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 seems to me like a LM with those R1 and R2 added inside. Like Russell says, you can protect the output against overvoltage by placing a power diode between output and input, cathode to the input.

SOT23*LM National Semiconductor => TI

Then I am confused about voltages. The circuit is wrong. It is said to be a regulated power supply with variable DC output V, mA.

There is a related line of 79xx devices which are complementary negative voltage regulators. January Learn how and when to remove this template message.


My second question goes here: That’s right, the standard linear regulator since many moons. Reports of the death of the may be premature: I expect there actually is some resistor insidesemicondictor R1 is not required to let it work.


I think you answered part of your own question: Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1. Encyclopedia of Electronic Components Volume 1: I am asking because it doesn’t correspond to the the datasheet:.

Home Questions Tags Users Unanswered. The LM78S40 from Fairchild is not part of the 78xx family and does not use the same design.

SOT23*LM National Semiconductor => TI

Use an LM if possible – datasheet here. But we don’t know its value so we are unable to say what will be the exact output voltage when using seimconductor design on the first image. Sign up or log in Sign up using Google. You’ll be able to regulate from 1.

Some devices provide slightly different voltages than usual, such as the LM78L62 6. So we’ve got only 8. What I miss there is R1. For the years, see 8th millennium. 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.


By using this site, you agree to the Terms of Use and Privacy Policy. It is a component in switching regulator designs and is not a linear regulator like other 78xx devices.

In other projects Wikimedia Commons. These devices support an input voltage anywhere from around 2. The SR from Datel is a full switching power supply module designed as a drop-in replacement for 78xx chipsand not mational linear regulator like the 78xx ICs.

This means your regulator won’t go higher than There are some problems with the design. Sign up using Email and Password. The variable resistor to regulate the output voltage.