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pinouts for L120AB ic

Discussion in 'Electronic Components' started by Michael Phillips, Jun 1, 2007.

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  1. Hi,
    I let the smoke out of an IC on an induction motor speed control board.
    The IC is discontinued and is an SGS manufacture. Its a zero crossing triac
    driver. I am unable to find the pinouts or a schematic for it despite
    having googled all over the place. Can anyone help with this? If you email
    me please remove one of the three 'l's in the email address.
  2. Guest

    I googled in the UK and found this one for £29...
    Hope it helps
  3. wrote in
    Thanks Pete. 29quid is a bit steep for an ic that cost about 2 quid when
    in common use. Alternatives do exist such as the OM5428 at I believe
    modest cost but from examination of the damaged pc board pinouts seem to be
    different. I'd like to modify the board for an om5428 (or another similar
    ic) but I cannot fathom all the pinouts from examination of the board -
    hence the desire for a schematic or datasheet for the L120AB. But thanks
  4. Prepair Ltd

    Prepair Ltd Guest

    We used to use them, 'might' have one or two around, I'll have to look.

    Pin 1 is Input
    Pin 2 is Current ref
    Pin 3 is 0V
    Pin 4 is Volt Ref
    Pin 5 is Output

    We have the SGS-Thomson 1992 App's guide with the circuits etc.

  5. Prepair Ltd

    Prepair Ltd Guest

    Ignore that, wrong IC!!

    Still checking...

  6. Prepair Ltd

    Prepair Ltd Guest

    What is different to the basic L120 ?

    Have got that data sheet, 16-pin scr/triac driver/controller?

  7. There may well be no difference - at least in pinouts. it sounds a very
    similar device - 16 pin triac driver/controller with zero crossing
    triggering capability. Possibly slightly different voltage/current ratings
    etc? If you have a data sheet for the L120 I'd be glad to have a look at
    that. The only pin I'm reasonably certain of is the trigger output, pin 7
    on the l120ab.
  8. Prepair Ltd

    Prepair Ltd Guest

    Pin 1 Ramp Voltage
    Pin 2 Amplifier Output
    Pin 3 Non-Inv Amplifier Output
    Pin 4 DC ref Voltage
    Pin 5 Inv Amplifier Input
    Pin 6 Stabilised DC Supply
    Pin 7 Gate Pulse Output
    Pin 8 Positive Rectifier Supply
    Pin 9 AC Supply
    Pin 10 Negative Rectifier Supply
    Pin 11 Chopper
    Pin 12 Ground
    Pin 13 Ground
    Pin 14 NC
    Pin 15 Output Logic Circuit
    Pin 16 Current Generator

    These are the pin descriptions from the data sheet.

    Let me have your email address (mine is a valid reply-to) and I'll send you the
    pdf file.

  9. GRIG


    Dec 4, 2009
    i'm searching for l120ab datasheet to use another ic pin to pin compatible.
    Can you help me?
  10. tuandaubac


    Apr 12, 2010
    My name is Tuan.
    I have a final year project about scr controller. I use Ic L120AB.
    I'm searching for l120ab datasheet.
    Please help me! Thank you!
  11. tuandaubac


    Apr 12, 2010
    My email:
  12. tuandaubac


    Apr 12, 2010
    My email: " "
  13. tuandaubac


    Apr 12, 2010
    my yahoo nick: satthubongdemlove
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