National Semiconductor LM112 LM212 LM312 Operational Amplifiers Data Sheet User's Guide
Summary
This datasheet describes the National Semiconductor LM112, LM212, and LM312 series of micropower operational amplifiers featuring supergain transistors for extremely low input bias current of 3nA maximum and offset current under 400pA over the full temperature range. These internally frequency-compensated amplifiers achieve at least ten times better input current performance than FET amplifiers across temperature. Operating from ±1V to ±20V supplies (or single 2V to 20V) with only 300μA quiescen
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LM112/LM212/LM312 Operational Amplifiers General Description
The LM112 series are micropower operational amplifiers known to suffer catastrophic failure caused by short-dura- with very low offset-voltage and input-current errorsÐat tion overvoltage spikes on the supplies. Unlike other inter- least factor of ten better than FET amplifiers over nally-compensated IC amplifiers, it is possible to overcom-
b55§C to a125§C temperature range. Similar to the LM108 pensate with an external capacitor to increase stability mar-
series, that also use supergain transistors, they differ in that gin.
they include internal frequency compensation and have pro- The LM212 is identical to the LM112, except that the LM212 visions for offset adjustment with single potentiometer. has its performance guaranteed over b25§C to a85§C
These amplifiers will operate on supply voltages of g2V to temperature range instead of b55§C to a125§C. The g20V, drawing quiescent current of only m A. Per- LM312 is guaranteed over 0§C to a70§C temperature
formance is not appreciably affected over this range of volt- range. ages, so operation from unregulated power sources is easily accomplished. They can also be run from single supply Features like the 5V used for digital circuits.
Maximum input bias current of n A over temperature
The LM112 series are the first IC amplifiers to improve reli- Offset current less than p A over temperature ability by including overvoltage protection for the MOS com-
Low noise
pensation capacitor. Without this feature, IC’s have been
Guaranteed drift specifications
Connection Diagram
Metal Can Package
TL/H/7751–4
Order Number LM112H, LM212H, LM312H or LM112H/883
See NS Package Number H08C
Auxiliary Circuits
Offset Balancing Overcompensation for Greater Stability Margin
TL/H/7751–2 TL/H/7751–3
C1995 National Semiconductor Corporation TL/H/7751 RRD-B30M115/Printed in U. S. A.
Page Summary Contents For National Semiconductor LM112 LM212 LM312 Operational Amplifiers Data Sheet User's Guide
Manual Details
| Brand | National |
|---|---|
| Pages | 6 |
| File Size | 201.32 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
Which operational amplifier model is best suited for high-temperature environments?
The LM112 series offers stability and performance guaranteed over the broadest range of 55°C to 125°C.
What precautions are needed when applying a differential input voltage?
If a differential input voltage in excess of 1V is applied, limiting resistance must be used to prevent excessive current flow.
Can these amplifiers operate successfully using an unregulated or single power supply?
Yes, they can run from unregulated power sources and are capable of operating from a single supply.
What unique protection feature improves the reliability of the LM112 series?
The LM112 series includes internal overvoltage protection for the MOS common-source transistors.