need some help finding LTspice components.

Discussion in 'Electronics Resources' started by Sonoma_Dog, Sep 11, 2008.

  1. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
    99
    0
    Finally i got my hand started on LTspice. looks pretty easy to use and works great so far. But LTspice only comes with basic components like resistor, cap, and LT parts. so i want to know where can i get more parts?

    I also joined the LT yahoo group, but cant find any components that i need. I tried to search for LM741 op-amp, but got no luck after looking at the files for an hour. I am just wondering if there is an easier way to search for the components?

    Thanks in advance
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Why would you want to model an LM741, when virtually anything in Linear Technology's lineup is far and away better?

    This is sort of like going to an exotic sports car lot that's loaded with Ferraris, Jaguars, Mercedes and Porches, and wondering why they don't have a '64 VW Beetle with bald tires, busted headlights, broken-down upholstery and leaking oil like the Exxon Valdez.

    At least look for something halfway decent, like a TL071, TL072, LF351, LF353. No, they're not in Linear's libraries either - but I'll bet you'll find those on the LT Yahoo Group files.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If you really want one, here's Texas Instrument's version; a UA741.
    Code ( (Unknown Language)):
    1. * UA741 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT
    2. * CREATED USING PARTS RELEASE 4.01 ON 07/05/89 AT 09:09
    3. * (REV N/A)      SUPPLY VOLTAGE: +/-15V
    4. * CONNECTIONS:   NON-INVERTING INPUT
    5. *                | INVERTING INPUT
    6. *                | | POSITIVE POWER SUPPLY
    7. *                | | | NEGATIVE POWER SUPPLY
    8. *                | | | | OUTPUT
    9. *                | | | | |
    10. .SUBCKT UA741    1 2 3 4 5
    11. *
    12.   C1   11 12 4.664E-12
    13.   C2    6  7 20.00E-12
    14.   DC    5 53 DX
    15.   DE   54  5 DX
    16.   DLP  90 91 DX
    17.   DLN  92 90 DX
    18.   DP    4  3 DX
    19.   EGND 99  0 POLY(2) (3,0) (4,0) 0 .5 .5
    20.   FB    7 99 POLY(5) VB VC VE VLP VLN 0 10.61E6 -10E6 10E6 10E6 -10E6
    21.   GA 6  0 11 12 137.7E-6
    22.   GCM 0  6 10 99 2.574E-9
    23.   IEE  10  4 DC 10.16E-6
    24.   HLIM 90  0 VLIM 1K
    25.   Q1   11  2 13 QX
    26.   Q2   12  1 14 QX
    27.   R2    6  9 100.0E3
    28.   RC1   3 11 7.957E3
    29.   RC2   3 12 7.957E3
    30.   RE1  13 10 2.740E3
    31.   RE2  14 10 2.740E3
    32.   REE  10 99 19.69E6
    33.   RO1   8  5 150
    34.   RO2   7 99 150
    35.   RP    3  4 18.11E3
    36.   VB    9  0 DC 0
    37.   VC 3 53 DC 2.600
    38.   VE   54  4 DC 2.600
    39.   VLIM  7  8 DC 0
    40.   VLP  91  0 DC 25
    41.   VLN   0 92 DC 25
    42. .MODEL DX D(IS=800.0E-18)
    43. .MODEL QX NPN(IS=800.0E-18 BF=62.50)
    44. .ENDS
    45.  
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Here's TI's model for an LF353:
    Code ( (Unknown Language)):
    1. * LF353 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT
    2. * CREATED USING PARTS RELEASE 4.01 ON 06/27/89 AT 08:19
    3. * (REV N/A)      SUPPLY VOLTAGE: +/-15V
    4. * CONNECTIONS:   NON-INVERTING INPUT
    5. *                | INVERTING INPUT
    6. *                | | POSITIVE POWER SUPPLY
    7. *                | | | NEGATIVE POWER SUPPLY
    8. *                | | | | OUTPUT
    9. *                | | | | |
    10. .SUBCKT LF353    1 2 3 4 5
    11. *
    12.   C1   11 12 3.498E-12
    13.   C2    6  7 15.00E-12
    14.   DC    5 53 DX
    15.   DE   54  5 DX
    16.   DLP  90 91 DX
    17.   DLN  92 90 DX
    18.   DP    4  3 DX
    19.   EGND 99  0 POLY(2) (3,0) (4,0) 0 .5 .5
    20.   FB    7 99 POLY(5) VB VC VE VLP VLN 0 28.29E6 -30E6 30E6 30E6 -30E6
    21.   GA    6  0 11 12 282.8E-6
    22.   GCM   0  6 10 99 1.590E-9
    23.   ISS   3 10 DC 195.0E-6
    24.   HLIM 90  0 VLIM 1K
    25.   J1   11  2 10 JX
    26.   J2   12  1 10 JX
    27.   R2    6  9 100.0E3
    28.   RD1   4 11 3.536E3
    29.   RD2   4 12 3.536E3
    30.   RO1   8  5 50
    31.   RO2 7 99 11.62
    32.   RP    3  4 15.00E3
    33.   RSS  10 99 1.026E6
    34.   VB    9  0 DC 0
    35.   VC    3 53 DC 2.200
    36.   VE   54  4 DC 2.200
    37.   VLIM  7  8 DC 0
    38.   VLP  91  0 DC 30
    39.   VLN   0 92 DC 30
    40. .MODEL DX D(IS=800.0E-18)
    41. .MODEL JX PJF(IS=12.50E-12 BETA=250.1E-6 VTO=-1)
    42. .ENDS
    43.  
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Here's TI's TL071:
    Code ( (Unknown Language)):
    1.  
    2. * TL071 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT
    3. * CREATED USING PARTS RELEASE 4.01 ON 06/16/89 AT 13:08
    4. * (REV N/A)      SUPPLY VOLTAGE: +/-15V
    5. * CONNECTIONS:   NON-INVERTING INPUT
    6. *                | INVERTING INPUT
    7. *                | | POSITIVE POWER SUPPLY
    8. *                | | | NEGATIVE POWER SUPPLY
    9. *                | | | | OUTPUT
    10. *                | | | | |
    11. .SUBCKT TL071    1 2 3 4 5
    12. *
    13.   C1   11 12 3.498E-12
    14.   C2    6  7 15.00E-12
    15.   DC    5 53 DX
    16.   DE   54  5 DX
    17.   DLP  90 91 DX
    18.   DLN  92 90 DX
    19.   DP    4  3 DX
    20.   EGND 99  0 POLY(2) (3,0) (4,0) 0 .5 .5
    21.   FB    7 99 POLY(5) VB VC VE VLP VLN 0 4.715E6 -5E6 5E6 5E6 -5E6
    22.   GA    6  0 11 12 282.8E-6
    23.   GCM   0  6 10 99 8.942E-9
    24.   ISS   3 10 DC 195.0E-6
    25.   HLIM 90  0 VLIM 1K
    26.   J1   11  2 10 JX
    27.   J2   12  1 10 JX
    28.   R2    6  9 100.0E3
    29.   RD1   4 11 3.536E3
    30.   RD2   4 12 3.536E3
    31.   RO1   8  5 150
    32.   RO2   7 99 150
    33.   RP    3  4 2.143E3
    34.   RSS  10 99 1.026E6
    35.   VB    9  0 DC 0
    36.   VC    3 53 DC 2.200
    37.   VE   54  4 DC 2.200
    38.   VLIM  7  8 DC 0
    39.   VLP  91  0 DC 25
    40.   VLN   0 92 DC 25
    41. .MODEL DX D(IS=800.0E-18)
    42. .MODEL JX PJF(IS=15.00E-12 BETA=270.1E-6 VTO=-1)
    43. .ENDS
    44.  
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    TI's TL072:
    Code ( (Unknown Language)):
    1. * TL072 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT
    2. * CREATED USING PARTS RELEASE 4.01 ON 06/16/89 AT 13:08
    3. * (REV N/A)      SUPPLY VOLTAGE: +/-15V
    4. * CONNECTIONS:   NON-INVERTING INPUT
    5. *                | INVERTING INPUT
    6. *                | | POSITIVE POWER SUPPLY
    7. *                | | | NEGATIVE POWER SUPPLY
    8. *                | | | | OUTPUT
    9. *                | | | | |
    10. .SUBCKT TL072    1 2 3 4 5
    11. *
    12.   C1   11 12 3.498E-12
    13.   C2    6  7 15.00E-12
    14.   DC    5 53 DX
    15.   DE   54  5 DX
    16.   DLP  90 91 DX
    17.   DLN  92 90 DX
    18.   DP    4  3 DX
    19.   EGND 99  0 POLY(2) (3,0) (4,0) 0 .5 .5
    20.   FB    7 99 POLY(5) VB VC VE VLP VLN 0 4.715E6 -5E6 5E6 5E6 -5E6
    21.   GA    6  0 11 12 282.8E-6
    22.   GCM   0  6 10 99 8.942E-9
    23.   ISS   3 10 DC 195.0E-6
    24.   HLIM 90  0 VLIM 1K
    25.   J1   11  2 10 JX
    26.   J2   12  1 10 JX
    27.   R2    6  9 100.0E3
    28.   RD1   4 11 3.536E3
    29.   RD2   4 12 3.536E3
    30.   RO1   8  5 150
    31.   RO2   7 99 150
    32.   RP    3  4 2.143E3
    33.   RSS  10 99 1.026E6
    34.   VB    9  0 DC 0
    35.   VC    3 53 DC 2.200
    36.   VE   54  4 DC 2.200
    37.   VLIM  7  8 DC 0
    38.   VLP  91  0 DC 25
    39.   VLN   0 92 DC 25
    40. .MODEL DX D(IS=800.0E-18)
    41. .MODEL JX PJF(IS=15.00E-12 BETA=270.1E-6 VTO=-1)
    42. .ENDS
    43.  
     
  7. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
    99
    0
    Sweet, so why LM471 is crap? and if i need to buy LT parts, do i just order from the LT website? or do they have any retail stores?


    Thanks
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The 741 was the greatest thing since sliced bread when it first came out. That was about 40 years ago. It has a number of shortcomings that were greatly improved upon in later designs - that were given different part numbers.

    Linear Technology components can be purchased directly from their website, from authorized distributors and direct sales offices.
    Digikey, Newark, and Arrow Electronics are three of the major distributors who have online websites where you can order items and have them shipped to you. I've used the first two of those distributors.

    There is a Purchasing link on Linear Technology's website. From there you can visit their online store, find out their authorized distributors and sales offices.

    It is a good idea to check a manufacturer's sales info to find out who their authorized distributors are, as counterfeit ICs have been showing up in great numbers the last few years. The counterfeits appear externally to be the same as the "real deal", but don't perform like them.
     
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