National Semiconductor LM108A LM208A LM308A Operational Amplifiers Data Sheets and Manuals
Summary
These precision operational amplifiers are ideal for designing highly stable analog circuitry, including sensitive integrators and precise time delay systems. The LM108A/LM208A series offers industry-leading low offset voltage and minimal drift across wide temperature ranges (up to 125°C). This manual provides comprehensive specifications, absolute maximum ratings, recommended compensation circuits, and electrical performance data necessary for professional electronics engineers tackling challenging signal processing applications.
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LM108A/LM208A/LM308A Operational Amplifiers General Description
The LM108/LM108A series are precision operational ampli- introducing less error than devices like the with k X fiers having specifications about factor of ten better than sources. Integrators with drifts less than m V/sec and FET amplifiers over their operating temperature range. In analog time delays in excess of one hour can be made us- addition to low input currents, these devices have extremely ing capacitors no larger than m F.
low offset voltage, making it possible to eliminate offset ad- The LM208A is identical to the LM108A, except that the justments, in most cases, and obtain performance ap- LM208A has its performance guaranteed over b25§C
proaching chopper stabilized amplifiers. a85§C b55§C a125§C.
temperature range, instead of to
The devices operate with supply voltages from g2V to The LM308A devices have slightly-relaxed specifications
g18V and have sufficient supply rejection to use unregulat- and performances over 0§C to a70§C temperature range.
ed supplies. Although the circuit is interchangeable with and uses the same compensation as the LM101A, an alternate Features compensation scheme can be used to make it particularly
Offset voltage guaranteed less than 0.5 m V
insensitive to power supply noise and to make supply by-
Maximum input bias current of 3.0 n A over temperature
pass capacitors unnecessary.
Offset current less than p A over temperature
The low current error of the LM108A series makes possible
Supply current of only m A, even in saturation
many designs that are not practical with conventional ampli-
Guaranteed m V/§C drift
fiers. In fact, it operates from MX source resistances,
Compensation Circuits
Standard Compensation Circuit Alternate* Frequency Compensation
R1 CO Cf R1a R2 *Improves rejection of power supply
CO p F noise by factor of ten.
TL/H/7759–1 TL/H/7759–2
**Bandwidth and slew rate are proportional to 1/Cf
**Bandwidth and slew rate are proportional to 1/Cs
Feedforward Compensation
TL/H/7759–3
C1995 National Semiconductor Corporation TL/H/7759 RRD-B30M115/Printed in U. S. A.
Page Summary Contents For National Semiconductor LM108A LM208A LM308A Operational Amplifiers Data Sheets and Manuals
Manual Details
| Brand | National |
|---|---|
| Pages | 8 |
| File Size | 159.01 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What distinguishes the LM308A amplifier range?
It has slightly relaxed specifications and performs reliably over a -0°C to 70°C temperature range.
Are there warnings about input voltage limits?
Yes, excessive current flows if a differential input voltage exceeds 1V unless limiting resistance is used for protection.
How must I handle high-temperature operation?
For operating at elevated temperatures, devices in the H08 package must be derated based on thermal resistance (e.g., 160 °C/W).
What makes LM108A series unique for design?
The low current error makes possible designs that are generally not practical with conventional amplifiers.