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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So, the SD Card apparently has more stringent requirements for driving. Simple shunt regulator with zener diode preregulator to greatly reduce spikes: You don’t need -5V for the mini. The three terminals are Input, Output and ground as shown in the 78L05 pinout diagram.

Add a say 10 uF and 0. I thought I wrote about the current, but I was wrong.

The regulated 5V datasheeh be obtained from the output pin if the IC. Rated reverse standoff voltage is always lower than breakdown voltage. I would even go a step further, and also place a zener diode on the input, so that you get a shunt pre-regulator.

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LM78L05 from Texas Instruments

In practice Vzener will rise very slightly. This makes an immense difference. Familiar regulator features such as short circuit and thermal overload protection are also provided.


Submitted by webmaster on 14 December A single LM should do the trick. If there is a capacitor there, but is far away, it dahasheet that there is a resistance in series with that capacitor. But I have doubts.

LM78L05 Datasheet

Dtasheet I do, will I encounter any problems? Also note the Capacitors C1 and C2 are used at both the Input and output end.

See Fig 5 on the datasheet. Program TL to 5V with say 2 x 10k resistors.

Another popular voltage regulator is which is bulkier in size but has high current rating of about 1A. How to use 78L Sign up using Facebook. TL will add extra noise rejection. The LM78L05’s absolute maximum input voltage is only datashest. It is very llm78l05 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.

I’ll get back to it in a minute. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. In the circuit below a input voltage of 12V is regulated to 5V using the 78L I’ve checked pins on datasheet and they are the same on the sketch, but what is the right way of the piece?


Datzsheet “bypass capacitors”, l78l05 a rule of thumb, have to be located close to the devices being powered. You can then safely use a 1. You don’t need the -5V supply at all. How much current does the load draw? 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. That’s where the smaller capacitors take over and provide bypass.

So the capacitor is useful even if the DC coming in over those long wires is as flat as a pancake. Ah, great ideas, but this is a cost sensitive application.

I am going to pull at most 5 mA of current. I do not understand how the series resistor will drop the voltage? Russell suggests using a series resistor, and I concur. The resistor will drop the input voltage and form a low-pass filter with the LM78L05’s input capacitor.