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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Tantalum serves no technical purpose here. Sign up using Facebook. Would the output oscillate with high ripple or datashee undefined or what exactly would happen?


Spikes above rated value will produce a literally flaming melt down. This family of fixed voltage regulators are monolithic integrated circuits.

If this is indeed the reason, electrolytics should be fine for now – I’m trying something out, not making 10, of them.

The first group are capacitors that might be used in practice in this application at the low end of the capacitance range. I understand the need for the capacitors, but it’s not clear to me dxtasheet these should specifically be tantalum.

Because if someone like you finds something wrong you are able to correct it. The output capacitor is NOT a filter capacitor in any traditional sense.

Heatsink surface is connected to Pin 2. The output capacitor is “safe” against spikes in most cases.

Electolytics have poor high frequency performance compared to tantalums. Thank you for the extremely detailed and helpful answer.


Russell McMahon – Huh?

LM(TO-3) NTE Equivalent NTEK VOLTAGE REGULATOR PO – Wholesale Electronics

XX these two digits of the type number indicate. Using a tantalum capacitor as the input capacitor invites capacitor death at any time if the input power rail can have voltage spikes on it from any source. Its principal role is to provide loop stability for the regulator. The ESR of the output capacitor will cause loop instability if it is too high or too low. Average Temperature Coefficient of Output Voltage.

Smoke, flame, noise, bad smell and explosion all optional – I have seen one tantalum cap do all of these in turn: Tantalum is an OK choice but is not the best choice. Tantalums were specified because Electrolytic can have their ESR increase up to 30x on very low temps. The 5v, 12v, and 15v regulator options are available in the steel to3 power package. Post as a guest Name. Also, how exactly does the ESR come into play here? This series of devices can be used with a series—pass transistor to boost output current capability at the nominal output voltage.

If a uF cap behaved as a series-parallel combination containing a series combination of an ideal 0.

Under the diagram on the front page they note “Required if the regulator is located far from the power supply filter” – to which you could add “or another well decoupled portion of the supply”. I’ve read this so many times – “maintain regulator stability”. An eg 10 ohm resistor could be placed in series with the capacitor without impeding its functionality. This requirement could be met by an aluminum wet electrolytic cap or a ceramic cap.


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Any capacitor which meets these specifications is suitable. Fixed output voltage regulator required if the regulator is located far from the power supply filter. See detailed ordering and shipping information in the package dimensions section on page 16 of this data sheet.

Symbol Min Typ Max. If I’ve missed something or made a significantly incorrect technical assertion then by all means say. Tantalum capacitors are datashet unnecessary in this application. If needed, use a 0.

LM340 Datasheet

I wasn’t criticising you – sorry if it seemed that way. Look at the output with an oscilloscope and you may see an eg kHz semi sine wave of ‘s of mV to some Volts of amplitude on a nominal 5VDC output. The LM datasheet eatasheet clear guidance on the essential and desirable characteristics of the input and output capacitors.