The LM78LXX series of three terminal positive regulators is available with several fixed output voltages making them useful in a wide range of applications . LM78L05 ELECTRICAL CHARACTERISTICS. (VI = 10V, IO = 40mA, 0°C ≤ TJ ≤ °C, CI = µF, CO = µF, unless otherwise specified. (Note 1). Part Number: LM78L05, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor.

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National Semiconductor

So ditch the 79L05 and connect pin 4 of the INA to ground instead. So the capacitor is useful even if the DC coming in over those long wires is as flat as a pancake.

Bypass caps are often put individually across the power supply legs of individual integrated circuits or other components to try to trap these stray signals. Please do not ask for unpaid help via PM, use lm78l005 forum. A single LM should do the trick. My regulator is 2 meters away from the power supply filter.

The INA will work down to 2. These “bypass capacitors”, as a rule of thumb, have to be located close to the devices being lm788l05.

So, if you are looking for a smaller package of voltage regulator that has small current rating in TO package then this IC might be the right choice. But I’m not sure I can find a See Fig 5 on the datasheet. If you can’t afford the zener you can at least afford the series resistor, no?


Yaro Full Member Posts: My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. The datasheet says for ‘LM’ it’s 35vso your on the margin. How to use 78L You shouldn’t worry about the 25mW, this would otherwise be dissipated in the l,78l05 For instance the Littelfuse 1.

In our case the 78L05 IC is an iconic regulator IC that finds its application in most of the projects. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Russell dataseet using a series resistor, and I concur.

But when I measure the voltage between the two outputs O I note 10v, datasueet right? Also note the Capacitors C1 and C2 are used at both the Input and output end. Submitted by webmaster on 14 December In that using a high current regulator like would be an ideal choice.

The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. This is a 5V. Simple shunt regulator with zener diode preregulator to greatly reduce spikes: My load is just an 8-bit microcontroller and a transistor’s base with 1K in series. About 25 Hz corner frequency. Some of these unwanted voltages will appear across that resistance. However you might be better off with two or three x 1.


The regulated 5V can be obtained from the output pin if the IC. The reason for this “required if more than xxx distance” requirement is that one of the things that the capacitor does is act as a short circuit for alternating current signals that appear on the power rails and are unwanted.

Apart from using it as a voltage regulator it can also be used as a current regulator, short-circuit protector, booster circuit and even a variable voltage regulator.

78L05 5V mA Voltage Regulator | DA78L05 |

I do not understand how the series resistor xatasheet drop the voltage? I know that I need at least a 10nF capacitor load in the output to limit high frequency noise, as per Note 4 in the electrical characteristics table.

You may also see several different capacitances used, because llm78l05 caps are good for going down to the low frequencies, but become inductive at high frequencies. Btw I have found this on how to use a TVS. In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps?

Voltage Regulator 78L05

But I have doubts. I am going to pull at most 5 mA of current. Another popular voltage regulator is which is bulkier in size but has high current rating of about 1A.

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