Compare LM741 and LM358 in terms of input common-mode range, output swing, supply requirements, and typical applications.

Compare LM741 and LM358 in terms of input common-mode range, output swing, supply requirements, and typical applications.

• A. LM741 requires dual supplies and has limited input common-mode range near ground; output cannot swing to rails. LM358 supports single-supply operation with input common-mode including ground and output near ground; LM358 is common in low-cost single-supply circuits; 741 is general-purpose with dual rails.
• B. LM741 operates only on single supply; LM358 cannot operate on single supply; both have rail-to-rail output.
• C. LM741 has rail-to-rail input; LM358 requires dual supplies for operation.
• D. LM358 has limited bandwidth compared to LM741 and is unsuitable for single-supply applications.

Answer: (A)

The important idea is how input range, output swing, and power supply needs determine which amplifier is suitable for single-supply, ground-referenced signals versus dual-supply setups. The LM741 is an older bipolar op-amp that expects dual supplies and cannot sense inputs all the way to the rails. Its input common-mode range stays well inside the rails, so with a single supply you can’t bring inputs down to ground, and with typical dual supplies the inputs still need headroom away from the rails. Its output also cannot swing to the supply rails, often being a couple of volts away from either rail. All of this makes the 741 ill-suited for low-voltage, single-supply circuits where signals swing around ground. The LM358 is designed for single-supply operation and can handle input voltages that include ground. Its input common-mode range extends down to the negative rail, and the output can swing close to ground (within tens of millivolts under light loads), making it very practical for battery-powered and low-cost circuits. It can run from a wide single supply (roughly 3 to 32 volts), which is a big contrast to the 741’s dual-supply requirement. So the described traits—dual supplies and limited input range near ground for the 741, versus single-supply capability, ground-inclusive input range, and near-ground output for the 358—make the first option the best fit. The other statements misstate rail-to-rail capabilities or supply requirements for these parts.

The important idea is how input range, output swing, and power supply needs determine which amplifier is suitable for single-supply, ground-referenced signals versus dual-supply setups. The LM741 is an older bipolar op-amp that expects dual supplies and cannot sense inputs all the way to the rails. Its input common-mode range stays well inside the rails, so with a single supply you can’t bring inputs down to ground, and with typical dual supplies the inputs still need headroom away from the rails. Its output also cannot swing to the supply rails, often being a couple of volts away from either rail. All of this makes the 741 ill-suited for low-voltage, single-supply circuits where signals swing around ground.

The LM358 is designed for single-supply operation and can handle input voltages that include ground. Its input common-mode range extends down to the negative rail, and the output can swing close to ground (within tens of millivolts under light loads), making it very practical for battery-powered and low-cost circuits. It can run from a wide single supply (roughly 3 to 32 volts), which is a big contrast to the 741’s dual-supply requirement.

So the described traits—dual supplies and limited input range near ground for the 741, versus single-supply capability, ground-inclusive input range, and near-ground output for the 358—make the first option the best fit. The other statements misstate rail-to-rail capabilities or supply requirements for these parts.