78L05 temperature stability

And there are more accurate / stable parts in the same package, such as the LP2950ACZ-5.0 types, 20ppm/C typ = 0.1mV/oC

Hah, the LP2950 *is* a bandgap reference (with a step-up amplifier)

That would be a puzzle, something I haven't noticed. The LM78L05 says its load regulation is typically 0.1% (1 to 40mA), whereas the LP2950 says its regulation is typically 0.04% (0.1 to 100mA). Of course, if you did mean 7805, rather than 78L05... The LP2950 has a nice low ground current of only 75uA (at low load currents).

With its 0.5% spec, and its low cost ($0.36 qty 1k at DigiKey), the LP2950A nicely straddles the line between voltage regulator and voltage reference... You can power a few modest-drain items and also use it as a tolerable voltage reference.

It is all in the datasheets. For the LM78XX, there is an "Average Output Voltage TempCo" of typical -0.65mV/°C

HTH Wolfgang

So is the 12-cent LM78L05, no?

It's a lot fussier about output capacitance than the 78xxx regulators (can be unstable with ceramic capacitors or too little capacitance). Maybe his was oscillating. At the price, I do like the tolerance of the A version for some applications.

Best regards, Spehro Pefhany

sorry,

should be LM78_L_XX

HTH Wolfgang

Hi Winfield,

W>>

Well, yes, of course, but the OP asked specifically for 78L05. If he needs an accurate voltage, the OP would be better off using a bandgap reference or something.

I have once used an LP2950-5.0 instead of a 7805. I was puzzled, how poor the load regulation was compared to a 7805.

regards, Wolfgang

Try reading the datasheet !

Graham