KA A 1 Amp -5V Voltage Regulator. Part Number: KA Price: $ available for immediate number: KA Full datasheet: KA KA 3-Terminal 1A Negative Voltage Regulator. Features. Output Current in Excess of 1A Output Voltages of V Internal Thermal Overload Protection. KA ON Semiconductor / Fairchild Linear Voltage Regulators REGULATOR, – 5V, A, 4% datasheet, inventory & pricing.

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There is no such information in L79xx datasheets see picture way above. The rest of this article analyses the fact, that: We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected.

Again, there was V.

This is probably the cause of the problem. It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant. Tomas Kouba Jan Rehak Translated by: After a closer examination, I have found V kz7905 its reference input, instead of expected -8V. The comparison is only an example what a developer can buy in an electronics components store. Consumption no load Consumption 1k load LCV 2. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it.

The comparison in this article is not totally objective. We believe that the entire problem is caused by inadequate values of resistors between the input and the output. Possible cause of the problem: However, the fault does not occur for commonly used input voltages.


We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic. This is true, BUT:. At first, we came to a wrong conclusion, that the faulty stabilizers are sold at GM Electronic only, and we have released this information prematurely.

Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure.

KA datasheet, Pinout ,application circuits 3-Terminal 1A Negative Voltage Regulator

In most cases, only a single sample of a given type by a given manufacturer was available; exceptions are MC 3 samples measured and, of course, stabilizers by ST 5 samples of each type measured; samples purchased at different times in different stores. Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. So, keep this possibility in mind when designing your own applications. Since the stabilizers are used more often, several other parts are shown in the graph as well.

If this is an intention to reduce internal 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. Then, we have studied carefully the datasheets. Consumption no load Consumption 1k load LCV 1. Recommended operating circuit is shown.

Values shown were measured for a single sample; other samples as well as stabilizers by other manufacturers behaved similarly. Some time ago, I used a pair of and to generate symmetrical reference voltage in my circuit.


The whole thing worked about a year or so. The marginal current 4mA corresponds to a 2k load. Two stabilizers were used for comparison. Unfortunately, we could not get a sample to measure.

The 79xx voltage regulators series made by ST have vatasheet be connected to a load consuming at least 5 mA. The ST stabilizer is clearly distinct. May – 0: Stabilizers by ST differ, beginning from a certain voltage.

3-Terminal 1A Negative Voltage Regulator

Well, I bought a new L by ST. The internal schematics of 79xx and 78xx are very different you can see both internal schematics in datasheets, datasyeet are included at the end of this article. As I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it. As dxtasheet preface, I would like to say that HW server does not indend at all to ‘criticise at every cost’.

Values measured The comparison in this article is not totally objective. Again, we do apologize to GM Electronic for releasing this information. So, according to our measuremets, you can get up datsheet 20V at the output of a L without a load. However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time. PDF datasheet of a 79xx by National Semiconductors.