LM101A/LM201A/LM301A Operational Amplifiers
December 1994
LM101A/LM201A/LM301A Operational Amplifiers
General Description
The LM101A series are general purpose operational amplifi-
ers which feature improved performance over industry stan-
dards like the LM709. Advanced processing techniques
make possible an order of magnitude reduction in input cur-
rents, and a redesign of the biasing circuitry reduces the
temperature drift of input current. Improved specifications
YOffset voltage 3 mV maximum over
temperature (LM101A/LM201A)
YInput current 100 nA maximum over
temperature (LM101A/LM201A)
YOffset current 20 nA maximum over
temperature (LM101A/LM201A)
YGuaranteed drift characteristics
YOffsets guaranteed over entire common mode and sup-
ply voltage ranges
YSlew rate of 10V/ms as a summing amplifier
This amplifier offers many features which make its applica-
tion nearly foolproof: overload protection on the input and
output, no latch-up when the common mode range is ex-
ceeded, and freedom from oscillations and compensation
with a single 30 pF capacitor. It has advantages over inter-
nally compensated amplifiers in that the frequency compen-
sation can be tailored to the particular application. For ex-
ample, in low frequency circuits it can be overcompensated
for increased stability margin. Or the compensation can be
optimized to give more than a factor of ten improvement in
high frequency performance for most applications.
In addition, the device provides better accuracy and lower
noise in high impedance circuitry. The low input currents
also make it particularly well suited for long interval integra-
tors or timers, sample and hold circuits and low frequency
waveform generators. Further, replacing circuits where
matched transistor pairs buffer the inputs of conventional IC
op amps, it can give lower offset voltage and a drift at a
lower cost.
The LM101A is guaranteed over a temperature range of
125§C, the LM201A from b25§Ctoa
and the LM301A from 0§Ctoa
Connection Diagrams (Top View)
Dual-In-Line Package
TL/H/7752 4
Order Number LM101AJ, LM101J/883*,
LM201AN or LM301AN
See NS Package Number J08A or N08A
Ceramic Flatpack Package
TL/H/7752 4
Order Number LM101AW/883 or LM101W/883
See NS Package Number W10A
Metal Can Package
TL/H/7752 2
Note: Pin 4 connected to case.
Order Number LM101AH,
LM101AH/883*, LM201AH or LM301AH
See NS Package Number H08C
Dual-In-Line Package
TL/H/7752 3
Order Number LM101AJ-14/883*
See NS Package Number J14A
*Available per JM38510/10103.
C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM101A/LM201A LM301A
Supply Voltage g22V g18V
Differential Input Voltage g30V g30V
Input Voltage (Note 1) g15V g15V
Output Short Circuit Duration (Note 2) Continuous Continuous
Operating Ambient Temp. Range b55§Ctoa
125§C (LM101A) 0§Ctoa
85§C (LM201A)
H-Package 150§C 100§C
N-Package 150§C 100§C
J-Package 150§C 100§C
Power Dissipation at TAe25§C
H-Package (Still Air) 500 mW 300 mW
(400 LF/Min Air Flow) 1200 mW 700 mW
N-Package 900 mW 500 mW
J-Package 1000 mW 650 mW
Thermal Resistance (Typical) ijA
H-Package (Still Air) 165§C/W 165§C/W
(400 LF/Min Air Flow) 67§C/W 67§C/W
N Package 135§C/W 135§C/W
J-Package 110§C/W 110§CmW
(Typical) ijC
H-Package 25§C/W 25§C/W
Storage Temperature Range b65§Ctoa
Lead Temperature (Soldering, 10 sec.)
Metal Can or Ceramic 300§C 300§C
Plastic 260§C 260§C
ESD Tolerance (Note 5) 2000V 2000V
Electrical Characteristics (Note 3) TAeTJ
Parameter Conditions LM101A/LM201A LM301A Units
Min Typ Max Min Typ Max
Input Offset Voltage TAe25§C, RSs50 kX0.7 2.0 2.0 7.5 mV
Input Offset Current TAe25§C 1.5 10 3.0 50 nA
Input Bias Current TAe25§C 30 75 70 250 nA
Input Resistance TAe25§C 1.5 4.0 0.5 2.0 MX
Supply Current TAe25§CV
20V 1.8 3.0 mA
VSeg15V 1.8 3.0 mA
Large Signal Voltage Gain TAe25§C, VSeg15V 50 160 25 160 V/mV
VOUT eg10V, RLt2kX
Input Offset Voltage RSs50 kX3.0 10 mV
Average Temperature Coefficient RSs50 kX3.0 15 6.0 30 mV/§C
of Input Offset Voltage
Input Offset Current 20 70 nA
Average Temperature Coefficient 25§CsTAsTMAX 0.01 0.1 0.01 0.3 nA/§C
of Input Offset Current TMIN sTAs25§C0.02 0.2 0.02 0.6 nA/§C
Electrical Characteristics (Note 3) TAeTJ(Continued)
Parameter Conditions LM101A/LM201A LM301A Units
Min Typ Max Min Typ Max
Input Bias Current 0.1 0.3 mA
Supply Current TAeTMAX,V
20V 1.2 2.5 mA
Large Signal Voltage Gain VSeg15V, VOUT eg10V 25 15 V/mV
Output Voltage Swing VSeg15V RLe10 kXg12 g14 g12 g14 V
10 g13 g10 g13 V
Input Voltage Range VSeg20V g15 V
VSeg15V a15, b13 g12 a15, b13 V
Common-Mode Rejection Ratio RSs50 kX80 96 70 90 dB
Supply Voltage Rejection Ratio RSs50 kX80 96 70 96 dB
Note 1: For supply voltages less than g15V, the absolute maximum input voltage is equal to the supply voltage.
Note 2: Continuous short circuit is allowed for case temperatures to 125§C and ambient temperatures to 75§C for LM101A/LM201A, and 70§C and 55§C
respectively for LM301A.
Note 3: Unless otherwise specified, these specifications apply for C1 e30 pF, g5V sVSsg20V and b55§CsTAsa125§C (LM101A), g5V sVSsg20V
and b25§CsTAsa85§C (LM201A), g5V sVSsg15V and 0§CsTAsa70§C (LM301A).
Note 4: Refer to RETS101AX for LM101A military specifications and RETS101X for LM101 military specifications.
Note 5: Human body model, 100 pF discharged through 1.5 kX.
Guaranteed Performance Characteristics LM101A/LM201A
Input Voltage Range Output Swing Voltage Gain
TL/H/7752 5
Guaranteed Performance Characteristics LM301A
Input Voltage Range Output Swing Voltage Gain
TL/H/7752 6
Typical Performance Characteristics
Supply Current Voltage Gain Maximum Power Dissipation
Input Current,
Current Limiting Input Noise Voltage
Input Noise Current Common Mode Rejection Power Supply Rejection
Closed Loop Output
TL/H/7752 7
Typical Performance Characteristics for Various Compensation Circuits**
Single Pole Compensation
TL/H/7752 8
C1 tR1 CS
R1 aR2
CSe30 pF
Two Pole Compensation
C1 tR1 CS
R1 aR2
CSe30 pF
C2 e10 C1
TL/H/7752 12
Feedforward Compensation
C2 e1
foe3 MHz
TL/H/7752 16
Open Loop Frequency
TL/H/7752 9
Open Loop Frequency
TL/H/7752 13
Open Loop Frequency
TL/H/7752 17
Large Signal Frequency
TL/H/7752 10
Large Signal Frequency
TL/H/7752 14
Large Signal Frequency
TL/H/7752 18
Voltage Follower Pulse
TL/H/7752 11
Voltage Follower Pulse
TL/H/7752 15
Inverter Pulse Response
TL/H/7752 19
**Pin connections shown are for 8-pin packages.
Typical Applications**
Variable Capacitance Multiplier
TL/H/7752 20
Simulated Inductor
LjR1 R2 C1
TL/H/7752 21
Fast Inverting Amplifier
with High Input Impedance
TL/H/7752 22
Inverting Amplifier
with Balancing Circuit
²May be zero or equal
to parallel combina-
tion of R1 and R2 for
minimum offset.
TL/H/7752 23
Integrator with Bias Current
Sine Wave Oscillator
TL/H/7752 25
*Adjust for zero integrator drift. Current drift typically
0.1 nA/§C over b55§Ctoa
125§C temperature range.
foe10 kHz
TL/H/7752 24
**Pin connections shown are for 8-pin packages.
Application Hints**
Protecting Against Gross
Fault Conditions
*Protects input
²Protects output TL/H/7752 26
³Protects outputÐnot needed when R4 is used.
Compensating for Stray Input Capacitances
or Large Feedback Resistor
C2 eR1 CS
TL/H/7752 27
Isolating Large Capacitive Loads
TL/H/7752 28
Although the LM101A is designed for trouble free operation,
experience has indicated that it is wise to observe certain
precautions given below to protect the devices from abnor-
mal operating conditions. It might be pointed out that the
advice given here is applicable to practically any IC op amp,
although the exact reason why may differ with different de-
When driving either input from a low-impedance source, a
limiting resistor should be placed in series with the input
lead to limit the peak instantaneous output current of the
source to something less than 100 mA. This is especially
important when the inputs go outside a piece of equipment
where they could accidentally be connected to high voltage
sources. Large capacitors on the input (greater than 0.1 mF)
should be treated as a low source impedance and isolated
with a resistor. Low impedance sources do not cause a
problem unless their output voltage exceeds the supply volt-
age. However, the supplies go to zero when they are turned
off, so the isolation is usually needed.
The output circuitry is protected against damage from shorts
to ground. However, when the amplifier output is connected
to a test point, it should be isolated by a limiting resistor, as
test points frequently get shorted to bad places. Further,
when the amplifer drives a load external to the equipment, it
is also advisable to use some sort of limiting resistance to
preclude mishaps.
Precautions should be taken to insure that the power sup-
plies for the integrated circuit never become reversedÐ
even under transient conditions. With reverse voltages
greater than 1V, the IC will conduct excessive current, fus-
ing internal aluminum interconnects. If there is a possibility
of this happening, clamp diodes with a high peak current
rating should be installed on the supply lines. Reversal of
the voltage between Vaand Vbwill always cause a prob-
lem, although reversals with respect to ground may also
give difficulties in many circuits.
The minimum values given for the frequency compensation
capacitor are stable only for source resistances less than
10 kX, stray capacitances on the summing junction less
than 5 pF and capacitive loads smaller than 100 pF. If any
of these conditions are not met, it becomes necessary to
overcompensate the amplifier with a larger compensation
capacitor. Alternately, lead capacitors can be used in the
feedback network to negate the effect of stray capacitance
and large feedback resistors or an RC network can be add-
ed to isolate capacitive loads.
Although the LM101A is relatively unaffected by supply by-
passing, this cannot be ignored altogether. Generally it is
necessary to bypass the supplies to ground at least once on
every circuit card, and more bypass points may be required
if more than five amplifiers are used. When feed-forward
compensation is employed, however, it is advisable to by-
pass the supply leads of each amplifier with low inductance
capacitors because of the higher frequencies involved.
**Pin connections shown are for 8-pin packages.
Typical Applications** (Continued)
Standard Compensation and
Offset Balancing Circuit
TL/H/7752 29
Fast Summing Amplifier
Power Bandwidth: 250 kHz
Small Signal Bandwiidth: 3.5 MHz
Slew Rate: 10V/ms
TL/H/7752 30
Fast Voltage Follower
Power Bandwidth: 15 kHz
Slew Rate: 1V/ms
TL/H/7752 31
Bilateral Current Source
R1 R5
R3 eR4 aR5
R1 eR2
TL/H/7752 32
Fast AC/DC Converter*
*Feedforward compensation
can be used to make a fast full
wave rectifier without a filter.
TL/H/7752 33
**Pin connections shown are for 8-pin packages.
Typical Applications** (Continued)
Instrumentation Amplifier
R1 eR4; R2 eR3
*,²Matching determines CMRR.
TL/H/7752 34
Integrator with Bias Current Compensation
*Adjust for zero integrator
drift. Current drift typically
0.1 nA/§C over 0§Ctoa
temperature range.
TL/H/7752 35
Voltage Comparator for Driving RTL Logic or
High Current Driver
TL/H/7752 37
Low Frequency Square Wave Generator
TL/H/7752 36
**Pin connections shown are for 8-pin packages.
Typical Applications** (Continued)
Low Drift Sample and Hold
*Polycarbonate-dielectric capacitor
TL/H/7752 38
Voltage Comparator for Driving
DTL or TTL Integrated Circuits
TL/H/7752 39
TL/H/7752 1
**Pin connections shown are for 8-pin packages.
Physical Dimensions inches (millimeters)
Metal Can Package (H)
Order Number LM101AH, LM101AH/883
LM201AH or LM301AH
NS Package Number H08C
Ceramic Dual-In-Line Package (J)
Order Number LM101J/883 or LM101AJ
NS Package Number J08A
Physical Dimensions inches (millimeters) (Continued)
Ceramic Dual-In-Line Package (J)
Order Number LM101AJ-14/883
NS Package Number J14A
Molded Dual-In-Line Package (N)
Order Number LM201AN or LM301AN
NS Package Number N08E
LM101A/LM201A/LM301A Operational Amplifiers
Physical Dimensions inches (millimeters) (Continued)
Ceramic Flatpack Package (W)
Order Number LM101AW/883 or LM101W/883
NS Package Number W10A
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