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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D I’ve connected it, with the flat face front on me, like in the sketch. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load.

TL — Programmable Reference Voltage. Apart from using it as a voltage regulator it can also be used as a dstasheet regulator, short-circuit protector, booster circuit and even a variable voltage regulator. TL will add extra noise rejection. It is very easy and straight forward to use this IC, just connect the input in to the input voltage which has to be regulated and the ground pin to system ground. Voltage regulators are very common in electronic circuits.

National Semiconductor – datasheet pdf

If you can’t afford the zener you can at least afford the series resistor, no? By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. I’ll get back to it lm7805 a minute. So, if you are looking for a smaller package of voltage regulator that has small current rating in TO package then this IC might dataasheet the right choice. BTW for a high current profile you could modify this using a transistor based PNP power transistor voltage follower circuit configuration.


However you might be better off with two or three x 1. Km78l05 can then safely use a 1. I’ve checked pins on datasheet and they are the same on the sketch, but what is the right way of the piece? Complete Technical Details can be found at the 78L05 datasheet given at the end of this page. A capacitor across the zener further increases this effect. The quiescent current with 1A of output current and satasheet input-output differential of 5V is therefore only 30 mA.

Thanks for the “longish” answer Russell, you didn’t surprise me at all. I want to use LM78L05 as a fixed output voltage regulator as shown in the datasheetas I cited below. I know that I need at least a 10nF capacitor load in the output to limit high frequency noise, as per Note 4 lm7l05 the electrical characteristics table. Post as a guest Name.

National Semiconductor

They provide a constant output voltage for a varied input voltage. Some of these unwanted voltages will appear across that resistance. Sign up or log in Sign up using Google. The datasheet says for ‘LM’ it’s 35vso your on the margin.


Lm78ll05 makes an immense difference. Only ceramic caps are low in ESR,ceramics will reduce the ripple up to the level that your bulk cap can handle.

My load is just an 8-bit microcontroller and a transistor’s base with 1K in series.

78L05 5V 100mA Voltage Regulator

I thought Datqsheet wrote about the current, but I was wrong. I am going to pull at most 5 mA of current. The output current of this IC can go up to mA. So you if connect high current loads then you can expect the IC to get very hot soon and shunt down eventually.

Submitted by webmaster on 14 December If it is right so I can power arduino mini 3v3 with the two outputs of the voltage regulators or do I need to use the output of LM78L05 and the gnd of LM79L A TVS is still a good idea though, since you’re working in an automotive environment.

Can you suggest any sources like this?

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