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It looks like the voltage regulator on my smoke unit is bad (click here for a related thread) and I need a LM78L05ACZ replacement.  Here is a mouser screen capture of the part number. It appears the technical specs on these are the same and the extra part numbers (like the /LFT4 designation in the first one) relates to packaging of the ordered quantity. Might be a dumb question but does anyone know what the additional pert number letters indicate?  Review of the data sheets has turned up a blank for me.  Thanks in advance for insights.

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Hokie,

Once again someone poses the eternal question, "What are you thinking?", as if you're crazy.

Pat, if it's that simple why didn't Lionel do it that way in the first place?

BTW -- From the tone, nature, and conclusions of your running commentary here on the forum I think I know what your answer will be and I'm probably in agreement with you.

Hokie, If you'd like to fix it "the right way" any of those listed will work largely because the mechanical packaging appears to be the same.  The extra letters frequently refer to:

  1. Package style, if there's more than one available.
  2. Rating, which could be commercial grade, automotive, or military.
  3. Temperature Range (Operating), which could be 0 to 85 degrees C, or -40 to 125 degrees C or similar.

In this case if we had a Texas Instruments data sheet, or a alternatively look up the LM78L05ACZ at TI's website, we could tell specifically.

Here's an example of one table pulled from the respective sheet highlighting some of the kinds of things I'm talking about:

Mike

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Last edited by Mellow Hudson Mike
@harmonyards posted:

Some of us don’t even bother with the crummy regulator, …..it can pretty easily be bypassed, …a 20-27 ohm resistor, a little voodoo wiring, and you’ll be back in business, for pennies…..

Pat

Pat, wrong regulator. hokie is asking about the 5v TO92 regulator on the smoke unit, not the AC regulator used on the semi dumb, not so smart units.

Can’t help Hokie. I use them interchangeably in this application.

Pete

Last edited by Norton
@hokie71 posted:

Thanks to all for the sage advice.  I feel much better about spending my $12 and I hope I have 4 spares to pass on to the next generation of smoke system repair experts, It seems I can't get myself to buy only one due to a bizarre concept known as the cost per unit.

You can get them at Amazon for less. If Jeff doesn’t have it you don’t need it.

Pete

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