STMicroelectronics LM358APT

Summary of the LM358APT Dual Operational Amplifier

The LM358APT by STMicroelectronics is a widely utilized, general-purpose dual operational amplifier (op amp) that integrates two independent, high-gain amplifiers in a single 8-pin TSSOP package. Designed for enhanced versatility, the LM358APT supports operation from a single or dual power supply, accommodating a broad supply voltage range. Its low power consumption and industry-standard pinout make it an attractive choice for a range of analog signal conditioning applications in automotive, industrial, and consumer electronics. The amplifier’s robust internal frequency compensation and stable operation are particularly valuable for engineers targeting cost-sensitive and space-constrained designs.

Main Advantages of the LM358APT

At the core of the LM358APT’s appeal is its well-balanced feature set, which satisfies both performance and efficiency needs in analog design. These include:

Internal frequency compensation for simplified phase stability and reduced external component count.

High DC voltage gain (100 dB typical), facilitating effective signal amplification across various applications.

Wide bandwidth (1.1 MHz at unity gain, temperature-compensated), suitable for many general-purpose roles.

Low input bias current (20 nA, temperature-compensated) and low input offset voltage (2 mV typical), enhancing accuracy in precision circuits.

Low input offset current (2 nA), further supporting precise signal processing requirements.

Input common-mode voltage range includes the negative rail, allowing operation with input signals that include ground, which is valuable in single-supply configurations.

Differential input voltage range equal to the supply voltage, expanding input signal compatibility.

Large output voltage swing, from 0V to (Vcc+ – 1.5V), facilitating maximum output range when powered from a low-voltage supply.

These characteristics collectively enable the LM358APT to integrate seamlessly within single-supply systems, such as those running on standard 5V logic power, while maintaining interface compatibility and no requirement for additional rails.

LM358APT Absolute Limits and Preferred Usage Parameters

Proper application of the LM358APT begins with understanding its absolute maximum ratings and operational recommendations:

The device’s supply voltage can be varied between 3V and 32V (or ±1.5V to ±16V for dual supplies).

Output short circuits to Vcc should be avoided when Vcc exceeds 15V, and output current is limited to approximately 40 mA per channel to protect against thermal overstress.

Input voltages should not be driven below ground by more than 0.3V to avoid undesired parasitic effects.

Ambient operating temperature extends from -40°C to +125°C, which addresses a wide range of operating environments.

Adhering to these limits ensures device longevity and reliability, even in demanding industrial or automotive settings.

Electrical Specifications of the LM358APT

In the context of real-world engineering, the LM358APT delivers consistently reliable electrical performance:

The amplifier provides temperature-compensated behaviors for key parameters, ensuring reliable operation across thermal environments.

Supply current per amplifier remains nearly independent of the supply voltage, contributing to predictably low power consumption.

The unity-gain bandwidth of 1.1 MHz, with a typical slew rate, is suitable for filtering, buffering, and amplification tasks at low to moderate frequencies.

Output drive capabilities support sourcing and sinking of load currents while maintaining linearity close to ground, important for single-supply sensors or data acquisition modules.

The part displays good power supply rejection (PSRR) and common-mode rejection ratio (CMRR), key for rejecting unwanted noise and improving measurement integrity.

These parameters are validated across electrical characteristic curves such as open-loop gain versus frequency, output voltage range under load, input bias currents, and others, giving engineers a comprehensive perspective for simulation or design estimation.

Available LM358APT Packaging Types

The LM358APT is provided in an 8-TSSOP (Thin Shrink Small Outline Package) as standard, supporting compact board layouts and compatibility with automatic surface-mount assembly. This package also offers favorable thermal performance given the amplifier’s low quiescent dissipation, and aligns with environmental standards, as STMicroelectronics supplies ECOPACK®-rated devices for enhanced sustainability and RoHS compliance.

For comparable dual op amps across the LMx58 series, other options such as SO8, MiniSO8, and DFN8 2x2 are available, providing design flexibility for footprint matching, mechanical constraints, or specific compliance requirements.

Common Uses of the LM358APT in Contemporary Electronic Circuits

The design versatility of the LM358APT makes it suitable for a variety of analog application scenarios, including:

Non-inverting DC amplifiers with stable gain in signal conditioning pathways.

AC-coupled amplifiers and active filters for audio or sensor signal processing.

Precision differential and summing amplifiers, leveraging high input impedance and low offset characteristics.

Adjustable-gain instrumentation amplifiers for low-level measurement interfaces.

Peak detectors with low drift, supporting timing and control circuits.

Engineers can thus employ the LM358APT in transducer output conditioning, DC gain blocks, comparator circuits, and sensor interfaces—especially where single-supply power and rail-to-rail swing are implementation requirements.

Possible Alternative or Substitute Models for the LM358APT

When considering form, fit, or function alternatives to the LM358APT, the following models may be assessed:

LM158, LM258, LM358, LM158A, LM258A, LM358A: These models (from the same STMicroelectronics family) offer similar electrical specifications but may differ in parameters such as automotive qualification, extended temperature range, or package type.

LM158W: This variant provides enhanced ESD ratings for environments with stricter robustness demands.

LM2904 and LM2904W: Automotive-grade counterparts, offering requisite reliability screening and certifications for vehicle implementations.

When evaluating substitutes, engineers should consider requirements for ESD performance, specific package preferences, and the need for automotive or industrial qualification.

Conclusion

The LM358APT by STMicroelectronics strikes an optimal balance between classic analog performance and modern integration needs, offering stable dual op amp functionality within a compact and power-efficient 8-TSSOP package. Its wide supply range, robust internal compensation, adequate bandwidth, and extended input/output support equip engineers with a reliable platform for signal amplification and conditioning across industries. In contexts requiring high reliability, flexibility, and broad application compatibility, the LM358APT remains a time-tested choice that simplifies analog circuit design while allowing for straightforward qualification of equivalents or replacements when needed.