surface mount zener diodes mechanical data features: weitron http://www .weitron.com.tw sma sma outline dimension unit:mm a d e b h j g c 4.00 4.60 2.20 2.92 1.27 1.63 d e 0.15 0.31 4.48 5.59 g 0.76 1.52 h 1.70 2.62 j 0.10 0.20 a b c sma dim min max sma5921b series 1/3 23-oct-06 * 1.5w power dissipation * for surface mounted applications * zener breakdown voltage range 6.8v to 68v * case: molded plastic sma/do-214ac * epoxy: ul 94v-0 rate ?ame retardant * terminals: solderable per mil-std-750 method 2026 * polarity: cathode band * mounting position: any * weight: 0.064 gram surface mount zener diodes 1.5 watts lead(pb)- f r ee p b
w e i t r o n h t t p : / / w w w . w e i t r o n . c o m . t w 2/3 23-oct-06 sma5921b series maximum ratings (t a =25 c unless o t herwise no t ed) characteristics symbol unit c c p d t stg v alue 1.5 150 w tj surge part no. vz iz t z zt z zk i zk current ( v ) ( ma ) (?) (?) ( ma ) (v) ( ma ) sma5921b 6.8 55.1 2.5 200 1.0 2.5 5.2 221 SMA5922B 7.5 50.0 3.0 400 0.5 2.5 6.0 200 sma5923b 8.2 45.7 3.5 400 0.5 2.5 6.5 183 sma5924b 9.1 41.2 4.0 500 0.5 2.5 7.0 165 sma5925b 10 37.5 4.5 500 0.25 2.5 8.0 150 sma5926b 11 34.1 5.5 550 0.25 2.5 8.4 136 sma5927b 12 31.2 6.5 550 0.25 0.5 9.1 125 sma5928b 13 28.8 7.0 550 0.25 0.5 9.9 115 sma5929b 15 25.0 9.0 600 0.25 0.5 11.4 100 sma5930b 16 23.4 10 600 0.25 0.5 12.2 94 sma5931b 18 20.8 12 650 0.25 0.5 13.7 83 sma5932b 20 18.7 14 650 0.25 0.5 15.2 75 sma5933b 22 17.0 17.5 650 0.25 0.5 16.7 68 sma5934b 24 15.6 19 700 0.25 0.5 18.2 63 sma5935b 27 13.9 23 700 0.25 0.5 20.6 56 sma5936b 30 12.5 26 750 0.25 0.5 22.8 50 sma5937b 33 11.4 33 800 0.25 0.5 25.1 45 sma5938b 36 10.4 38 850 0.25 0.5 27.4 42 sma5939b 39 9.6 45 900 0.25 0.5 29.7 38 sma5940b 43 8.7 53 950 0.25 0.5 32.7 35 sma5941b 47 8.0 67 1000 0.25 0.5 35.8 32 sma5942b 51 7.3 70 1100 0.25 0.5 38.8 29 sma5943b 56 6.7 86 1300 0.25 0.5 42.6 27 sma5944b 62 6.0 100 1500 0.25 0.5 47.1 24 sma5945b 68 5.5 120 1700 0.25 0.5 51.7 22 electrical characteristic (ta=25 c) i r v r suffix b for 5% (a) notes : power dissipation 2 10 a half sine-wave superimposed on rated load 1 (jedec method) i fsm (1) measurd on 8.3ms, single half-sine wave or equivalent square wave, duty cycle = 4 pulses per minute maximum. (2) mounted on 5.0mm 2(.013mm thick) land areas. maximun junc t ion tempera t ure s t orage tempera t ure range -55 t o +150
weitron http://www .weitron.com.tw sma5921b series 3/3 23-oct-06 p d , maximum power dissipation (watts) v z , temperature coefficient (mv/c) fig 3. zener voltage-10 to 12 volts v z , temperature coefficient (mv/c) 0 25 75 125 50 100 150 175 4 5 1.5 1.0 0.5 0 0 20 60 40 80 100 120 140 160 180 200 120 100 60 80 20 40 0 t l ,leadtemperature(c) v z , zenervoltage(volts) vz@izt fig 1. steady state powerderating -4 -2 0 2 6 8 4 3 4 5 6 7 8 9 10 11 12 v z ,zenervoltage(volts) fig 2. zener voltage-to 12 volts vz@izt 1 10 100 1000 0.5 1 1.0 100 100 fig 4. effect of zener current i z , zener test current (ma) t j - 25c iz( m s ) = 0 . 1 iz( d c ) v z = 150v 91v 62v 22v 12v 6. 8 v zz, dynamic impedance (ohms) 20 0 10 0 70 50 30 20 10 7 5 3 2 5 7 10 2 0 30 50 7 0 10 0 10ma 20ma 1k 500 300 200 100 50 30 20 10 0.1 0.2 0.3 5 1 2 3 5 0 20 50 100 100 50 30 20 10 5 3 2 1 0.5 0.3 0.2 0.1 0 1 2 3 4 5 6 7 8 9 10 100 50 30 20 10 5 3 2 1 0.5 0.3 0.2 0.1 0 10 20 30 40 50 60 70 80 90 100 vz, zener voltage (volts) fig.7 vz, zener voltage (volts) p w , pulse width (ms) fig.8 vz, zener voltage (volts) fig 5. vz = 6.8 thru10volts fig 6.vz=12 thru 82 volts zz, dynamic impedance (ohms) iz, zener current (ma) iz, zener current (ma) ppk, peak surge power (watts) iz(dc) =1ma iz(ms) = 0.1iz(dc) rectangular nonrepetitive waveform tj = 25oc prior to initial pulse typical characteristi cs
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