digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N4870-2n4871 pn unijunction transistors maximum ratings rating symbol value unit rms power dissipation (1) p d 300 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 ? v b2b1 35 volts operating junction temperature range t j -55 to 125 c storage temperature range t stg -55 to 150 c note 1: derate 3.04mw/c increase in ambient temperature. note 2: duty cycle 1%. prr = 10pps. ? base upon power dissipation at t a = 25c. electrical characteristics (t a = 25c unless otherwise noted) characteristic symbol min typ max unit intrinsic standoff ratio (v b2b1 = 10v) (1) 2N4870 2n4871 0.56 0.70 - - 0.75 0.85 - interbase resistance (v b2b1 = 3.0v, i e = 0) r bb 4.0 6.0 9.1 kohms interbase resistance te mperature coefficient (v b2b1 = 3.0v, i e = 0, t a = -65 to 125c r bb 0.1 - 0.9 %/c emitter saturation voltage (v b2b1 = 10v, i e = 50ma) (2) v eb1(sat) - 2.5 - volts modulated interbase current (v b2b1 = 10v, i e = 50ma) i b2(mod) - 15 - ma emitter reverse current (v b2e = 30v, i b1 = 0) i eb20 - 0.005 1.0 a peak point emitter current (v b2b1 = 25v) i p - 1.0 5.0 a valley point current (v b2b1 = 20v, r b2 = 100ohms) (2) 2N4870 2n4871 i v 2.0 4.0 5.0 7.0 - - ma base-one peak pulse voltage 2N4870 2n4871 v ob1 3.0 5.0 6.0 8.0 - - volts note 1: intrinsic standoff ration: vp = vb2b1+ vf, where vf is about 0.49v at 25c @ if = 10a and decreases with temperature at about 2.5mv/c. components r1, c1, an d the ujt form a relaxation oscillator; the remaining circuitry serves as a peak ?voltage detector. the forward drop of diode d1 compensates for vr. to use, the ?cal? button is pushed and r3 is adjusted to make the current meter, m1, 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 1.0. note 2: use pulse techniques: pw 300s duty cycle 2% to avoid internal heating due to interbase modulation which may result in erroneous readings. 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. 20120705
digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N4870-2n4871 pn unijunction transistors inches millimeters dim min max min max a 0.170 0.210 4.320 5.330 b 0.175 0.205 4.440 5.210 c 0.125 0.165 3.180 4.190 d 0.016 0.022 0.410 0.560 f 0.016 0.019 0.410 0.480 g 0.045 0.055 1.140 1.400 h - 0.100 - 2.540 j 0.095 0.105 2.410 2.670 k 0.500 - 12.700 - l 0.250 - 6.350 - n 0.080 0.115 2.030 2.920 p 0.115 - 2.920 - r 0.135 - 3.430 - s 0.014 0.016 0.360 0.410 to-92 pin 1: base 1 pin 2: emitter pin 3: base 2 sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20120705
digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N4870-2n4871 pn unijunction transistors sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20120705
digitron semiconductors 144 market street kenilworth nj 07033 usa phone +1.908.245-7200 2N4870-2n4871 pn unijunction transistors sales@digitroncorp.com fax +1.908.245-0555 www.digitroncorp.com rev. 20120705
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