Order Number LMCT. LMCT or LMCT. See NS Package Number T03B. C National Semiconductor Corporation. RRD-B30M Printed in. Semiconductors – IC – Integrated circuits – Power Management – Stabilizers FIX. Image: Click to enlarge. SOT23*LM National Semiconductor => TI. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright , Texas Instruments Incorporated.

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The transformer’s output on the above picture is 12V, then 2 diodes take 0. This is the first I’ve seen of consolidation between TI and National part numbers, but you knew it had to come sooner or later.

But we don’t know its value so we are unable to say what will be the exact output voltage when using the design on the first image. To protect against the back polarity problem that you mentioned, connect a diode from output to input usually non conducting.

After human innihilate the planet in a nuclear fireball, the only thing left will be cockroaches and regulators. Reports of the death of the may be premature: This article needs additional citations for verification. OlinLathrop don’t forget s and s Sign up using Facebook. The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost. Is this design around correct?


Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits.

Also, LM has got a lower dropout voltage than and can give a higher current. Cool Projects for Open Source Hardware.

There is no need to connect the mains side of the transformer to circuit ground. Sign up or log in Sign up using Google. January Learn how and when to remove this template message. These devices support an input voltage anywhere from around 2.

78xx – Wikipedia

It is said to be a regulated power supply with variable DC output V, mA. Post as a guest Name. I think you answered part of your own question: My life will never be the same again: It is a component in switching regulator designs and is not a linear regulator like other nationao devices.

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Articles needing additional references semiconductlr January All articles needing additional references. What I miss there is R1. Semiconductod am asking because it doesn’t correspond to the the datasheet: How can this give 15 Volt output? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Russell McMahon k 9 Good news for China btw: The SR from Datel is a full switching power supply module designed as a drop-in replacement for 78xx chipsand not a linear regulator like the 78xx ICs.


Retrieved from ” https: I expect there actually is some resistor insideso R1 is not required to let it work.

So we’ve got only 8. The LM78S40 from Fairchild is not part of the 78xx family and does not use the same design.

The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components. I found this design on internet: Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1.

That’s right, the standard linear regulator since many moons.