1N4148-LFR page: 1 frontier electronics corp. 667 e. cochran street, simi valley, ca 93065 tel: (805) 522-9998 fax: (805) 522-9989 e-mail: frontiersales@frontierusa.com web: http://www.frontierusa.com silicon epitaxial planar diode 1N4148-LFR features z fast switching z small size z rohs mechanical data z case: glass, do35, dimensions in millimeters z leads: solderable per mil-std-202, method 208 z polarity: cathode indicated by color band z weight: 0.13 grams ratings symbol 1N4148-LFR units reverse voltage v r 75 v peak reverse voltage v rm 100 v rectified current (average) half wave rectification with resist load at t amb =25 oc and f 50hz (note 1) i o 150 ma surge forward current at t<1 s and t j =25 oc i fsm 500 ma power dissipation at t amb =25 oc p tot 500 mw junction temperature t j 200 oc storage temperature range t s - 55 to + 200 oc electrical characteristics (a t t a =25 c unless otherwise noted) characteristics @ t j 25 oc symbol min typ max units forward voltage at i f =10ma v f - - 1 v leakage current at v r =20v at v r =75v at v r =20v t j =150 oc i r i r i r - - - - - - 25 5 50 na a a reverse breakdown voltage tested with 100 a pulses v r 100 - - v capacitance at v f =v r =0 c tot - - 4 pf voltage rise when switching on tested with 50ma forward pulses tp=0.1 s rise time 30ns f p =5 to 100 khz v fr - - 2.5 v reverse recovery time from i f =10ma to i r =1ma v r =6v r l =100 t rr - - 4 ns thermal resistance junction to ambient air (note 1) r tha - - 0.35 k / mw rectification efficiency at f =100 mhz v rf =2v n v 0.45 - - - note: 1. leads kept at ambient temp. at 8mm length 0.52 ? 27.5 min 1.9 ?
1N4148-LFR page: 1 figure 3. typical thermal resistance versus lead length 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 =25oc i z (ms)=0.1i z (do) f=60h z 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) 50%of breakdownbias 0vbias 0vbias fig.1a- range for units to 12 volts +12 +10 +8 +6 +4 +2 0 -2 -4 v z , temperature coefficient ( mv/oc ) 2 3 4 5 6 7 8 9 10 11 12 v z , zener voltage (volts) range v z @i zt fig.1b- range for units to 12 to 100 volts 100 70 50 30 20 10 7 5 3 2 1 v z , temperature coefficient ( mv/oc ) 10 20 30 50 70 100 v z , zener voltage (volts) range v z @i zt 175 150 125 100 75 50 25 0 jl, junction to lead thermal resistance (mv/oc/w) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 l, lead length to heat sink (inches) figure 2. temperature coefficients (-55oc to+150oc temperat ure change; 90% of the units are in the ranges indicated.) +6 +4 +2 0 -2 -4 v z , temperature coefficient ( mv/oc ) 3 4 5 6 7 8 20ma 1ma 0.01ma v z @i z t a =25oc note:below 3 volts aand aboce 8 volts changes in zener current do not effect temperature coefficients v z , zener voltage ( volts ) 1.25 1.0 0.75 0.5 0.25 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)
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