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- - **PSpice Models for 2955/3055**
(*http://www.diyaudio.com/forums/solid-state/5493-pspice-models-2955-3055-a.html*)

PSpice Models for 2955/3055Hello,
I searched the net as well as this forum for pspice models of the 2955/3055 with no luck. I was wondering if anyone could point me in the right direction. Thanks in advance, Jamey |

I think this is going to be tough, at least to get one whose results can be trusted, because these devices are so old and so many manufacturers make parts with these labels. I don' t think that parameters are very well controlled for them, so if you get a spice model for a device made on a fast process that happens to be labelled 3055 it may not be at all representative of reality for an older or slower process.
I think Bob Pease had something to say about the wide variation in old numbered power transistors, how a circuit that always worked perfectly with the slow ones from mfr X would always oscillate with a fast one from mfr Y or vice versa, even though the devices had the same @Nxxxx number. You MIGHT be able to get away with using models for MJ802 and MJ4502 if you can find those. (Sorry, I don't have 'em) |

Pspice modelsHere's one:
*2N3055 *Si 115W 70V 15A 20kHz pkg:TO-3 3,2,1 .MODEL 2N3055 NPN(IS=4.66E-12 BF=360 VAF=100 IKF=0.25 ISE=3.339E-11 + BR=2 ISC=5E-9 RB=3 IRB=0.001 RBM=0.4 RC=0.04 CJE=5.802E-10 VJE=1.2 + MJE=0.45 TF=8E-8 XTF=1 ITF=3 PTF=120 CJC=2.121E-10 MJC=0.4 TR=2.55E-6 + XTB=1 ) Looking for the other one... Jan Didden |

And here's the other, MJE2955
*.model MJE2955 ako:NSC_5A PNP() ; case Mot 90 (s) .MODEL MJE2955 PNP(Is=66.19f Xti=3 Eg=1.11 Vaf=100 Bf=137.6 Ise=862.2f + Ne=1.481 Ikf=1.642 Nk=.5695 Xtb=2 Br=5.88 Isc=273.5f Nc=1.24 + Ikr=3.555 Rc=79.39m Cjc=870.4p Mjc=.6481 Vjc=.75 Fc=.5 + Cje=390.1p Mje=.4343 Vje=.75 Tr=235.4n Tf=23.21n Itf=71.33 + Xtf=5.982 Vtf=10 Rb=.1) Or as TIP2955, in a TO220 case: *.model TIP2955 ako:NSC_5A PNP() ; case TO-220 (s) .MODEL TIP2955 PNP(Is=66.19f Xti=3 Eg=1.11 Vaf=100 Bf=137.6 Ise=862.2f + Ne=1.481 Ikf=1.642 Nk=.5695 Xtb=2 Br=5.88 Isc=273.5f Nc=1.24 + Ikr=3.555 Rc=79.39m Cjc=870.4p Mjc=.6481 Vjc=.75 Fc=.5 + Cje=390.1p Mje=.4343 Vje=.75 Tr=235.4n Tf=23.21n Itf=71.33 + Xtf=5.982 Vtf=10 Rb=.1) This is the best I can do for now. |

Pspice models etcHoffmeyer,
Maybe you should also post the MJE3055 and TIP3055 if you have that, so we have a consistent set of model pairs. Jan Didden |

That's a good idea, Jan.
*.model MJE3055 ako:NSC_4A NPN() ; case Mot 90 (s) .MODEL MJE3055 NPN(Is=457.5f Xti=3 Eg=1.11 Vaf=50 Bf=156.7 Ise=1.346p Ne=1.34 + Ikf=3.296 Nk=.5961 Xtb=2.2 Br=7.639 Isc=604.1f Nc=2.168 + Ikr=8.131m Rc=91.29m Cjc=278.7p Mjc=.385 Vjc=.75 Fc=.5 Cje=433p + Mje=.5 Vje=.75 Tr=1.412u Tf=37.34n Itf=35.68 Xtf=1.163 Vtf=10 + Rb=.1) ------------------------------ *.model TIP3055 ako:NSC_4A NPN() ; case TO-220 (s) .MODEL TIP3055 NPN(Is=457.5f Xti=3 Eg=1.11 Vaf=50 Bf=156.7 Ise=1.346p Ne=1.34 + Ikf=3.296 Nk=.5961 Xtb=2.2 Br=7.639 Isc=604.1f Nc=2.168 + Ikr=8.131m Rc=91.29m Cjc=278.7p Mjc=.385 Vjc=.75 Fc=.5 Cje=433p + Mje=.5 Vje=.75 Tr=1.412u Tf=37.34n Itf=35.68 Xtf=1.163 Vtf=10 + Rb=.1) |

Pspice modelsMany thanks!
Jan Didden |

Just checked an old Motorola databook from 1989, and there Motorola recommend that the one in the "mot 90" case is not to be used in new designs, meaning that it'll probably be discontinued by now.
Use the TIP2955/3055 spice models. |

dumb questionThe MJE & TIP models appear identical, so they don't account for possibly different package parasitics.
But that's not the question. Actually two questions. Are MJE/TIP3055 and MJE/TIP2955 supposed to be replacements for the TO-3 case 2N3055 / MJ2955 ? I don't think you can trust that Moto's numbering is meaningful here. For example, I think MJE802 is a darlington while MJ802 is (was?) a single big NPN. Also, note that the parameters wrt beta (BF, BR) and Ft (TF) are WAY different for the 2N3055 model and the MJE3055 model ... caveat simulator (good advice in all circumstances) |

Thanks to everyone who replied. You have been a great help.
I have been reading this forum for a few weeks now and am very impressed with how helpful everyone is. Thanks Again, Jamey |

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