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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In the datasheett below a input voltage of 12V is regulated to 5V using the 78L See Fig 5 on the datasheet. Especially if you read up on using sleep mode.

National Semiconductor

Voltage regulators are very common in electronic circuits. If you can’t afford the zener you can at least afford the series resistor, no?

The 33V TVS isn’t good enough.

My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. Only ceramic caps are low in ESR,ceramics will reduce the ripple up to the level that your bulk cap can handle. I’ve checked pins on datasheet and they are the same on the sketch, but what is the right way of the piece? A capacitor across the zener further increases this effect. Resistors in series drop the 24 V to 5V. If TI says a nF is required at the input, for pete’s sake, put it there!


Kaz datashfet 1 23 In our case the 78L05 IC is an iconic regulator IC that finds its application in most of the projects. 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. Alternative Regulator for 78L In practice Vzener will rise very slightly.

Many of these are are specially designed for an automotive environment check spec sheet in each case and will survive in places where an LM will be destroyed or will protect your 5V powered circuit in situations where an LM would allow it to be destroyed.

LM data sheet here. Can you suggest any sources like this?

National Semiconductor – datasheet pdf

Simple shunt regulator with zener diode preregulator to greatly reduce spikes: In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps? Then you don’t need the voltage regulator and they will datashwet longer.

Formal verification of safety-critical software, software development, and electronic design and prototyping. TL dissipates unwanted current. 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.


Also note the Capacitors C1 and C2 are used at both the Input and output end. Or I only need a bypass capacitor? So the capacitor is useful even if the DC coming in over those long wires is as flat as a pancake. Yaro Full Member Posts: How to use 78L I saw only those values in the datasheet, not higher. My load datqsheet just an 8-bit microcontroller and a transistor’s base with 1K in series. Add a say 10 uF and 0.

LM78L05 Datasheet(PDF) – National Semiconductor (TI)

A zener at the resistor midpoint clamps this to say 12V or some convenient value and greatly reduces transients. 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 Email Required, but never shown.

So, the SD Card apparently has more stringent requirements for driving. Russell suggests using a series resistor, and I concur. The datasheet says for ‘LM’ it’s 35vso your on the margin. Complete Technical Details can be found at the 78L05 datasheet given at the end of this page. Please post technical questions on the forum, not by personal message.