LM101A/LM201A/LM301A
Operational Amplifiers
General Description
The LM101A series are general purpose operational ampli-
fiers which feature improved performance over industry stan-
dards like the LM709. Advanced processing techniques
make possible an order of magnitude reduction in input
currents, and a redesign of the biasing circuitry reduces the
temperature drift of input current. Improved specifications
include:
•Offset voltage 3 mV maximum over temperature
(LM101A/LM201A)
•Input current 100 nA maximum over temperature
(LM101A/LM201A)
•Offset current 20 nA maximum over temperature
(LM101A/LM201A)
•Guaranteed drift characteristics
•Offsets guaranteed over entire common mode and sup-
ply voltage ranges
•Slew rate of 10V/µs as a summing amplifier
This amplifier offers many features which make its appli-
cation nearly foolproof: overload protection on the input
and output, no latch-up when the common mode range is
exceeded, and freedom from oscillations and compensa-
tion with a single 30 pF capacitor. It has advantages over
internally compensated amplifiers in that the frequency
compensation can be tailored to the particular applica-
tion. For example, 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 integrators or timers, sample and hold circuits
and low frequency waveform generators. Further, replac-
ing 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
−55˚C to +125˚C, the LM201A from −25˚C to +85˚C, and
the LM301A from 0˚C to +70˚C.
Fast AC/DC Converter
00775233
Note 1: Feedforward compensation can be used to make a fast full wave rectifier without a filter.
August 2000
LM101A/LM201A/LM301A Operational Amplifiers
© 2004 National Semiconductor Corporation DS007752 www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM101A/LM201A LM301A
Supply Voltage ±22V ±18V
Differential Input Voltage ±30V ±30V
Input Voltage (Note 3) ±15V ±15V
Output Short Circuit Duration (Note 4) Continuous Continuous
Operating Ambient Temp. Range −55˚C to +125˚C (LM101A) 0˚C to +70˚C
−25˚C to +85˚C (LM201A)
T
J
Max
H-Package 150˚C 100˚C
N-Package 150˚C 100˚C
J-Package 150˚C 100˚C
Power Dissipation at T
A
= 25˚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) θ
jA
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) θ
jC
H-Package 25˚C/W 25˚C/W
Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)
Metal Can or Ceramic 300˚C 300˚C
Plastic 260˚C 260˚C
ESD Tolerance (Note 7) 2000V 2000V
Electrical Characteristics (Note 5)
T
A
=T
J
Parameter Conditions LM101A/LM201A LM301A Units
Min Typ Max Min Typ Max
Input Offset Voltage T
A
= 25˚C, R
S
≤50 kΩ0.7 2.0 2.0 7.5 mV
Input Offset Current T
A
= 25˚C 1.5 10 3.0 50 nA
Input Bias Current T
A
= 25˚C 30 75 70 250 nA
Input Resistance T
A
= 25˚C 1.5 4.0 0.5 2.0 MΩ
Supply Current T
A
= 25˚C V
S
=±20V 1.8 3.0 mA
V
S
=±15V 1.8 3.0 mA
Large Signal Voltage Gain T
A
= 25˚C, V
S
=±15V 50 160 25 160 V/mV
V
OUT
=±10V, R
L
≥2kΩ
Input Offset Voltage R
S
≤50 kΩ3.0 10 mV
Average Temperature Coefficient R
S
≤50 kΩ3.0 15 6.0 30 µV/˚C
of Input Offset Voltage
Input Offset Current 20 70 nA
Average Temperature Coefficient 25˚C ≤T
A
≤T
MAX
0.01 0.1 0.01 0.3 nA/˚C
of Input Offset Current T
MIN
≤T
A
≤25˚C 0.02 0.2 0.02 0.6 nA/˚C
Input Bias Current 0.1 0.3 µA
LM101A/LM201A/LM301A
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Electrical Characteristics (Note 5) (Continued)
T
A
=T
J
Parameter Conditions LM101A/LM201A LM301A Units
Min Typ Max Min Typ Max
Supply Current T
A
=T
MAX
,V
S
=±20V 1.2 2.5 mA
Large Signal Voltage Gain V
S
=±15V, V
OUT
=±10V 25 15 V/mV
R
L
≥2k
Output Voltage Swing V
S
=±15V R
L
=10kΩ±12 ±14 ±12 ±14 V
R
L
=2kΩ±10 ±13 ±10 ±13 V
Input Voltage Range V
S
=±20V ±15 V
V
S
=±15V +15, −13 ±12 +15, −13 V
Common-Mode Rejection Ratio R
S
≤50 kΩ80 96 70 90 dB
Supply Voltage Rejection Ratio R
S
≤50 kΩ80 96 70 96 dB
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating ratings indicate for which the device is functional, but
do no guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee
specific limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the
typical value is a good indication of device performance.
Note 3: For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
Note 4: 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 5: Unless otherwise specified, these specifications apply for C1 = 30 pF, ±5V ≤VS≤±20V and −55˚C ≤TA≤+125˚C (LM101A), ±5V ≤VS≤±20V and −25˚C
≤TA≤+85˚C (LM201A), ±5V ≤VS≤±15V and 0˚C ≤TA≤+70˚C (LM301A).
Note 6: Refer to RETS101AX for LM101A military specifications and RETS101X for LM101 military specifications.
Note 7: Human body model, 100 pF discharged through 1.5 kΩ.
Typical Performance Characteristics
LM101A/LM201A
Input Voltage Range Output Swing
00775241
00775242
LM101A/LM201A/LM301A
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Typical Performance Characteristics LM101A/LM201A (Continued)
Voltage Gain
00775243
Guaranteed Performance Characteristics
LM301A
Input Voltage Range Output Swing
00775244 00775245
Voltage Gain
00775246
LM101A/LM201A/LM301A
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Typical Performance Characteristics
Supply Current Voltage Gain
00775247 00775248
Maximum Power Dissipation
Input Current,
LM101A/LM201A/LM301A
00775249 00775250
Current Limiting Input Noise Voltage
00775251
00775252
LM101A/LM201A/LM301A
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Typical Performance Characteristics (Continued)
Input Noise Current Common Mode Rejection
00775253 00775254
Power Supply Rejection
Closed Loop Output
Impedance
00775255
00775256
LM101A/LM201A/LM301A
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Typical Performance Characteristics for Various Compensation Circuits
(Note 9)
Single Pole Compensation Two Pole Compensation
00775208
CS=30pF
00775212
CS=30pF
C2=10C1
Feedforward Compensation
Open Loop Frequency
Response
00775216
fo= 3 MHz
00775209
Open Loop Frequency
Response
Open Loop Frequency
Response
00775213 00775217
LM101A/LM201A/LM301A
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Typical Performance Characteristics for Various Compensation Circuits
(Note 9) (Continued)
Large Signal Frequency
Response
Large Signal Frequency
Response
00775210 00775214
Large Signal Frequency
Response
Voltage Follower Pulse
Response
00775218 00775211
Voltage Follower Pulse
Response Inverter Pulse Response
00775215 00775219
LM101A/LM201A/LM301A
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Typical Applications (Note 9)
Variable Capacitance Multiplier
00775220
Simulated Inductor
00775221
L.R1 R2 C1
RS=R2
RP=R1
Fast Inverting Amplifier
with High Input Impedance
00775222
Inverting Amplifier
with Balancing Circuit
00775223
†May be zero or equal to parallel combination of R1 and R2 for minimum
offset.
Sine Wave Oscillator
00775224
fo=10kHz
Integrator with Bias Current Compensation
00775225
*Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over −55˚C
to +125˚C temperature range.
LM101A/LM201A/LM301A
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Application Hints (Note 9)
Protecting Against Gross
Fault Conditions
00775226
*Protects input
†Protects output
‡Protects output — not needed when R4 is used.
Compensating for Stray Input Capacitances
or Large Feedback Resistor
00775227
Isolating Large Capacitive Loads
00775228
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
LM101A/LM201A/LM301A
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advice given here is applicable to practically any IC op amp,
although the exact reason why may differ with different de-
vices.
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 µF) 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 voltage. How-
ever, 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
reversed — even under transient conditions. With reverse
voltages greater than 1V, the IC will conduct excessive cur-
rent, fusing 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. Rever-
sal of the voltage between V
+
and V
−
will always cause a
problem, 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 kΩ, 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 over-
compensate the amplifier with a larger compensation capaci-
tor. 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 added 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.
Typical Applications (Note 9)
Standard Compensation and
Offset Balancing Circuit
00775229
Fast Voltage Follower
00775231
Power Bandwidth: 15 kHz
Slew Rate: 1V/µs
Fast Summing Amplifier
00775230
Power Bandwidth: 250 kHz
Small Signal Bandwiidth: 3.5 MHz
Slew Rate: 10V/µs
LM101A/LM201A/LM301A
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Typical Applications (Note 9) (Continued)
Instrumentation Amplifier
00775234
R1 = R4; R2 = R3
*,†Matching determines CMRR.
Integrator with Bias Current Compensation
00775235
*Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over 0˚C to
+70˚C temperature range.
Voltage Comparator for Driving RTL Logic or High
Current Driver
00775237
LM101A/LM201A/LM301A
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Schematic (Note 9)
00775201
Note 9: Pin connections shown are for 8-pin packages.
Connection Diagrams
(Top View)
Dual-In-Line Package
00775204
Order Number LM101AJ, LM101J/883 (Note 10),
LM201AN or LM301AN
See NS Package Number J08A or N08E
Ceramic Flatpack Package
00775240
Order Number LM101AW/883 or LM101W/883
See NS Package Number W10A
LM101A/LM201A/LM301A
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Connection Diagrams (Top
View) (Continued)
Metal Can Package
00775202
Note: Pin 4 connected to case.
Order Number LM101AH, LM101AH/883 (Note 10),
LM201AH or LM301AH
See NS Package Number H08C
Dual-In-Line Package
00775203
Order Number LM101AJ-14/883 (Note 10)
See NS Package Number J14A
Note 10: Available per JM38510/10103.
LM101A/LM201A/LM301A
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Physical Dimensions inches (millimeters)
unless otherwise noted
Metal Can Package (H)
Order Number LM101AH, LM101AH/883
LM201AH or LM301AH
NS Package Number H08C
LM101A/LM201A/LM301A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Ceramic Dual-In-Line Package (J)
Order Number LM101J/883 or LM101AJ
NS Package Number J08A
Ceramic Dual-In-Line Package (J)
Order Number LM101AJ-14/883
NS Package Number J14A
LM101A/LM201A/LM301A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM201AN or LM301AN
NS Package Number N08E
Ceramic Flatpack Package (W)
Order Number LM101AW/883 or LM101W/883
NS Package Number W10A
LM101A/LM201A/LM301A
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Notes
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support device or system whose failure to perform
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LM101A/LM201A/LM301A Operational Amplifiers
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