LM–XX. Input. Cin*. µF. CO**. Output. 1. MOTOROLA ANALOG IC DEVICE DATA. Three-Terminal Positive. Fixed Voltage Regulators. This family of fixed. the LM is available in the SOT package, as well .. †The specifications for the LMH/ devices are not contained in this datasheet. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.

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The input capacitor is a typical reservoir capacitor, its value is relatively non critical. Depending on feedback parameters you might get low frequency oscillation, slow enough to see as variations on a “DC” meter and you might get more like MHz signals.

LM340 Datasheet PDF

Tantalum is an OK choice but is not the best choice. The input voltage must remain typically 1. Output 1 2 3 Heatsink surface is connected to Pin 2. It depends on what you are powering but it’s not usually all that critical unless ripple and transient response are especially critical for you.

The input capacitor is not overly critical when the regulator is fed from an already well decoupled system bus. XX these two digits of the type number indicate voltage.

LM Datasheet catalog

Required ESR is stated as. With the price of tantalum these days I would recommend using one of your electrolytics with a small ceramic capacitor in parallel – say nF.


Higher capacitances are also stable. I wasn’t criticising you – sorry if it seemed datashdet way.

Absolute maximum ratings note 1 if militaryaerospace specified devices are required, please contact the national semiconductor sales office distributors for availability and specifications. 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.

MattYoung And how long do you think that edit would last? Although no output capacitor is needed for stability, it does help transient response. Although designed primarily as a fixed voltage regulator, these devices.

The lmh and lmk may also be procured as jan devices on slash sheet jm Lm datasheet, lm pdf, pinouts, circuit texas. I’ve read this so many times – “maintain regular stability”.

Regulator instability, in my experience, and as you’d expect results in the regulator oscillating, with large level and often high frequency signal at the output and a DC voltage measured with a non-RMS meter that appears to be stable DC at an incorrect value.

If the net loop feedback is positive you get oscillation. Matt, having read a little more about it, ESR certainly seems likely to be the reason. Any increase of the output capacitance will merely improve the daatasheet stability and transient response. A naive passerby like myself would expect lower series resistance to be better. Wikipedia isn’t the free-for-all you seem to think it is. Jon Bright 2 3 9. The 10 uF, 10V is about half the allowed ESr – perhaps a bit close for comfort across lifetime.


If needed, use a 0. I’m still a little puzzled about why they specifically call out tantalum so much, but your answer makes clear that I can overlook this. If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. Email Required, but never shown. Ordering information heatsink surface connected to om340 2. Only slightly more complex – good Sueful – stack exchange Useful Lots of related pictures And one final note, did you refer to the ripple voltage on the cap being large even for small currents darasheet an inherent issue due to the small size?

Required ESR is stated as 0.

The output capacitor is “safe” against spikes in most cases. The following is what you may see in typical circumstances – actual results vary widely but this is a guide. I’d be pleased to hear anyone critique my reply on technical grounds. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. But, I don’t believe so.

The LM datasheet provides clear guidance on the essential and desirable characteristics of the input and output capacitors. Average Temperature Coefficient of Output Voltage. Devices are available with improved specifications, including. The output capacitor is critical in maintaining regulator stability, datasheer must meet the required conditions for both minimum amount of capacitance and ESR Equivalent Series Resistance.