01/99 b-41 ifn421, IFN422, ifn423 dual n-channel silicon junction field-effect transistor absolute maximum ratings at t a = 25?c device dissipation (derate 3.2 mw/c to 50c) 400 mw total device dissipation (derate 6 mw/c to 150c) 750 mw storage temperature range C 65c to 200c toe78 package see section g for outline dimensions pin configuration 1 source 1, 2 drain 1, 3 gate 1, 4 case, 5 source 2, 6 drain 2, 7 gate 2, 8 omitted at 25c free air temperature: ifn421, IFN422, ifn423 process nj01 static electrical characteristics min typ max unit test conditions gate source breakdown voltage v (br)gss C 40 C 60 v i g = C 1 a, v ds = ? v gate to gate breakdown voltage bv g1g2 40 v i g = C 1 a, i d = ? a, i s = ? a gate reverse current i gss C 1 pa v gs = C 20 v, v ds = ?v C 1 na v gs = C 20 v, v ds = ?v t a = +125c gate operating current i g C 0.25 pa v ds = 10 v, i d = 30 a C 250 pa v ds = 10 v, i d = 30 a t a = +125c gate source cutoff voltage v gs(off) C 0.4 C 2 v v ds = 10 v, i d = 1 na gate source voltage v gs C 1.8 v v ds = 10 v, i d = 30 a drain saturation current (pulsed) i dss 60 1000 a v ds = 10 v, v gs = ? v dynamic electrical characteristics common source forward transconductance g fs 100 1500 s v ds = 10 v, v gs = ? v f = 1 khz common source output conductance g os 3sv ds = 10 v, i d = 30 a f = 1 khz common source input capacitance c iss 3pfv ds = 10 v, v gs = ? v f = 1 mhz common source reverse transfer capacitance c rss 1.5 pf v ds = 10 v, v gs = ? v f = 1 mhz equivalent circuit input noise voltage e n 20 70 nv/ hz v ds = 10 v, i d = 30 a f = 10 hz noise figure nf 1 db v ds = 10 v, i d = 30 a f = 10 hz r g = 10 m max - ifn421 IFN422 ifn423 differential gate source voltage |v gs1 C v gs2 | 10 15 25 mv v dg = 10 v, i d = 30 a differential gate source voltage |v gs1 C v gs2 | t a = C 55c 10 25 40 v/c v dg = 10 v, i d = 30 a t b = 25c with temperature ? t t c = 125c min - ifn421 IFN422 ifn423 common mode rejection ratio cmrr 90 80 80 db v dg = 10 v to 20 v, i d = 30 a very high input impedance differential amplifiers electrometers 1000 n. shiloh road, garland, tx 75042 (972) 487-1287 fax (972) 276-3375 www.interfet.com databook.fxp 1/14/99 12:22 pm page b-41
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