digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N5431 pn sili con annular unijunction transitor maximum ratings (t a = 25c unless otherwise noted) rating symbol value unit rms power dissipation (1) p d 360 mw rms emitter current i e 50 ma peak pulse emitter current (2) i e 1.5 amp emitter reverse voltage v b2e 30 volts interbase voltage (3) v b2b1 35 volts operating junction temperature range t j -65 to +125 c storage temperature range t stg -65 to +200 c 1. derate 3 mw/c increase in ambient temperature. 2. duty cycle 1%, prr = 10 pps. 3. based upon power dissipation at t a = 25c. electrical characteristics (t a = 25c unless otherwise noted) characteristic symbol min max unit intrinsic standoff ratio (1) (v b2b1 = 10v) ? 0.72 0.80 - interbase resistance (v b2b1 = 3v, i e = 0) r bb 6 8.5 k ? interbase resistance temperature coefficient (v b2b1 = 3v, i e = 0, t a = 0 to 100c) r bb 0.4 0.8 %/c emitter saturation voltage (2) (v b2b1 = 10v, i e = 50ma) v eb1(sat) - 3 volts modulated interbase current (v b2b1 = 10v, i e = 50ma) i b2(mod) 5 30 ma emitter reverse current (v b2e = 30v, i b1 = 0) i eb2o - 10 na peak point emitter current (v b2b1 = 25v) (v b2b1 = 4v) i p - - 0.4 4 a valley point current (2) (v b2b1 = 20v, r b2 = 100ohms) i v 2 - ma base one peak pulse voltage (v bb = 4v) v ob1 1 - volts 1. ? . intrinsic standoff ratio is defined in terms of the peak point voltage, v p , by means of the equation: v p = ? v b2b1 + v f , where v f is about 0.45v at 25c @ i f = 10a and decreases with temperature at about 2.5 mv/c. components r 1 , c 1 and the ujt form a relaxation oscillator, the remaining circuitry serves as a peak voltage detector. the forward drop of diode d 1 compensates for v f . to use, the ?cal? button is pushed, and r 3 is adjusted to make the current meter, m 1 , read full scale. when the ?cal? button is released, the value of ? is read directly from the meter, if full scale on the meter reads 1. 2. pw = 300s, duty cycle 2% to avoid internal heating, which may result erroneous readings. sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20121019
digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N5431 pn sili con annular unijunction transitor 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. 20121019
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