepetitive rect angular waveform t j = 25 c prior to initial pulse figure 7a. maximum surge power 1.8-91 volts 1000 700 500 300 200 100 70 50 30 20 10 7 5 3 2 1 0.01 0.1 1 10 100 1000 p pk , peak surge power (watts) pw, pulse width (ms) figure 7b. maximum surge power do- 35 100-200volts 1000 500 200 100 50 20 10 1 2 5 0.1 0.2 0.5 1 2 5 10 20 50 100 i z , zener current (ma) figure 8. effect of zener current on zener impedance z z , dynamic impedance (ohms) z z , dynamic impedance (ohms) 1000 700 500 200 100 70 50 20 10 7 5 2 1 1 2 3 5 7 10 20 30 50 70 100 v z , zener voltage (volts) figure 9. effect of zener v oltage on zener impedance figure 10. t ypical forward characteristics rect angular waveform, tj = 25 c 100-20 0 vo l ts nonrepetitive t j = 2 5 c i z (rms) = 0.1 i z (dc) f = 60hz i z =1ma 5ma 20ma t j = 2 5 c i z (rms ) = 0.1 i z (dc) f = 60 hz v z = 2.7v 47v 27v 6.2v v f , for ward voltage (volts) 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1000 500 200 100 50 20 10 5 2 1 i f , for ward current (ma) minimum maximum 150 c 75 c 0 c 25 c
1n4370a through 1n759a series http://www.takcheong.com 7 figure 1 1. zener voltage versus zener current - v z = 1 thru 16 volts v z , zener voltage (volts) i z , zener current (ma) 20 10 1 0.1 0.01 12 5 78910111213141516 t a = 2 5 c figure 12. zener voltage versus zener current - v z = 15 thru 30 volts v z , zener vo l t age (vo l ts ) 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 10 1 0.1 0.01 t a = 2 5 c i z , zener current (ma) 6 34
1n4370a through 1n759a series http://www.takcheong.com 8 figure 13. zener voltage versus zener current - v z = 30 thru 105 volts v z , zener voltage (volts) 10 1 0.1 0.01 30 35 40 45 50 55 60 70 75 80 85 90 95 100 figure 14. zener voltage versus zener current - v z = 110 thru 220 volts v z , zener voltage (volts) 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 10 1 0.1 0.01 t a = 2 5 65 105 i z , zener current (ma) i z , zener current (ma)
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