Engineering reality check
Op-amp operating-range checker
Choose an original Texas Instruments part, then enter your DC circuit conditions. This is a screening tool, not a circuit simulation or design approval.
Your voltage ranges
The horizontal scale runs from V− to V+. Colored bars show your entered signal ranges, not the op-amp's guaranteed operating limits. Portions outside the rails are clipped in this illustration.
Scale spans 5 V. The visualization does not establish input common-mode compatibility or output swing under load.
Assessment
Supply voltage is outside this device's listed operating range
Your supply is 5 V, but the original TI LM741 lists 10–44 V total. Changing the input or output signal will not resolve this supply limitation. Select a specified supply or a different amplifier before proceeding.
Supply voltage: Outside limit
Total supply 5 V; TI-listed operating range 10–44 V. This is not an absolute-maximum-rating check.
Ideal closed-loop output: Within checked limits
Ideal follower output: 1 V to 2 V. Desired output: 1 V to 2 V. The ideal calculation ignores output headroom and saturation.
Input common-mode: Insufficient data
The available device-specific limits cannot be safely generalized to the entered supply and temperature. Consult the relevant electrical-characteristics table.
Output swing under load: Insufficient data
Requested 1 V to 2 V at 10 kΩ nominal load. The checker does not extrapolate guaranteed output swing across different supplies, loads, temperatures or variants. Verify the datasheet test conditions.
TI LM741 product specification: total supply 10–44 V. Input and output headroom values on the product page are typical, not guaranteed across arbitrary conditions. Read the manufacturer specification. This tool does not check input differential voltage, power dissipation, frequency response, phase reversal, offset, stability, capacitive loading or safe operation outside recommended conditions.
Why This Decision Matters
An op-amp can have enough total supply voltage and still fail to process the intended signal. The input common-mode range and the available output swing are separate constraints. The useful question is not just whether the part powers up, but whether its specified operating conditions cover the proposed circuit.
This guide focuses on DC operating-range screening for three original Texas Instruments devices. It does not replace the exact datasheet or prove that a completed circuit will function.
Operating Envelope
Check supply, input and output separately.
Link copiedSupply: Compare V+ minus V− with the device operating range. Do not substitute absolute maximum ratings for recommended operating conditions.
Input common-mode: An amplifier can be powered correctly but have an input voltage outside the range in which its specified behavior applies. The common-mode range is not interchangeable with the absolute maximum input voltage.
Output swing: The output may stop short of one or both supply rails. Its usable range depends on load, supply and temperature. A typical headroom value is not a universal guaranteed limit.
A crucial distinction
The checker reports a supply or ideal rail violation when one is clear. If output swing cannot be established under matching conditions, the correct answer is insufficient data, not a green pass.
Part Identity
A familiar part number is not a complete specification.
Link copiedThe original LM358 and the LM358B are different versions. Likewise, the original TL072 and TL072H have materially different operating characteristics. Do not apply a newer device's limits to an older part simply because the names look similar.
Check the complete ordering code, manufacturer, temperature grade and package before finalizing the circuit. The pilot models only original TI LM741, LM358 and TL072 families and does not verify every package or operating temperature.
Worked Examples
Two cases where a datasheet detail changes the answer.
Link copiedLM741 with 0–5 V supply
TI lists a minimum total supply of 10 V for the LM741. A 0–5 V supply provides only 5 V, so this fails the supply operating-range screen before input and output questions are considered.
LM358 with 0–5 V supply
Five volts is within the original LM358 supply range. But TI's common-mode specification over its 0–70°C operating range reaches only to approximately V+ minus 2 V under the stated conditions. A 4 V non-inverting input on a 5 V supply therefore exceeds that checked range. Output swing still needs separate verification.
Technical Boundaries
A checked limit is not a complete circuit validation.
Link copiedThe ideal non-inverting gain model assumes feedback referenced to the negative supply and does not account for resistor tolerances, offsets or saturation. The tool does not compute both input-pin voltages or establish the circuit's closed-loop stability.
It also does not evaluate slew rate, gain-bandwidth product, phase reversal, input protection, output current, thermal dissipation or capacitive-load stability. Output load is collected to make the limitation explicit, not to claim an unsupported load-dependent pass.
If you need a definitive operating envelope, compare the actual circuit conditions with the manufacturer's electrical-characteristics tables, notes and application guidance. Test a prototype where appropriate.
Before You Build
Take these steps before making your decision.
- Identify the exact manufacturer and part suffix.
- Calculate the total supply voltage from V+ and V−.
- Check the recommended supply range, not just absolute maximum ratings.
- Check the input common-mode limits under applicable conditions.
- Calculate the ideal output range and compare it with both rails.
- Verify output swing at the actual load and supply conditions.
- Check temperature, input differential voltage and other unmodeled limits.
- Review stability, bandwidth, offset and noise separately.
- Use the manufacturer datasheet as the final technical reference.
Questions to Ask Before Selecting an Op-Amp
Have a better conversation.
Use these questions to identify the specification that matters for your circuit.
Is this the original device or a newer suffix variant?
What are my positive and negative supply rails?
What voltages appear at both input pins during normal operation and startup?
Does the input common-mode range include those voltages?
What output voltage is required at the intended load?
Are the datasheet output limits guaranteed or only typical?
Do the listed test supply and temperature match my conditions?
What additional AC, stability and protection checks does the circuit require?
Key Takeaways
- Supply compatibility alone does not prove that an op-amp can process your signal.
- Input common-mode and output swing are independent operating constraints.
- Original LM741, LM358 and TL072 specifications must not be silently mixed with newer suffix variants.
- Guaranteed values apply only under their stated test conditions.
- Insufficient data is a meaningful result when a reliable pass cannot be established.
Related Decisions
You may also be deciding...
Northward Meridian
Browse all decision guides
Explore practical frameworks for home, business, technology, personal finance, and other consequential decisions.
View all guides