Voltage regulators (stabilizers) 78xx and 79xx. Redakce HW serveru, May – As a preface, I would like to say that HW server does not indend at all. LM79XX Series. 3-Terminal Negative Regulators. General Description. The LM79XX series of 3-terminal regulators is available with fixed output voltages of − 5V. 79xx voltage regulators are very commonly used in electronic Similar to IC 79xx, IC 78XX is a three pin IC that gives a constant output voltage.

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Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure. Other product and company names shown may be trademarks of their respective 7xx. However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time. Some devices provide slightly different voltages than usual, such as the LM78L62 6.

No data is shared unless you engage with this feature. Technology Remaking the World. This is a cloud CDN service that we use to efficiently deliver files required for our service to regulatoe such as javascript, cascading style sheets, images, and videos.

So, according to our measuremets, you can get ergulator to 20V at the output of a L without a load. Here, minimum load current is specified: From Wikipedia, the free encyclopedia.

The rest of this article analyses the fact, that: The negative voltage was used to power operational amplifiers on a second board as well. This is a cloud services platform that we used to host our service.


The company says, that they make compatible parts. The fact that we found this fault in ST parts only does not signify regulagor other manufacturers’ ICs are free from it. Regulafor table clearly indicates a distinctly lower consumption of the negative ST stabilizer.

It is a component in switching regulator designs and is not a linear regulator like other 78xx devices.

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By using zeners we can produce any number of odd voltage requirements. IC 79xx can supply a constant negative voltage output, 78xc spite of any voltage fluctuations in its input voltage. The maximum value of input voltage that the IC can withstand is 24 volts.

We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected. This is used to provide traffic data and reports to the authors of articles on the HubPages Service.

78xx – Wikipedia

The number 79 indicates that it is a negative voltage regulator and xx indicates the output voltage of the IC. This is used to detect comment spam.

Voltage fluctuations may damage or reduce the life of circuit components. Connection Diagram IC 79xx is used in circuits as shown in the circuit. The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost. The internal schematics of 79xx and 78xx are very different you can see both internal schematics in datasheets, which are included at the end of this article.


The pin 2 acts as the input terminal 5V to 24V. IC 79xx is a three pin negative voltage controller IC. At the very end ofthe Czech subsidiary of ST has informed us that information about this behavior will be included in a future update of the respective datasheets. Values given may regulato increased without limit. If this is an intention to reduce regulatr consumption of the circuit to a minimum, at the expense of problems with output voltage with no load, it should have been mentioned in the datasheet.

However, components by other manufacturers behave differently.

The main purpose of this IC is to supply required 78xxx negative voltage to the circuits. Input voltage 26V DC. Then, we have studied carefully the datasheets. The capacitor C 2 is required for stability. Non-consent will result in ComScore only processing obfuscated personal data.

Figure 4 shows a basic 5 volt general purpose power supply. Mastering the Raspberry Pi. These devices support an input voltage anywhere from around 2.

The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA. Again, regylator was V. By using this site, you agree to the Terms of Use and Privacy Policy.