digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 MU4891-mu4894 silicon unijunction transistor maximum ratings rating symbol value unit power dissipation (1) p d 300 mw rms emitter current i e 50 ma peak pulse emitter current (2) i e 1.0 amps emitter reverse voltage v b2e 30 volts storage temperature range t stg -65 to 150 c note 1: derate 3mw/c increase in ambient temperature. the total power dissipation must be limited by the external circuitry. v b2b1 = ( r bb p d ) note 2: capacitance discharge must fall to 0.37 amp within 3.0ms and prr 10pps. electrical characteristics (t a = 25c unless otherwise specified) parameter symbol min typ max unit intrinsic standoff ratio (v b2b1 = 10v) (1) mu4892 MU4891, mu4893 mu4894 0.51 0.55 0.74 - - - 0.69 0.82 0.86 - interbase resistance (v b2b1 = 3v, i e = 0) MU4891, mu4892 mu4893, mu4894 r bb 4.0 4.0 7.0 7.0 9.1 12.0 k ? interbase resistance te mperature coefficient (v b2b1 = 3v, i e = 0, t a = -65 to 100c) r bb 0.1 - 0.9 %/c emitter saturation voltage (v b2b1 = 10v, i e = 50ma) (2) v eb1(sat) - 2.5 4.0 volts modulated interbase current (v b2b1 = 10v, i e = 50ma) i b2(mod) 10 15 - ma emitter reverse current (v b2e = 30v, i b1 = 0) i eb2o - 5.0 10 na peak point emitter current (v b2b1 = 25v) MU4891 mu4892, mu4893 mu4894 i p - - - 0.6 0.6 0.6 5.0 2.0 1.0 a valley point current (v b2b1 = 20v, r b2 = 100ohms) (2) MU4891, mu4893, mu4894 mu4892 i v 2.0 2.0 4.0 3.0 - - ma base-one peak pulse voltage (3) figure 3 MU4891, mu4892, mu4894 mu4893 v ob1 3.0 6.0 5.0 8.0 - - volts note 1: intrinsic standoff ratio: = (v p -v eb1 )/v b2b1 , where v p = peak point emitter voltage , v b2b1 = interbase voltage, v eb1 = emitter to base one junction diode drop ( 0.5v @ 10a). note 2: pw 300s, duty cycle 2% to avoid internal heating due to interbase modulation which may result in erroneous readings note 3: base one peak pulse voltage is used to ensure minimum pulse amplitude for applications in scr firing circuits and other types of pulse circuits. sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20121009
digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 MU4891-mu4894 silicon unijunction transistor to-92 case to-92 dim inches millimeters min max min max a 0.175 0.205 4.45 5.2 b 0.17 0.21 4.32 5.33 c 0.125 0.165 3.18 4.19 d 0.016 0.021 0.407 0.533 g 0.045 0.055 1.15 1.39 h 0.095 0.105 2.42 2.66 j 0.015 0.02 0.39 0.5 k 0.5 - 12.7 - l 0.25 - 6.35 - n 0.08 0.105 2.04 2.66 p - 0.1 - 2.54 r 0.115 - 2.93 - v 0.135 - 3.43 - pin 1: base 1 pin 2: emitter pin 3: base 2 available non-rohs (standard) or rohs compliant (add pbf suffix). available as ?hr? (high reliability) screened per mil-prf- 19500, jantx level. add ?hr? suffix to base part number. sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20121009
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