Real View
LM358Dual operational amplifier
Give a small analog signal a useful gain.
LM358 contains two independent operational amplifiers in one eight-pin package. Both channels share the supply pins. Negative feedback sets a useful closed-loop gain. The inputs can operate near ground, but the output does not reach the positive supply rail. This page covers the classic LM358P in PDIP-8 and LM358D in SOIC-8.
OutputsSignal inputsSupply & return
LM358PPDIP-8Top view
LM358DSOIC-8Top view
Click a lead or use the arrow keys. Top view
PIN 1 · Outputs
OutputOUT1
Function
Amplifier A output.
How to connect
Feed back to IN1− through Rf; connect the measured output here.
Electrical note
Allow output headroom; do not treat it as a rail-to-rail output.
PIN 2 · Signal inputs
Inverting inputIN1−
Function
Amplifier A feedback input.
How to connect
Connect the junction of Rf and Rg here.
Electrical note
Negative feedback controls the gain while the amplifier is operating linearly.
PIN 3 · Signal inputs
Non-inverting inputIN1+
Function
Amplifier A signal input.
How to connect
Connect the input signal and its common ground.
Electrical note
Keep within the recommended common-mode range.
PIN 4 · Supply & return
Supply returnV−
Function
Lowest supply potential for both channels.
How to connect
Connect to ground in the illustrated single-supply circuit.
PIN 5 · Signal inputs
Non-inverting inputIN2+
Function
Amplifier B signal input.
How to connect
In this example, connect to VIN so the spare channel acts as a buffer.
PIN 6 · Signal inputs
Inverting inputIN2−
Function
Amplifier B feedback input.
How to connect
Connect directly to OUT2 for a unity-gain follower.
PIN 7 · Outputs
OutputOUT2
Function
Amplifier B output.
How to connect
Connect to IN2−; leave the buffered output otherwise unloaded.
Electrical note
Do not tie the two outputs together.
PIN 8 · Supply & return
Positive supplyV+
Function
Highest supply potential for both channels.
How to connect
Connect to +5 V and place a 100 nF bypass capacitor to pin 4 nearby.
At a glance
Dual operational amplifier
One package, two signal paths. Set their gains with external feedback.
3–30 VRecommended supply
0.7 MHz · typicalGain-bandwidth product
0–70 °CAmbient range
2 channelsIndependent amplifiers
Operating profile
LM358P
Operating conditions
Key parameters and their test conditions
- Supply difference
- 3–30 VConditions / notes: Recommended operating range
- Ambient temperature
- 0–70°CConditions / notes: LM358 grade
- Input common-mode range
- V− to V+ − 2 VConditions / notes: Recommended operating conditions
- Supply absolute maximum
- 32 VConditions / notes: Stress rating, not an operating target
Package details
Follows the selected physical package
- Manufacturer
- Texas Instruments
- Part number
- LM358P
- Package
- PDIP-8
- Connections
- 8 pins
- Mounting
- Through-hole
- Lead pitch
- 2.54 mm
- Package code
- P
- Thermal reference
- Board-dependent; see TI thermal table
Connections by function
Select a pin to open its function, electrical notes and wiring guidance.
Outputs2 pins
Signal inputs4 pins
Supply & return2 pins
Outputs2 pins
Signal inputs4 pins
Supply & return2 pins
Compare the inputs
The amplifier responds to the difference between its + and − inputs. A small difference can produce a large output change without feedback.
Close the feedback loop
Rf returns part of OUT1 to IN1−. Rg connects that node to ground. In the linear region, the circuit settles with approximately equal input voltages.
Read the result
With Rf = 20 kΩ and Rg = 10 kΩ, the ideal gain is 3. An input of 0.50 V requests 1.50 V at the output. Raising the input eventually runs into the output headroom.
Gain equations apply while the inputs and output stay in their valid ranges. This DC explorer illustrates headroom; the linked ProTech example models the running circuit.
Try the amplifier
Change the input and feedback. See the gain and output respond.
Closed-loop gain—
Ideal output—
Estimated output—
Enable JavaScript to explore the amplifier.
Estimated outputIdeal gainInput outside recommended range
Gain = 1 + Rf / Rg · VOUT(ideal) = VIN × Gain
Illustrative DC model at 5 V with a light load: 3.50 V upper output and 0.02 V lower output. Real headroom depends on load, temperature and part variation. Offset, bandwidth, slew rate and noise are omitted; use the ProTech example for a running simulation.
Pin reference
Select a pin to explore its function and connection.
8 pins
| Pin | Signal | Type | Function |
|---|---|---|---|
| OUT1 | Output | Amplifier A output. | |
| IN1− | Inverting input | Amplifier A feedback input. | |
| IN1+ | Non-inverting input | Amplifier A signal input. | |
| V− | Supply return | Lowest supply potential for both channels. | |
| IN2+ | Non-inverting input | Amplifier B signal input. | |
| IN2− | Inverting input | Amplifier B feedback input. | |
| OUT2 | Output | Amplifier B output. | |
| V+ | Positive supply | Highest supply potential for both channels. |
No pins match. Try a signal name or choose All pins.
Operating conditions
Classic LM358P / LM358D
Manufacturer specifications 4 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply difference | 3–30 V | Recommended operating range |
| Ambient temperature | 0–70°C | LM358 grade |
| Input common-mode range | V− to V+ − 2 V | Recommended operating conditions |
| Supply absolute maximum | 32 V | Stress rating, not an operating target |
No specifications match. Try a parameter name or a unit.
TI SLOS068AB, sections 5.1 and 5.3.
Electrical characteristics
Typical values are not production guarantees
Manufacturer specifications 7 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Gain-bandwidth product | 0.7 MHz typical | Classic LM358 |
| Slew rate | 0.3 V/µs typical | Unity gain |
| Input offset voltage | 3 mV typical; 7 mV maximum | 25°C; see manufacturer test conditions |
| Input bias current | 20 nA typical magnitude | 25°C |
| Supply current | 350 µA typical per channel | 5 V; unloaded; 0–70°C test row |
| High-side output headroom | 1.5 V typical | 5 V supply, RL ≥ 2 kΩ |
| Near-ground output | 5 mV typical; 20 mV maximum | 5 V; RL ≤ 10 kΩ; 0–70°C |
No specifications match. Try a parameter name or a unit.
TI SLOS068AB, section 5.7. Conditions differ between rows; consult the PDF before selecting a part.
Gain and example readings
Non-inverting DC example
Manufacturer specifications 5 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Closed-loop gain | 1 + Rf / Rg | Within the linear operating region |
| Example resistors | Rf = 20 kΩ; Rg = 10 kΩ | Gain = 3 |
| Example input / ideal output | 0.50 V / 1.50 V | Calculated, not a measured result |
| Explorer clipping ceiling | 3.50 V | Illustrative 5 V − 1.5 V headroom |
| Explorer input limit | 3.00 V | 5 V − 2 V recommended common-mode headroom |
No specifications match. Try a parameter name or a unit.
The explorer uses a fixed DC headroom approximation. It omits offset, bias, noise, frequency, temperature and load-dependent effects.
Package reference
LM358P · PDIP-8
Manufacturer specifications 4 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Mounting | Through-hole | Selected physical package |
| Lead pitch | 2.54 mm | Check land pattern dimensions before PCB manufacture |
| Pin mapping | 8 numbered pins | Same functions in PDIP-8 and SOIC-8 |
| Orientation | Top view | Use the notch / pin-1 marker |
No specifications match. Try a parameter name or a unit.
The package selector updates all four views together.
Sensor signal conditioning
Apply a small analog sensor output to a non-inverting stage. Choose gain for the signal range, ADC reference and available output swing.
Manufacturer application guideVoltage buffer
Use a follower when the voltage should remain similar but the following circuit needs a lower source impedance. Check input and output limits.
Manufacturer application guideActive low-pass filter
Combine resistance, capacitance and feedback to filter a slow signal. Evaluate bandwidth, loading and settling in the complete circuit.
Manufacturer application guideTake it into ProTech
Find LM358 in the Components Library to place its schematic symbol and connect its pins.
Simulation model available · Open the adjustable amplifierOpen ProTech