dated : 13/06/2007 ? semtech electronics ltd. ( subsidiary of sino-tech internati onal holdings limited, a company listed on the hong kong stock exchange, stock code: 724 ) 1N957...1n978 silicon planar zener diodes standard zener voltage tolerance is 20%. add suffix "a" for 10% tolerance and suffix "b" for 5% tolerance. other tolerances, non standard and higher zener voltages are upon request. absolute maximum ratings (t a = 25 o c) parameter symbol value unit power dissipation p tot 500 1) mw junction temperature t j 175 o c storage temperature range t s - 65 to + 175 o c 1) valid provided that leads are kept at ambient temperature at a distance of 8 mm from case characteristics at t a = 25 o c parameter symbol max. unit thermal resistance junction to ambient air r tha 0.3 1) k/mw forward voltage at i f = 200 ma v f 1.5 v 1) valid provided that leads are kept at ambient temperature at a distance of 8 mm from case. max. 3.9 max. 1.9 glass case do-35 max. 0.5 min. 27.5 min. 27.5 xxx cathode band part no. st "st" brand dimensions in mm black black black
dated : 13/06/2007 ? semtech electronics ltd. ( subsidiary of sino-tech internati onal holdings limited, a company listed on the hong kong stock exchange, stock code: 724 ) 1N957...1n978 characteristics at t a = 25 o c maximum reverse leakage current 2) zener voltage range 1) maximum dynamic resistance test-voltage (v r ) v znom l zt r zjt r zjk at i zk i r suffix a suffix b type v ma ? ? ma a v v maximum regulator current i zm (ma) 1N957 6.8 18.5 4.5 700 1 150 4.9 5.2 47 1n958 7.5 16.5 5.5 700 0.5 75 5.4 5.7 42 1n959 8.2 15 6.5 700 0.5 50 5.9 6.2 38 1n960 9.1 14 7.5 700 0.5 25 6.6 6.9 35 1n961 10 12.5 8.5 700 0.25 10 7.2 7.6 32 1n962 11 11.5 9.5 700 0.25 5 8 8.4 28 1n963 12 10.5 11.5 700 0.25 5 8.6 9.1 26 1n964 13 9.5 13 700 0.25 5 9.4 9.9 24 1n965 15 8.5 16 700 0.25 5 10.8 11.4 21 1n966 16 7.8 17 700 0.25 5 11.5 12.2 19 1n967 18 7 21 750 0.25 5 13 13.7 17 1n968 20 6.2 25 750 0.25 5 14.4 15.2 15 1n969 22 5.6 29 750 0.25 5 15.8 16.7 14 1n970 24 5.2 33 750 0.25 5 17.3 18.2 13 1n971 27 4.6 41 750 0.25 5 19.4 20.6 11 1n972 30 4.2 49 1000 0.25 5 21.6 22.8 10 1n973 33 3.8 58 1000 0.25 5 23.8 25.1 9 1n974 36 3.4 70 1000 0. 25 5 25.9 27.4 8.5 1n975 39 3.2 80 1000 0. 25 5 28.1 29.7 7.8 1n976 43 3 93 1500 0.25 5 31 32.7 7 1n977 47 2.7 105 1500 0. 25 5 33.8 35.8 6.4 1n978 51 2.5 125 1500 0. 25 5 36.7 38.8 5.9 1) tested with pulses tp = 20 ms 2) valid provided that leads are k ept at ambient temperature at a distance of 8 mm from case. ambient temperature: ta ( c) o 0 25 100 150 0 100 200 300 power dissipation: ptot (mw) 400 500 200 power derating curve
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