Rohm Semiconductor LM358WPT

LM358WPT Product Summary and Introduction

The LM358WPT from Rohm Semiconductor is a general purpose dual operational amplifier housed in an 8-TSSOP package. Engineered as part of Rohm’s LM358xxx series, LM358WPT offers two independent op-amp circuits designed for applications requiring ground sense capabilities, robust operating voltage ranges, and low power consumption. As a silicon monolithic integrated circuit, it is suited for signal processing roles such as amplification, buffering, filtering, and current sensing—critical in consumer electronics, industrial controllers, and instrumentation. The LM358WPT’s ground-sense architecture and capability to operate from a single supply simplify design for systems constrained by limited power rails or requiring direct ground-level input/output referencing.

LM358WPT Series Family Overview and Model Comparison

The LM358xxx series, including the LM358WPT, features dual-channel devices with ground-sense input/output, while related series such as LM324xxx and LM2902xxx expand the offering to quad-channel amplifiers. Notably, the LM358xxx and LM2904xxx lines share many functional traits, differing primarily in operation temperature range, package availability, and intended reliability profiles. LM358WPT’s packaging—8-TSSOP—supports compact layouts and automated surface-mount assembly, facilitating integration into dense PCB environments. Engineers should carefully assess the series family, as relevant alternatives for higher channel count or wider temperature range may be found within LM324xxx or LM2902xxx products.

LM358WPT Electrical Specifications and Performance Details

The LM358WPT offers several notable electrical properties critical for precision analog design. It operates on a wide supply voltage range, from 3V to 32V (single supply), providing flexibility for both 5V and 12V based systems. Input bias current is typically 20nA, ensuring minimal signal loading. The device supports input/output ground sense, facilitating accurate low-level signal amplification. Key metrics include high large signal voltage gain, wide input common-mode voltage range (essential for proper amplification across varied input levels), and robust common-mode and power supply rejection ratios, all instrumental for maintaining signal integrity in noisy or variable supply environments. Furthermore, the LM358WPT is constructed without internal protection against radioactive rays and is intended for standard commercial and industrial use.

LM358WPT Typical Performance Graphs

Rohm Semiconductor provides detailed characterization of LM358WPT’s electrical behaviour over supply voltage and temperature ranges. Typical curves illustrate how supply current, output voltage swing, output source/sink current, input bias and offset voltage, slew rate, gain bandwidth, phase margin, and noise voltage respond to variations in environmental and electrical conditions. For example, output swing and gain remain stable through the stated temperature range of -40°C to +85°C, while input bias and offset voltages show predictable drift with both supply voltage and ambient temperature. Engineers can directly reference these curves to anticipate performance under real-world operating scenarios, supporting accurate design margins and diagnostic troubleshooting.

LM358WPT Package Type, Pin Layout, and Physical Size

LM358WPT is provided in a compact 8-TSSOP package, suitable for surface-mount PCB processes and optimal for equipment where board space is a premium. The pinout comprises two op-amp circuits, with inputs and outputs arranged for minimal crosstalk and straightforward routing. Pin configuration details are clearly outlined to prevent functional errors during schematic capture and PCB layout. Physical dimensions and tape/reel specifications are also supplied for automated pick-and-place production.

LM358WPT Application Recommendations and Practical Implementation

Application scenarios for LM358WPT include current sense amplifiers, voltage buffers, active filters, and general signal conditioning circuits. Practical guidance includes recommendations for handling unused op-amp channels—such as tying the non-inverting input within the defined common-mode voltage range and configuring inputs to prevent unpredictable behaviour. Input voltages must remain within defined ranges to ensure normal operation and prevent device degradation. LM358WPT supports both single and dual supply operation, with circuit techniques applicable for split-rail and ground-referenced systems. Engineering use-cases in voltage follower, inverting, and non-inverting amplifier topologies are detailed, along with the corresponding gain and impedance equations for straightforward design validation.

LM358WPT Power Consumption and Thermal Solutions

Effective thermal management is critical for preserving LM358WPT reliability and performance. Rohm specifies power dissipation based on mounting to a standard FR4 glass epoxy board of 70mm x 70mm x 1.6mm with limited copper area. Power consumption must be derated above 25°C ambient, following provided thermal resistance figures. LM358WPT’s junction temperature limits dictate design constraints for high ambient environments, and package thermal impedance guides layout decisions for improved heat transfer. Appropriate consideration for heat dissipation, including increased copper area or airflow, enhances device longevity, particularly in systems operating near maximum specified loads.

LM358WPT Operational Guidelines and Reliable Design Tips

Rohm’s operational notes for LM358WPT concentrate on real-world reliability measures expected in professional design. Key points include:

Protecting against reverse power supply polarity with external diodes

Using low-impedance power and ground traces to minimize voltage fluctuations

Isolating analog and digital ground planes to suppress cross-domain noise

Avoiding exposure of pins to voltages below ground or above supply rails, preventing activation of intrinsic device parasitics

Mitigating static discharge risks during handling and board assembly

Managing power supply inrush currents at startup

Carefully routing and sizing ground traces for small-signal integrity

The notes also warn against physical stress, excessive capacitive loading at the outputs, and highlight considerations for operation under strong electromagnetic fields. Careful attention to mounting orientation, inter-pin shorts in assembly, and parasitic behaviour ensures robust real-world performance.

LM358WPT Possible Alternative and Substitute Models

Selecting an alternative or replacement for LM358WPT within Rohm’s offering is straightforward. The LM2904xxx series shares many functional attributes and is suitable for operation in higher temperature (up to +125°C) environments. For applications requiring more than two op-amp channels, the LM324xxx and LM2902xxx series provide quad-channel solutions in diverse packages. When evaluating equivalent models, engineers should match supply voltage range, input bias currents, output swing, and temperature suitability to system requirements. Cross-series compatibility within Rohm’s portfolio simplifies sourcing for tightly specified analog designs, mitigating supply chain risks and offering flexibility in multitiered design ecosystems.

Conclusion

The LM358WPT dual operational amplifier from Rohm Semiconductor stands out as a versatile, robust, and thoroughly characterized device suitable for a wide array of analog signal processing needs. Its ground-sense, single-supply operability, broad electrical envelopes, and practical packaging make it an optimal choice for engineers and procurement professionals seeking reliable performance for consumer, industrial, and instrumentation designs. Comprehensive documentation, performance characterizations, and detailed application guidance enable informed selection, integration, and long-term reliability planning, making LM358WPT a central option in the general purpose amplifier market.